Chapter #33- Ecdysozoans

Cuticle

tough coat that ecdysozoas are covered by, it is molted through a process called ecdysis

2 phylum of Ecdysozoans

nematada and arthropoda

Phylum Nematoda

are roundworms that are found in aquatic habitats, soil, and body fluids and tissues of animals

Phylum Arthropoda- 4 subphylums

Cheliceriforms, myriapods, hexapods, crustaceans

arthropods body plan consists of 3 things

segmented body, hard exoskeleton, jointed appendages

hemolymph

fluids in arthropods open circulatory system that circulates into the spaces surrounding the tissues and organs

Subphylum Cheliceriformes are named for their

clawlike feeding appendages called chelicerae

Horseshoes crabs belong to which arthropod subphylum

Cheliceriformes

Most common cheliceriforms are what

arachnids

Arachnids include

spiders, scorpions, mites, ticks

Arachnids have what body parts

an abdomen, cephalothorax- has 4 pairs of legs and 1 pair of chelicerae

Subphylum myriapods include

millipedes and centipedes

Millipedes have

2 pairs of legs per segment

Centipedes have

1 pair of legs per segment

Subphylum Hexapoda include

insects and other relatives

what is the greatest key to success of insects

flight or wings

Insect Order- Lepidotera

butterflies and moths

Insect Order-Diptera

flies, mosquitoes, midges

Insect Order-Coleoptera

Beetles

Insect Order- Hymenoptera

bees, wasps, hornets, ants

Insect Order-Hemiptera

true bugs-stinkbugs and bedbugs

Insect Order-Orthoptera

grasshoppers, crickets, katydids

Insect Order-Ordonata

dragonflies

Subphylum Crustacea include 2 orders

isopods and decapods

Order Isopod

include terrestrial, freshwater, and marine species

Example of an isopod

pill bugs

Order Decapods

relatively large crustaceans

Decapods example

lobsters, crabs, crayfish, and shrimp