invertebrates

nematodes

a worm of the large phylum Nematoda, such as a roundworm or threadworm.

mollusks

invertebrates with soft, unsegmented bodies that are often protected by a hard outer shell

Flatworms (Platyhelminthes)

A group of often parasitical worms that have bilateral symmetry, a one opening digestive system, and the beginnings of a brain; tapeworm

Myriapods

A terrestrial arthropod with many body segments and one or two pairs of legs per segment. millipedes and centipedes comprise the two classes of living myriapods.

Arachnids

A member of a major arthropod group that includes spiders, scorpions, ticks, and mites. All members have eight pairs of walking legs.

Crustaceans

Shells soft bodies, no vertebra &Hard shells.

Insects

arthropods with three body sections, six legs, one pair of antenna, and usually one or two pairs of wings

Echinodermata

radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers

Cnidaria

jellyfish, corals, sea anemones

Porifera

the phylum of sponges

Collar cell

flagellated cells that line the inner cavity of a sponge

CREMR FR

C- Circulation

R-RESPIRATION

E- Excretion

M-Movement

R-Reproduction

F-Feeding

R-Response

bivalve

A mollusk that has two shells held together by hinges and strong muscles.

Nematocysts

stinging cells

cnidocytes and nematocysts

stinging cells cnidocytes contains nematocysts

Ganglia

clusters of cell bodies in the PNS

Cephalization

the concentration of nerve tissue and sensory organs at the anterior end of an organism

Acoelomate

no body cavity

pseudoceolomate

false body cavity

Coelom

body cavity lined with mesoderm

Ectotherm

cold blooded

Endotherm

warm blooded