phylum arthropoda. arthropoda name means “joint” “foot” segmented coelomates with jointed...
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Phylum Arthropoda
Arthropoda• Name means “Joint” “foot”• segmented coelomates with jointed appendages • Exoskeletons of chitin• Ecdysis (Molting)• There are more known species of arthropods
than all other phyla combined.• Hemocoel (coelom only in embryo, then reduced
in growth) • Some fossils on land date back to before plants!!
Groups (4 Separate Phyla ??):• Trilobite (extinct)• Uniramia
– Centipedes– Millipedes– insects
• Chelicerata– Spiders– Horseshoe crabs– Scorpions
• Crustaceans
Chelicerata
– Spiders– Horseshoe crabs– Scorpioins
Arachnids: spiders, scorpions, ticks, mites, etc
• Body in just two sections – Combined cepahalothorax and abdomen
• 8 legs ( 4 segments to thorax)
• No antennae
• 1 pair of chlicera
Horseshoe Crabs
• Marine Chelicerate
Mandibulata
– Uniramia : Centipedes. Millipedes, Insects– Crustaceans
Fig. 21.34
Basic Body plan
• Head
• Thorax
• Abdomen
Crustacea
• Crabs, Lobsters, Shrimp, Barnacles, Crayfish
• Rollie-Pollie “pill bugs”
Crayfish anatomy
Male Female
HEART
Stomach
Manidibular muscles
Gills
Stomach
• Gastric Mill (teeth)
Green Glands
• ( Aorta) Dorsal Hemolymph Vessel - red
• Intestine (“vein” in restraunts) dark
Insecta
• Basic Arthropod features
• Malpighian tubules
• Trachea , spiracles
• Ovipositors
Fig. 21.27
Pronotum
cropgizzard
Gastric ceca
Nervous SystemGanglia # 46
Fig. 21.35
Pierce- Suck Siphoning Sponging
Trachea # 40
Tracheal system attached to muscle
Mouth parts# 41
Spiracles
Tympanum
Entomophagy (Yumm!!)
• Good source of protein
• Can be dried and powdered stores well
Orthoptera
• Grasshoppers, crickets
• 2 pair of wings
• 2 jumping legs
• Extended pronotum covering dorsal thorax
Lepitdoptera
• Moths, Butterflies
• 2 pairs of membranous wings, – covered in powdery
scales
Parts of the wing (do not need to know)
Coleoptera
• 2 pair of wings
• 1 pair of wings leathery - Elytra– Meet in a line down back
Lady Beetle
Lady Beetle
beetles
Diptera
• One pair of membranous wings
• Halters– balance– direction
Hymenoptera
• Bees, wasps, ants• 2 pair of membranous wings• Constricted abdomen• Asexual reproduction is common-
(parthenogenesis) – Fertilized eggs (2n) become queens– Unfertilized eggs (n) are drones.– In some species reportedly have no males at
all !! Reproduce by 2n eggs.
Fig. CO 21
Fig. 21.28
Lepidoptera
• 4 wings
• Powdery scales
• Butterflies, moths