Simple Invertebrate Flashcards
Porifera
A phylum of aquatic invertebrate animals that comprises the sponges
Cnidaria
characterized by the specialized stinging structures in the tentacles surrounding the mouth
Annelida
characterized by an elongated, cylindrical body divided into ringlike segments
Hydroid
noting or pertaining to that form of hydrozoan that is asexual and grows into branching colonies by budding
Jellyfish
free-swimming marine coelenterate that is the sexually reproducing form of a hydrozoan or scyphozoan and has a nearly transparent saucer-shaped body
Plathyelminthes
Flatworms: phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Nematoda
any unsegmented worm of the phylum
Pinworms
A small nematoid worm that inhabits the rectum of the human host
Tapeworms
Any of the ribbon-like parasitic worms
Bivalves
Any of various mollusks of the class Bivalvia, having a shell consisting of two halves hinged together.
Gastropods
any of a large class of mollusks
Coelomate
have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm
Acoelomate
an invertebrate lacking a coelom
Radial Symmetry
a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis
Asymmetry
The lack or absence of symmetry
Bilateral Symmetry
Symmetrical arrangement of an organism or part of an organism along a central axis
Tentacle
A narrow, flexible, unjointed part extending from the body of certain animals, such as an octopus, jellyfish, or sea anemone.
Cnidocyte
an explosive cell containing one giant secretory organelle or cnida
Ectoderm
as the most exterior layer.
Endoderm
The innermost of the primary germ layers of an animal embryo
Ovary
the female gonad or reproductive gland
Teste
The male gonad or reproductive gland
