zool lesson 3

the simplest invertebrates

defining cell type of poriferans

most familiar organisms

Their body structure facilitates the movement of water for feeding, excretion, and gas exchange.

Reproduce by sexual as well as asexual methods

possess both male and female gametes

Pores on the side that allow water to flow into the spongocoel

Large opening where water exits after passing through the spongocoel

Large Central cavity lined with chondrocytes and other cells

has calcareous spicules

with six-rayed siliceous spicule

have siliceous spicules, spongin or both

sponges have multilayered calcium carbonate skeletons

exhibit radial or biradial symmetry

defining cell type of cnidarians

serve to capture prey or repel predators.

serves both digestive and circulatory functions with gas exchange by diffusion between cells and the environment.

oral end of the polyp bearing the mouth and tentacles

2 types of body forms of Cnidarians

used for attachment to a substrate

conical elevation containing the mouth part

asexually produced outgrowth

Cubozoa contain muscular Pads called

true jelly fish

boxy jellyfish

exhibit a sessile polyp body plan only ▪ all marine dwelling ▪ may be colonial or solitary