chromosomes of australian lygosomine skinks (lacertilia:...
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223 Genrtic~a 83: 223-234, 1991, 0 I99 1 K~IIIW Acadwic Publishm. Prinled in the Netherlands.
Chromosomes of Australian lygosomine skinks (Lacertilia: Scincidae) II. The genus Lampropholis
S. C. Donnellan
School of Biological Sciences, Macquarie University, New South Wales 2113, Australia Present adress: Evolutionary Biology Unit, South Australian Museum, Adelaide, South Australia 5000, Australia
Received 28 June 1990 Accepted in revised form 11 December 1990
Abstract
Standard and C-banded karyotypes of 101 specimens of the skink genus Lampropholis, including all but one of the
10 described species, were examined to assess the value of karyotypic data for resolving current systematic problems with Lampropholis. Diploid chromosome numbers were mostly 30 except for two forms with 28 chromosomes due
to a reduction in the number of microchromosomes. The majority of interspecific chromosome changes were due to pericentric rearrangements. Apart from karyotypes referable to the described species, four distinct karyomorphs
were found. Individuals possessing these karyomorphs could not be readily assigned to any of the described species.
Introduction
Greer (1979) divided the Australian members of the
scincid lizard subfamily Lygosominae into three
groups: the Egernia, Eugongylus and Sphenomorphus groups. Lampropholis Fitzinger, a genus included in
the Eugongylus group, has had a chequered systematic history. The genus typifies the ‘intractable small
brown skinks’ that have troubled systematists since
Boulenger’s time late last century. Greer (1974) ressur- ected Lampropholis from the synonymy of Leiolopisma Dumeril and Bibron to accomodate the type species L.
guichenoti (Dumeril and Bibron) and three other
species previously residing in Leiolopisma: L. challeng- eri (Boulenger), L. delicata (De Vis) and L. mustelina
(O’Shaughnessy). A further six species have been described recently (Greer & Kluge, 1980; Ingram &
Rawlinson, 1981), but documentation of species di- versity is still inadequate with several forms awaiting
taxonomic appraisal (Mather, 1990). The relationships of the species constituting Lam-
propholis remain unresolved. Greer and Kluge (1980) recognised the challengeri and delicata groups within Lampropholis. Subesquently Ingram and Rawlinson
(1981) were unable to assign with certainty L. caligula to either group.
The lack of resolution in systematics of Lampro-
pho/is is due in part to the paucity of phylogenetically informative morphological characters. Karyotypic
analyses have been found to be useful in reptiles for
delineating species and for interpreting relationships at higher taxonomic levels (Gorman, 1973; King &
King, 1975; Bickham, 1983; King, 1983a). The present study was undertaken to assess the value of karyotypic
data for investigating the systematics of Lampropholis.
Materials and methods
Table 1 lists the 101 specimens of Lampropholis
studied, their geographic origins, and the chromo- some analysis applied to each. Of the 10 described
species, only L. tetradactyla was unavailable for study. Specimens were deposited with the Australian,
Queensland and South Australian Museums or re-
tained by the original collectors as listed in Appendix 1.
Karyotypes were prepared from heart and lung fibroblasts cultured in Hams FlO medium supple-
mented with 20% foetal calf serum. Heart and lung tissue was explanted onto coverslips in Leighton tubes. Outgrowths of fibroblasts derived from tissue
224
Table I. Specimens of Lampropholis examined. S= Standard karyotype. C= C-band karyotype, Qld = Queensland, N.S.W. =New South Wales. Superscripts l-7 indicate the presence of
chromosomal variants as follows I: 2 individuals heterozygous for
pericentric rearrangements of pair 8 (het.peri.8). 2: 1 individual heterozygous for heterochromatin addition (het. add.) to pair 9
and I heterozygote for het.peri.8. 3: I heterozygote for Robertso- nian rearrangement of pair I or 2 and I heterozygote for het. add.
to 9.41 I heterozygote for het. add. to 9 and IO. 5: I homozygote for peri. 8. I heterozygote for het. add. to 9. 6: I heterozygote for het.
peri. 6. 7: I het.peri. 6.
Species Male Fe- Locality male
s cs c
L.amicuia I -
1 -
L. basiliscus I I 1 I
L. caligula - 1 I
L.challengeri I I 1 I I 1 I
I I -
I - I I
I I I
L.czechurai 2 I -
I -
L.delicata 2 2
I
I I I I I
I I -
I 2’
I -
2 I 1:
I I - 2 3’
I - 2 - I -
I 2 24
I - 3 2 2 2’ 3 -
Ih I I I I’
2 - 1 I I
2 -
Mogill S.F., Qld.
