Phylum Arthropoda. Arthropoda Name means “Joint” “foot” segmented coelomates with jointed appendages Exoskeletons of chitin Ecdysis (Molting) There are.

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

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