Transcript Phylum Arthropoda - Diablo Valley College

Phylum Arthropoda
Arthropoda
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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
Stomach
HEART
Gills
Manidibular muscles
Stomach
• Gastric Mill (teeth)
Green Glands
• ( Aorta) Dorsal Hemolymph Vessel - red
• Intestine (“vein” in restraunts) dark
Insecta
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Basic Arthropod features
Malpighian tubules
Trachea , spiracles
Ovipositors
Fig. 21.27
Pronotum
gizzard
crop
Gastric ceca
Nervous System
Ganglia # 46
Fig. 21.35
Pierce- Suck
Siphoning
Sponging
Trachea # 40
Tracheal system attached to
muscle
Mouth parts
# 41
Ovipositor
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
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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