Rainbow Beach., Qld.
Charmillan Ck., Qld.
Barrington Tops, N.S.W.
Randwick, N.S.W. Neutral Bay, N.S.W. Bellevue Hill, N.S.W.
near Brinerville. N.S.W.
Mt. Warning, N.S.W. Alstonville, N.S.W.
Mt. Glorious, Qld.
Charmillan Ck., Qld.
Millaa, Millaa, Qld.
Lauceston, Tasmania
Marble Range, S.A.
near Port Lincoln, S.A. 25km N. Avenue, S.A. Eltham, Victoria
Bondi S.F., N.S.W. near Nowra, N.S.W.
Coogee, N.S.W.
Pymble, N.S.W. Neutral Bay, N.S.W. Watagan S.F., N.S.W.
Doyalson, N.S.W. Myall Lakes, N.S.W. Werrikimbe N.P., N.S.W.
Carrai S.F., N.S.W. near Brinerville, N.S.W. Cambridge Plateau. N.S.W.
Wiangarie SF., N.S.W. Scarborough, Qld. Connondale Range, Qld.
Bunya Mtns., Qld. Granite Ck., Qld. Rockhampton. Qld. Byfield, Qld. Mt. Morgan, Qld.
Species Male Fe- Locality male
s cs c
L.guichenoti - I near Glare, S.A.
1 I 2 2 Pymble, N.S.W.
L.mirabilis - I Cape Cleveland, Qld.
L.mustelina - I Greenwich, N.S.W. 1 Bellevue Hill, N.S.W.
I I - Wentworth Falls. N.S.W. I near Barry, N.S.W.
L.sp. A I Kuranda, Qld.
5 I - Charmillan Ck.. Qld.
L. sp. B I 3 Mt. Bartle Frere, Qld.
L. sp. c 2 - Connondale Range, Qld. 2 - Granite Ck., Qld.
I - Bulburin S.F., Qld. 3 3 I I Crediton Ck., Qld.
L. sp. D I I I I Mt. Glorious, Qld. I 2 Mt. Nebo, Qld.
pieces were harvested in situ on the coverslips. Three
replicate cultures were initiated on each specimen. Cultures of most species grew adequately at 3O”C,
except those of L. challengeri, L. basiliscus and L. czechurai which grew successfully only at 24°C.
Meiotic preparations were made following the technique of Gorman et al. (1967), excepting that
hypotonic treatment was for 25 minutes in 0.53% KCl. Cells were harvested according to the procedure of
Donnellan (1990). Preparations were stained with
10% Giemsa for two minutes. The C-banding method of Sumner (1972) was employed.
Results
Diploid numbers were either 30 or 28 (Table 2) with
nine macrochromosome pairs @airs one-nine) and either five or six pairs of microchromosomes. One individual of L. delicata had 29 chromosomes due to a Robertsonian rearrangement among the macrochro- mosomes (see below). With the exception of this individual the six largest pairs of chromosomes were
invariant with the first five being metacentric and the
Table 2. Summary of karyotypic variation in Lampropholis. Only the chromosome pairs showing variation are presented. M: metacentric, SM: submetacentric. A: acrocentric, T: telocentric.
Chromosome pair
basiliscus an~icula caligula challengeri czrchurai delicata pichenoti tnirabilis mustelina sp. A sp. B sp. C sp. D
sixth submetacentric. Variation was confined to the remaining chromosomes (Table 2) and is detailed along with the C-banding pattern of the whole karyotype in the individual accounts which follow. For comparative purposes the karyotype of each species is compared to that of L. basiliscus (Fig. l), which has the karyotype with the commonest mor- phology for the variable chromosome pairs.
In addition to the karyotypes of the described species of Lampropholis, populations with four distinct karyomorphs were found. Individuals with these
distinct karyotypes could not be assigned readily to any described species and herein are assigned pro- visionally to the taxa Lampropholis sp. A to D.
Lampropholis basiliscus Ingram and Rawlinson. 2n=30 Pairs six and seven were submetacentric, pair eight acrocentric, and pair nine and the largest pair of microchromosomes were telocentric (Fig. 1). The remaining pairs of microchromosomes were either acrocentric or telocentric. The fourth pair of macro- chromosomes and two pairs of microchromosomes had prominent, centromeric C-bands (Fig. 5a). There were 'grey' telomeric C-bands on the long arm of one of the two largest macrochromosomes.
