Outline for Zoology Lab-Invertebrates (1)

Poifera

sponges; asymmetrical; no tissues, organs, & borderline multicellular

Cnidaria

corals, hydra, & jellyfish; radially symmetrical; no organs but two tissues; diploblastic

Cnidocytes

stinging cells; bumps on side of hydra model

Platyhelminthes

flatworms, flukes, & tapeworms; bilaterally symmetrical; protostome acoelomate; triploblastic

Mollusca

clams, snails, octopus, nautilus, chitons, oysters & squids; bilateral symmetry; coelom; protostome coelomates

Body plan of mollusca

mantle, visceral mass, & foot

Mantle

makes the shell made of calcium carbonate

Coelom

internal body cavity derived from mesoderm

Picture of poifera

Ostia

holes on the side where food enters

Osculum

where waste products come through at the very top

Spongocoel

below osculum where food & H2O mix

Spicules

containing protein spongin (commercial cleaning sponges); provides structure

Each individual cell sponge contains what?

flagella

What are the two tissues in cnidaria?

epidermis & gastrodermis

Gastrovascular cavity

lined by gastrodermis; allows animals to digest prey that is larger than its individual cells

Polyps

vase shape; hydra model; sea anemones & corals

Medusa

bowl shape; includes all adult jellyfish

Nematocytes

stinging harpoons that cnidocytes shoot out to sting prey with

Picture of sea anemones

radial symmetry; in model, the orange part is the mesoglea & white is tentacles; polyp

Coelenteron

incomplete digestive tract

Each hole of a coral represents a

polyp; animal is gone & only has secretion of calcium carbonate that helps build reefs

Polyps with tentacles are

in feeding

Portuguese man-of-war

colony of medusas & polyps