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

http://biodidac.bio.uottawa.ca/Thumbnails/showimage.cfm?File_name=CRUS079P&File_type=GIF

http://biodidac.bio.uottawa.ca/Thumbnails/showimage.cfm?File_name=CRUS081P&File_type=GIF

Stomach

• Gastric Mill (teeth)

Green Glands

• ( Aorta) Dorsal Hemolymph Vessel - red

• Intestine (“vein” in restraunts) dark

http://biodidac.bio.uottawa.ca/Thumbnails/showimage.cfm?File_name=CRUS078P&File_type=GIF

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

http://biodidac.bio.uottawa.ca/Thumbnails/showimage.cfm?File_name=ORTH045P&File_type=GIF

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

• 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