Lampropholis amicula Ingram and Rawlinson. 2n=30 The standard karyotype of L. amicula differed from that of L. basiliscus in having an acrocentric pair seven, metacentric pairs nine and ten, and in the largest microchromosome pair being metacentric (Fig. 2a). There was insufficient material for C-banding.
Lampropholis caligula Ingram and Rawlinson. 2n=30 The standard karyotype can be distinguished from that of L. basilicus by the telocentric pair eight and by the largest microchromosome pair being metacentric (Fig. 2b). C-bands (not illustrated), were minimal and confined to the centromeres.
Lampropholis challengeri ( Boulenger). 2n=30 The karyotype differed from that of L. basiliscus by having an acrocentric pair nine (Fig. 2c). Centromeric C-bands were minimal but telomeric C-bands were present on all members of the complement (Fig. 5b).
Lampropholis czechurai Ingram and Rawlinson. 2n=30 In three male specimens from two localities, pair seven was heterozygous for a pericentric rearrangement (Fig. 2d). Apart from pair seven, this species differed from L. basiliscus in having an acrocentric pair nine. There were prominent centromeric C-bands in this species (Fig. 5c). The first four pairs had telomeric C-bands. C-bands on the heteromorphic seven pair were confined to the centromere and appeared tq be equal in intensity.
Fig. I . Standard karyotype of female Lampropholis basiliscus from Charpillan Ck.. Queensland (Qld) The bar indicates IOfim.
226
Fig. 2. Partial standard karyotype of some Lampropholis. (a) male L. amicula from Mogill State Forest (S.F.) Qld.; - (b) female L. ca/&y/a from
Barrington Tops, New South Wales (N.S.W.): - (c) female L. challfngeri from Neutral Bay, N.S.W.; - (d) male L. czrchurai from Charmillan Ck.. Qld.; - (c) female L. Micara from Watagan S.F., N.S.W.; -(f) female L. guichenoti from Pymble, N.S.W.; - (g) female L. mirahilis from Cape Cleveland. Qld.; - (h) female L. mustrlina from Greenwich, N.S.W. The bar indicates IOpm.
227
Fis. 3. PwM. ~.at&.rd k.aqW.ypevaf ~wcw Lampraphdi.. (3 c 2 m.ak L. c+, A ham. KurcW.k,QM..;- (b) A. few.dt L.. s+. B fvxv. bf.t.. &.P.% Fqplrp_,
Qld.; (c) male L. sp. C from Bulburin S.F.. Qld. Note the heteromorphic pair of microchromosomes; -(d) female L. sp. C from Crediton Ck.,
Qld. Note absence of heteromorphism amongst the microchromosomes; - (e) male L. sp. D from Mt. Nebo, Qld. The bar indicates IOpm.
Lampropholis delicata (De Vis). 2n=28
The taxonomic status of L. delicata has recently been stabilised by Mather (1990) with the nomination of a
neotype. However, the species still lacks a description adequate for identification purposes. Mather (1990)
also found three other electrophoretically distinct
forms which occur within the geographic range of L. delicata, which he named Forms B, C and D. These
forms had restricted ranges, all within Queensland.
Thus of the four forms which Mather (1990) identified, the specific expithet delicata is applied to the more
geographically widespread of these species (for ex- ample Cogger, 1983).
The standard karyotype differed from that of L. basiliscus in the diploid number and in that pair eight
was usually telocentric (Fig. 2e). The five pairs of microchromosomes were either telocentric or acro-
centric. In general, centromeric C-banding was mi-
nimal and telomeric C-bands were present on the
larger macrochromosomes and distally on pair nine (Fig. 5d).
Ten individuals from the central part of the species’ range were heterozygous for a variety of rearrange-
ments (Table 1). One specimen was heterozygous for a
Robertsonian rearrangement involving one of the two largest pairs of macrochromosomes (Fig. 4a). Two
individuals from different locations were heterozy-
gous for a pericentric rearrangement of pair six (Fig.
4b). Three specimens from two localities were hetero- zygous for a pericentric rearrangement of pair eight (Fig. 4c), while a fourth from a third locality was homozygous for the variant chromosome. In both of
the latter mentioned rearrangements C-bands were confined to the centromeres of these pairs.
