unit 2b –mollusca-fish · phylum: mollusca umost are marine (some are freshwater or terrestrial)...
TRANSCRIPT
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Unit 2b – Mollusca- Fish
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Cladogram of animals
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Several Evolutionary Events:Eumetazoa (Tisssues)Bilateria (Bilateral Organisms)Deuterostomia (Blastopore becomes Anus).Lophotrochozoa (Lophophorate Phyla and Trochophore Larva)Ecydscozoa (Goes through ecdysis).
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Phylum: Molluscau Most are marine (some are
freshwater or terrestrial)u Most are protected by a shell
(calcium carbonate)u Most contain a radulau Most have an OPEN
circulatory system.
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Basic Body Parts of the HAM: 1) _____________2)______________3)______________4)______________
Foot
Mantle
Visceral MassRadula
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Phylum Mollusca• Class: Monoplacophora (Neopilina)• Class: ______________ (Chitons)• Class: Gastropoda (Snails, Slugs)• Class: _______________ (Tooth or
Tusk Shells)• Class: Bivalvia (Clams, Mussels,
Oysters, scallops)• Class: _______________ (Squids,
Octopuses)
Polyplacophora
Cephalopoda
Scaphopoda
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Class: Monoplacophora• Single shelled• Segmented• Deep Marine• Reduced head• Foot for locomotion• Radula present
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Class: ___________
• Marine• Shell with eight
overlapping plates
• Foot used for locomotion
• Head reduced• Radula present
Polyplacophora
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Class: Gastropoda
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Class: Gastropoda• Marine, Freshwater,
and Terrestrial• Asymmetrical due to
_________• Shell coiled
(reduced or absent in some)– (dextral vs. sinistral)
• Foot for locomotion• Radula present
Torsion
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Class: Scaphopoda• Benthic marine• Filter feeders• Foot used to
burrow into sand
• _________ used to move food to gizzard
Radula
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Class: Bivalvia• Marine and
Freshwater• Flattened shell with
two valves• Head reduced• Filter feeders
(siphons)• No _________radula
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Class: Cephalopoda• All Marine• Head surrounded
by tentacles• Shell external,
internal or absent• Mouth with radula• Locomotion by
siphon (made from mantle)
• ________ Circulatory System
Closed
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Phylum: Annelida
• Repeated Segments• Specialized Segments• Connections
Giant Gippsland Earthworm, Australia
Average 6 feet! (up to 15!)
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Classification
• Class: ______________– (Earthworms)
• Class: Polychaeta– (Marine worms)
• Class: Hirudinea– (Leeches)
Oligochaeta
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Class: Oligochaeta
• Reduced head• No _________• A few setae per
segment
Parapodia
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Class: Polychaeta• Well developed
head• Parapodia with
setae• Tube-dwelling and
free-living
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Class: Hirudinea• Body usually
flattened• Reduced segments
and coelom• Setae absent• Suckers at both
ends• Parasites, predators
and scavengers
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Animal Circulation and Gas Exchange
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Circulation In Animals• __________ Circulatory Systems
– Arthropoda, Mollusca– Hemolymph (no blood or interstitial
fluid)• __________ Circulatory Systems
– mollusca, nematoda, annelida, vertebrates
– blood– interstitial fluid
Open
Closed
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Cells
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Cardiovascular System
• Heart– atria &
ventricles• Arteries• Arterioles• Capillaries• Venules• Veins
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Phylum: ______________• Walking worm• Was thought
to be link between annelids and arthropods
• Unjointedappendages but segmented
Onychophora
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Phylum: Arthropoda• Hard exoskeleton,
segmented• Segments carry paired
appendages• Open circulatory
system• Nervous system similar
to annelids• Contains 80% of all
identified species (Currently about 1 million species)
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Arthropod Diversity
• Versatile exoskeleton• Segmentation and appendages• Tracheae• Highly developed sense organs• Complex behavior patterns• _____________Metamorphosis
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Arthropod Classification
• Subphylum: Trilobita• Subphylum: Cheliceraformes
– Class: Merostomata (Horseshoe crabs)
– Class: Pycnogonida (Sea Spiders)– Class: ____________ (Scorpions,
Spiders, Ticks, Mites)Arachnida
