early animals

which phyla has no true tissues or organs

porifera

what are choanocytes responsible for in porifera

creating water flow and trapping food

what skeletal materials do porifera use

spicules and spongin

what body plan do cnidarians have

diploblastic

which class of cnidarians includes true jellyfish

scyphozoa

which trait is unique to echinoderms

water vascular system

what type of symmetry do adult echinoderms have

pentaradial

how do echinoderms primarily reproduce

mostly sexual, with external fertilization

what system do echinoderms use for circulation

water vascular system

calcarea

calcium carbonate spicules

hexactinellida

glass spongin with six-point silica spicules

demospongiae

largest group; spongin/ silica

hydrozoa

hydra; both polyp and medusa stages

schyphozoa

true jellyfish; mainly medusa form

anthozoa

corals and sea anemones; only polyp stage

asteroidea

sea stars

echinoidea

sea urchins, sand dollars

holothuroidea

sea cucumbers

name one way porifera reproduce and describe it briefly

asexual (e.g. budding); sexual via gametes

how do cnidarians capture prey

using cnidocytesz with nematocysts to sting and immobilize prey

explain how echinoderms breathe

diffusion through skin gills and tube feet