228
d5
6 7
6 7
6 7
4
8 9
8 9
Fig. 4. Partial karyotypes of Lampropholis delicata showing
structural heteromorphisms. (a) male from Watagan S.F., N.S.W. heterozygous for a Robertsonian rearrangement of one of the two
larger pairs of macrochromosomes; - (b) female from Connondale
Range. Qld. heterozygous for a pericentric rearrangement of pair six; - (c) male from near Nowra, N.S.W. heterozygous for a pericentric rearrangement of pair eight; -(d) female from Wianga-
rie S.F., N.S.W. with a short arm on one member of the usually
telocentric pair nine. C-banding (lower pairs eight and nine) demonstrates that the additoinal material is heterochromatic. The
bar indicates 10pm.
There were no apparent differences in bivalent morphology at first prophase of meiosis between the
homozygotes and heterozygotes for the pericentric rearrangement of pair eight. The seven largest bi-
valents routinely showed more than one chiasma, while the remaining bivalents each displayed a single
chiasma. In the absence of significant centromeric C-band markers it was not possible to determine if there was any chiasma localization in either the homomorphic or heteromorphic bivalents. All stages
of meiosis observed in the homozygotes were present in the heterozygotes. As both of the heterozygotes for the pericentric rearrangement of pair six were females, meiotic analysis was precluded.
A further four specimens were heterozygous for the addition of a small short arm on pair nine (Fig. 4d).
One of these was also heterozygous for additional material on one of the larger microchromosomes. C-
banding indicated that the additional material in both cases was totally heterochromatic.
Lampropholis guichenoti (Dumeril and Bibron). 2n=30
The standard karyotype of this species was distin- guishable from that of L. basifiscus by an acrocentric
pair seven and by the metacentric nature of pair nine
and the largest pair of microchromosomes (Fig. 2f).
This karyotype is generally similar to that reported by King (1973) for animals collected near Jenolan Caves, N.S.W.. Centromeric C-bands were prominent in this
species (Fig. 5e). Both specimens C-banded were
heterozygous for proximal C-bands on the fifth pair and the intensity of this band varied between in-
dividuals. Prominent ‘grey’ C-bands were seen ter- minally on the long arm of the second largest pair of
macrochromosomes. The seventh pair had a fine
distal C-band on the long arm.
Lampropholis micrabilis Ingram andRawlinson. 2n=30 The karyotype differed from that of L. basilicus by
having a telocentric pair eight and a submetacentric pair nine (Fig 2g). There was insufficient material for
C-banding.
Lampropholis mustelina (O’Shaughnessy). 2n=30 The karyotype of this species differed from that of L.
basiliscus by the largest pair of microchromosomes
being metacentric (Fig. 2h). Centromeric C-bands were minimal except for the largest pair of chromo-
some pair nine.
Lampropholis sp. A. 2n=30 The standard karyotype can be distinguished from
that of L. basiliscus by the telocentric pairs seven and
eight and the submetacentric pair nine (Fig. 3a). The specimen C-banded had prominent centromeric C- bands and fine proximal bands either side of the centromere on two pairs of the larger macrochro- mosomes (Fig. 6a). There were prominent proximal
C-bands on the telocentric pairs seven and eight.
Lampropholis sp. B. 2n=30 The standard karyotype differed from that of L. basiliscus in that the seventh and tenth pairs were
229
Fig. 5. C-band karyotypes otsome Lampropholis. (a)female L. basiliscus from Charmillan Ck., Qld.; - (b) male L. challengerifrom Randwick, N.S.W.: - (c) male L. czechurui from Charmillan Ck., Qld.; -(d) male L. delicata from Bondi S.F., N.S.W.; - (e) female L. guichenoti from Pymble, N.S.W. Note the interstitial C-band on pair five; - (f) male L. musrelina from Wentworth Falls, N.S.W. The bar indicates 10pm.
Fig. 6. C-band karyotypes ofsome Lampropholis. (a) male L. sp. A from Charmillan Ck, Qld.; - (b)a male L. sp. C from Crediton Ck, Qld. Note the heterochromatic nature of larger element of the heteromorphic microchromosome pair; - (c) a female L. sp. C from Crediton Ck, Qld. Note the absence of a heteromorphic microchromosome pair; - (d) male L. sp. D from Mt. Glorious, Qld. The bar indicates 10pm.
acrocentric while the eight was telocentric (Fig. 3b). There was insufficient material for C-banding.