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Arthropod Classification• Subphylum: Crustacea
– Class: Crustacea (Lobster, Crabs, Shrimp)
• Subphylum: Myriapoda (Uniramia)– Class: Chilopoda (Centipedes)– Class: Diplopoda (Millipedes)
• Subphylum: Hexapoda– Class: Insecta (Insects)
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Subphylum: ________• All extinct
(Permian era - 250 mya)
• Segmented without specialization
• Paired appendages
Trilobita
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Subphylum: Cheliceraformes
• Six pairs of appendages– one pair of _____________– one pair of pedipalps (not in
horseshoe crabs)– four pair of walking legs
• No mandibles• No antennae
Chelicerae
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Class: Merostomata• _____ pairs of appendages
– one pair of chelicerae– five pair of walking legs
• Unchanged since the triassic period
• Shallow coastal waters• Larvae similar to trilobites
Six
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Class: Pyconogonida• Called Sea
spiders (not true spider)
• May have extra legs (duplicate segments)
• Polar oceans
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Class: Arachnida
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Class: Arachnida• Scorpions are the first terrestrial
invertebrates– pedipalps modified as pinchers– tail modified with stinger
• Ticks and Mites are parasitic• Spiders contain modified _________
– used as fangs to inject poison• produce silk used for webs, eggs,
escape, courtship
Chelicerae
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Subphylum: Crustacea
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Subphylum: Crustacea
• Contain two pair of __________• Each appendage is __________
(two main branches)• Mandibles• Body of two or three parts• Mostly marine
antennaebiramous
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Subphylum: Myriapoda
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Subphylum: Myriapoda (Uniramia)
• Contain one pair of antennae• Each appendage is __________
(one main branch)• Mandibles
uniramous
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Classes: Chilopoda & Diplopoda
• ____________– Centipedes– ____ pair of jointed
legs per segment– poison claws– predators
• ___________– Millipedes– ____ pair of jointed
legs per segment (fused)
– herbivores
1 2
Chilopoda Diplopoda
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Subphylum: HexapodaClass: Insecta
• Most diverse of all arthropods
• May have been the cause of angiosperm diversity
• Metamorphosis– complete– incomplete
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Fig. 33-37a
2 pairs of wings; front thickened elytra
Beetles
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Fig. 33-37b
1 pair of wings; back form knobs called halteres
Winged/less 2 pairs membrane wings; thin waist
Two pairs of wings, ½ have hard outer shell, sucking mouth parts
Bees, Wasps, & Ants
True Bug
Flies
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Fig. 33-37c
Two wings covered with scales
Two membranous wings; large compound eyes. Long abdomen
Butterflies & moths
Dragonflies & Damselflies
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Phylum: Echinodermata• ______________
– radial and indeterminate cleavage
– Enterocoelous– anus from
blastopore
Deuterostomes
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Phylum: Echinodermata• Secondary Radial
Symmetry• ______________
___________– Ambulacral groove– Madreporite
• All marine
Water Vascular System
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Water Vascular System• ___________• Stone Canal• Ring Canal• Radial Canal• Lateral Canal • Ampulla• Tube Feet
Madreporite
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Classification
• Class: Asteroidea (Seastars)• Class: Opiuroidea (Brittlestars)• Class: Echinoidea (Sea Urchins,
Sand Dollars)• Class: Crinoidea (Sea Lilies)• Class: Holothuroidea (Sea
Cucumbers)
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Class: Asteroidea• Five arms radiating
from a central disc• ______ ambulacral
groove• Madreporite on the
aboral side• Contain
pedicellariae and papulae
Open
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Class: Ophiuroidea• Five thin arms
radiating from a central disc
• ______ ambulacral grooves
• Madreporite on the oral side
• No suckers on tube feet, pedicellariae or papulae
Closed
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Class: Echinoidea
• No arms but have five rows of tube feets
• Contain spines• Closed ambulacral
grooves• Madreporite on the
_______ side• Contain pedicellariae
and ________• Aristotle�s lantern
aboral
Papulae
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Class: Crinoidea• Attached to
substrate with many branched arms
• Open ambulacral grooves
• No __________• No pedicellariae or
papulae
Madreporite
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Class: Holothuroidea
• Soft bodied• Ambulacral areas
with tube feet• ________
Madreporite• No pedicellariae
or papulae• Closed ambulacral
grooves
Internal