Lampropholis sp. C. 2n=30 The standard karyotype can be distinguished from that of L. basiliscus by the telocentric pairs seven and eight and the submetacentric pair nine (Fig. 3c, d). Six male specimens from three widely separate localities in central and southern Queensland displayed hetero- morphism in one of the two smaller pairs of micro- chromosomes. C-banding revealed that the larger telocentric element was entirely heterochromatic, while the heterochromatin of its presumed partner was
confined to the centromere (Fig. 6b). This hetero- morphism was absent from the only female examined (Fig. 6c), suggesting that it may be a sex chromosome pair but more specimens must be sampled before this can be confirmed. There were prominent centromeric C-bands on pairs six, seven, eight and on three pairs of microchromosomes. Fine proximal C-bands appear- ed on either side of the centromere on the two largest pairs of macrochromosomes.
Lampropholis sp. D. 2n=28 The standard karyotype differed that of L. basiliscus by the possession of telocentric pairs seven and eight
231
and a submetacentric pair nine (Fig. 3e). Centromeric C-bands were prominent on all pairs except the four
larger pairs of macrochromosomes. Three of the
largest pairs of macrochromosomes had fine proximal
C-bands either side of the centromere. There was a tine proximal C-band on the telocentric pair seven. A male specimen was heterozygous for the addition of a small
C-band to the distal end of a pair of microchromo- somes which also had a fine interstitial band on both
homologues (Fig. 6d).
Discussion
Karyotype evolution
Various types of karyotypic changes were observed in Lampropholis. Most karyotypic differences between
species can be accounted for by pericentric rearrange- ments. The most frequent types of karyotype re-
arrangement observed in vertebrates involve changes
in chromosome number due to fusion-fission events or changes in centromere position due to pericentric rearrangements. The former has certainly been the
predominant mode in geckos (King, 1983a) and
iguanids (German et al., 1967) while the latter is prevalent in varanids [King & King, 1975).
In two forms of Lampropholis, L. delicata and L. sp.
D the number of microchromosomes is reduced.
Reduction in the number of microchromosome pairs is commonly encountered in reptiles especially in the
iguanid genus Anolis (Gorman, 1973), some Gehyra (King, 1983a), chamaeleons and anguid lizards (Bick- ham, 1983). In some cases microchromosomes fuse
together to create new macrochromosomes or are
converted into macrochromosomes by addition of heterochromatin. Neither of these mechanisms has
operated in the case of Lampropholis. Instead in Lampropholis a microchromosome pair has been lost or translocated onto a larger macrochromosomal
pair. It is doubtful wether G-banding would help
decide between these two possibilities because of the small size of the element involved.
Heterochromatin has not played a major role in karyotypic differentiation between species oflampro- pholis being rather minimal in content and confined mainly to centromeric and telomeric areas. Where
additional heterochromatic blocks were observed, they occurred uniquely or as wide spread polymor-
phisms providing a further source of intraspecific
karyotypic variation. A further form of karyotype variation which ap-
pears widely but infrequently in lizards is the occurr- ence of heteromorphic sex chromosomes (reviewed in King, 1977). In L. czechurai and L. sp. C. the
observation of males from more than one locality with
a heteromorphic chromosome pair suggests that sex chromosomes have differentiated morphologically in
these forms. However, in the absence of adequate data for females this interpretation remains speculative
although highly suggestive. In support, the male is the
heterogametic sex in other skinks where hetero- morphic sex chromosomes occur (Wright, 1973; Har- dy, 1979). The involvement of two different chromo-
some pairs indicates two independent origins for morphologically differentiated sex chromosomes in
Lampropholis. The occurrence of heteromorphic sex
chromosomes in lygosomine skinks will be addressed more fully in a forthcoming paper.
Karyotypic variation in Lampropholis delicata
Various structural rearrangements contribute to the karyotypic variation observed in some populations of
L. delicata. The presence of individuals with unique rearrangements i.e. a Robertsonian rearrangement
involving a macrochromosome pair, suggests that
these are rare mutants rather than chromosomal polymorphisms. As sample sizes at most localities are
small there must be uncertainty about the frequency of such rearrangements. The wide spread geographic
distributions of the telocentric form of chromosome pairs six and eight are indicative of pericentric re-
arrangement polymorphisms. Where sufficient num- bers of individuals have been studied structural hete-
rozygosity has been observed in species from a number of lizard families (King, 1983a), but there is no
evidence for meiotic problems in individuals hetero- zygous for these types of rearrangements in lizards (King, 1983a; Porter & Sites, 1985).
232
Systematic implications
The most significant taxonomic implication of the
chromosome variation in Lampropholis, is the status of the four distinct chromosome forms (L.sp. A-D)
found among populations of L. delicata group ani-
mals. Three of these taxa had previously been found to be distinct on biochemical and morphological grounds
(Mather, 1990). Thus forms B, C and D of Mather (1990) are equivalent to L. sp. C, D and A respectively.
It should be appreciated that each unique karyo-
morph may not constitute a new species as the postulated chromosome rearrangements which dis- tinguish these karyomorphs may not constitute a
significant barrier to gene flow (Lande, 1979), although this remains untested in the present case. However,
numerous examples of chromosome races being even- tually recognised as species exist (e.g. King, 1982,
1983b; Storr, 1979).
L. delicata and L. sp. C appear to be distinct biological species. At Granite Ck., where two indi-
viduals of each karyomorph were collected in sym- patry, differences in morphology of pair 7 and in
diploid number were maintained as well as the presence of probably heteromorphic sex chromo-
somes in L. sp. C only. The null hypothesis under test is that the four individuals from this locality were
sampled at random from a single population which is therefore in Hardy-Weinberg equilibrium. The esti-
mated frequenceis of the submetacentric and telo- centric forms of pair seven are p=OS and q=OS.
Likewise the estimated frequencies of the two diploid
numbers is p=O.5 and q=O.5. The expected propor- tion of heterozygotes for either of these two characters is 2pq=O.5. The probability of not observing an
individual heterozygous for the rearrangement in pair
7 and/or with 29 chromosomes is [l-(2X0.5X0.5)]4‘*2 = 0.39% (Richardson et al., 1986). Thus a null hypothesis that the sample of four individuals was
drawn from a single random breeding population is not supported. An alternative hypothesis that the karyomorphs represent distinct biological species is also supported by the presence of fixed allelic differ-
ences at 20% of their loci (Mather, 1990). No further cases of sympatry occurred in the
samples of L. sp. A, B, C, D and L. delicata group
species studied here. Ultimately, a taxonomic decision
of the status of the four karyomorphs will depend on an integration of ecological and morphological data so that comparison with the appropriate species can be
made. Conversely karyotypic uniformity was observed in
three species (L. delicata, L. challenger-i, L. mustelina) in which taxonomic problems exist on morphological
grounds (G. Ingram, pers. comm.). For instance, L. delicata is a widely distributed species showing varia-
tion in body size, tail length, colouration and the
extent of sexual dichromatism. In this study, karyo- types of animals from 25 localities, covering a major part of the range, showed overall uniformity. Karyo-
types of specimens from the far north of the range around the Atherton Tableland remain to be ex-
amined. Taxonomic investigations of L. delicata, L.
challengeri and L. mustelina should be tackled further by a biochemical technique such as allozyme electro-
phoresis which could establish a genetic framework for the resolution of the taxonomic status of morpho-
logical variants. Phylogenetic interpretations based on these data
must await more information. Too little is known of the karyotypes of appropriate outgroup genera of
lygosomine skinks to test the monophyly and the intergeneric relationships of Lampropholis.
Acknowledgements
This study was made possible by the following people
who generously provided specimens: S. Burgin, H. Cogger, J. Covacevich, H. Ehmann, R. Green, A. Greer, M. Hutchinson, G. Johnston, M. Mahony, P.
Mather, R. Sadlier, and G. Webb. The fauna authori- ties of the States concerned are thanked for their
cooperation. S. Burgin, H. Ehmann, A. Greer, G. Ingram, and P. Mather generously shared their un-
published information. P. Baverstock, R. Close, A. Greer, P. Johnston, and G. Sharman reviewed the manuscript. Field work for this study was supported in part by an Australian Museum Postgraduate
Award.
233
References
Bickham. J. W., 1983. Patterns and modes of chromosomal
evolution in reptiles. In: A. K. Sharma and A. Sharma (eds), Chromosomes in evolution of eucaryotic groups. Vol. 2. CRC,
Boca Rouge Florida: 13-40. Cogger, H. G., 1983. Reptilesand Amphibians of Australia. A. H.
and A. W. Reed, Sydney. Covacevich, J., 1971. Amphibian and Reptile type-specimens in
the Queensland Museum. Mem. Qd Mus. 16: 49-67. Donnellan. S. C., 1991. Chromosomes of Australian Lygosomine
Skinks (Lacertilia: Scincidae). I. The Egernia group. Genetica (in press).
Gorman, G.C., 1973. The chromosomes of the Reptilia, a cytotaxonomic interpretation. In: A. B. Chiarelli and E. Capan-
na (eds), Cytotaxonomy and vertebrate evolution. Academic Press, New York: 349-424.
Gorman, G. C., Atkins, L. & Holzinger. T., 1967. New karyotypic data on fifteen genera of lizards in the family Iguanidae with a
discussion of taxonomic and cytological implications. Cyto- genetics 6: 286-299.
Greer, A. E., 1974. The generic relationships of the scincid lizard genus Leiolopisma and its relatives. Aust. J. Zool. Suppl. Ser.
31: l-67. Greer, A. E. & Kluge, A. G., 1980. A new speciesof Lampropholis
(Lacertilia: Scincidae) from the rainforests of north-eastern
Queensland. Oct. Pap. Mus. Zool. Uni. Michigan 691: I-12.
Hardy, G. S., 1979. The karyotypes of two scincid lizards, and their bearing on relationships in genus Leiolopisma and its relatives
(Scincidae: Lygosominae). N. Z. J. Zool. 6: 609-612. Ingram, G. & Rawlinson, P., 1981. Five new species of skinks
(genus Lampropholis) from Queensland and New South Wales.
Mem. Qld. Mus. 20: 31 I-317. King, M., 1973. Karyotypic studies of some Australian Scincidae
(Reptilia). Aust. J. Zool. 21: 21-32.
King, M., 1977. The evolution of sex chromosomes in lizards. In: J. H. Calaby and C. H. Tyndale-Biscoe (eds), Reproduction and evolution. Australian Academy of Science: Canberra: 55-60.
King, M., 1982. Karyotypic evolution in Gehyra (Gekkonidae: Reptilia). Il. A new species from Alligator Rivers region in
Northern Australia. Aust. J. Zool. 30: 93-101. King. M.. 1983a. Karyotypic evolution in Gehyra (Gekkonidae:
Reptilia). III. The Gehyra australis complex. Aust. J. Zool. 31: 723-74 I.
King, M.. 1983b. The Gehyra australis species complex (Sauria: Gekkonidae). Amphibia - Reptilia 41: 147-169.
King, M. & King. D., 1975. Chromosomal evolution in the lizard genus Varanus (Reptilia). Aust. J. Biol. Sci. 28: 89-108.
Lande. R., 1979. Effective deme sizes during long-term evolution estimated from rates of chromosomal rearrangement. Evolution
33: 234-25 I. Mathcr, P.. 1990. Electrophoreticand morphologicalcomparisons
of Lampropholis delicata (Lacertilia: Scincidae) populations from Eastern Australia, and a resolution ofthe taxonomic status of this species. Aust. J. Zoo]. 37: 561-74.
Porter. C. A. & Sites, J. W., 1985. Normal disjunction in Robert- sonian heterozygotes from a highly polymorphic lizard popula-
tion. Cytogenetics and Cell Biology 39: 250-257. Richardson. B. J., Baverstock. P. R.&Adams, M.. 1986. Allozyme
Electrophoresis. Academic Press, Sydney.
Storr, G. M., 1979. The Diplodactylus vittatus complex (Lacertilia,
Gekkonidae) in Western Australia. Rec. west. Aust. Mus. 7: 391-402.
Sumner, A.T., 1972. A simple technique for demonstrating
centromeric heterochromatin. Exp. Cell Res. 75: 304-306. Wright, J. W., 1973. Evolution of the XIX,Y sex chromosome
mechanism in the scincid lizard Scincella laterale (Say). Chro- mosoma 43: 101-108.
Appendix 1
Specimens of Lampropholis examined. N: number of specimens examined. Registration Number Prefixes: AMS R: Australian Museum, Sydney: QM J: Queensland Mu-
seum. Brisbane; SAMA R: South Australian Museum, Adelaide: HE: Harry Ehman collection; SB: Shelly Burgin collection; L:
Stephen Donnellan collection.
L. amicuh (2): Mogill S.F., Qld., 27”39’S., 150”52’E.. AMS
RI 11479. Rainbow Beach, Qld.. 25”55’S., 153”06’E., RI 11790. L. basihws (2): Charmillan Ck., Qld., 17”43’S., 145”3l’E., AMS
RI 1401 I-12. L. caligulu (I): Barrington Tops, N.S.W., 32”O?‘S., 151”28’E.. AMS RI 15279. L. challengeri (I 1): Randwick, N.S.W.. 33”55’S.. 151”15’E., LACHAl6-17. NeutralBay,N.S.W.,33”51’S.,
151”12’E., SB219. Bellevue Hill, N.S.W.. 33”5l’S., 151”15’E., LACHA22-23. near Brinerville. N.S.W.. 30”28’S.. 152”33’E., AMS
Rlll739.Mt. Warning.N.S.W..29°18’S.,153”16’E.,AMSR97821. Alstonville, N.S.W., 28’5O’S., 153’26’E.. HE2569, 2572. Mt.
Glorious. Qld., 27”2O’S., 152”45’E.. AMS R97818, SB362. L. czechurui (3): Charmillan Ck., Qld., 17”43’S., 145”3l’E.. AMS
RI l4009-010. Millaa Millaa,Qld.. 17031’S.. 145”37’E., QM 341356. L. c/ci;catu (50): Launceston,Tasmania, 41”27’S., 147”lO’E.. AMS
RI 15281-4. Marble Range, S.A., 34”26’S., 135”29’E., SAMA R297X5. near Port Lincoln, S.A., 34”42’S., 135”49’E., SAMA
R29786-7. 25km N. Avenue, S.A., 36”45’S, 140”1‘3’E, SAMA R35818-9. Eltham, Victoria, 37”43‘S., 145”09’E.. AMS RI 15278,
I 11609.. Bondi S.F., N.S.W., 37”08’S., 149”09’E., AMS RI 12353. near Nowrd. N.S.W.. 35’03’S.. 150”20’E., AMS Rl02759-61.
Coogce, N.S.W., 33”55’S., 151”15’E., AMS R104796. Pymble, N.S.W., 33”45’S.. 151”08’E., LADEL61, SB65. one specimen lost.
Neutral Bay, N.S.W., 33”5l’S., 151”12’E., LADEL62. Watagan SF., N.S.W.. 33”15’S., 151°20’E.. AMS R97827, 10478789,
LADEL27. Doyalson. N.S.W.. 33”13’S., 151”30’E., AMSR104203. Myall Lakes, N.S.W., 32”25’S., 152”30’E., LADEL7, 15. Werri-
kimbe N.P.. N.S.W., 31”09’S.. 152’14’E., AMS RI1 1470. Carrai S.F..N.S.W.. 3l”Ol’S.. 152”20’E.,AMSR112322. near Brinerville,
N.S.W., 30”28’S., 152”33’E., AMS R102763, 111787. Cambridge Plateau, N.S.W., 28”45’S., 152”45’E., AMS RII 1839. Wiangarie
SF., N.S.W., 29”08’S., 152”07’E.. AMS RI 11472, 785-6, 474, 115298. Scarborough, Qld., 27”12’S., 153”07’E., AMS Rl11837,
478, 480. Connondale Range, Qld., 26”33’S.. 152”35’E.. AMS Rl04196. Bunya Mtns.. Qld.,26”55’S., 151’37’E.. AMS Rll4097- 8. Granite Ck., Qld., 24”36’S., I5 1”4O’E., 545295-6. Rockhampton.
Qld., 23”22’S., 150”32’E.. AMS RI 11833. Byfield, Qld.. 22”5l’S.. 150”39’E., HE2373. Mt. Morgan, Qld.. 21”28’S., 150”22’E., AMS RI 15268-9. L. ,pichenoti (4): near Glare, S.A., 33”5O’S., 138”37’E., HE3334. Pymble, N.S.W., 33”45’S., 151°08’E., AMS Rl11574-5. SB64. 1.. mirabilis (I): Cape Cleveland, Qld., 19”l I’S, 147°01’E..
234
AMS Rll1828. L. mustelina (4): Greenwich, N.S.W., 33”5O’S., 17’24’S., 145”49’E., QM J4@333,40036-9. L. sp. C (8): Connondale
151”l l’E., AMS R96788. Bellevue Hill, N.S.W., 33”53’S., Range. Qld.. 26’33’S., 152”35’E., AMS Rl02778-9. Granite Ck.,
151”15’E., SB220. Wentworth Falls, N.S.W., 33O43’S., 150”22’E., Qld., 24”36’S., 151”40’E., QM 545297-8. Bulburin S.F., Qld., AMS R111784. near Barry, N.S.W., 31”35’S., 151”25’E., AMS 24”3O’S., 151”30’E., HE2373. Crediton Ck., Qld., 21”12’S.,
R102748. L. sp. A (6): Kuranda, Qld., 16”49’S., 145”38’E., QM 148”32’E., AMS R111825,829-30,834. L. sp. D (5): Mt. Glorious,
541360. Charmillan Ck., Qld., 17”43’S., 145”31’E., QM 541361-2, Qld., 27”2O’S., 152”45’E., AMS R111835,37. Mt. Nebo, Qld.,
AMS R94537, 538, 94545. L. sp. B (4): Mt. Bartle Frere, Qld., 27”24’S., 152”45’E., AMS R97875,77.