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Flashcards in Simple Invertebrate Deck (22):
1

A phylum of aquatic invertebrate animals that comprises the sponges

Porifera

2

Cnidaria is a phylum containing over 10,000 species of animals found exclusively in aquatic environments: they are predominantly marine species. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey

Cnidaria

3

The annelids, also known as the ringed worms or segmented worms, are a large phylum, with over 17,000 extant species including ragworms, earthworms, and leeches

Annelida

4

noting or pertaining to that form of hydrozoan that is asexual and grows into branching colonies by budding

Hydroid

5

Jellyfish or jellies are softbodied, free-swimming aquatic animals with a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate to acquire propulsion and locomotion

Jellyfish

6

The flatworms, flat worms, Platyhelminthes, Plathelminthes, or platyhelminths are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates

Platyhelminthes

7

The nematodes or roundworms constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments

Nematoda

8

Ascaris lumbricoides is the "large roundworm" of humans, growing to a length of up to 35 cm. It is one of several species of Ascaris. An ascarid nematode of the phylum Nematoda, it is the most common parasitic worm in humans

Pinworms

9

Cestoda is a class of parasitic worms of the flatworm phylum. They are informally referred to as cestodes. The best-known species are commonly called tapeworms

Tapeworms

10

Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts

Bivalves

11

The Gastropoda or gastropods, more commonly known as snails and slugs, are a large taxonomic class within the phylum Mollusca

Gastropods

12

have a body cavity called a coelom with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers).

Coelomate

13

an invertebrate lacking a coelom

Acoelomate

14

symmetry around a central axis, as in a starfish or a tulip flower

Radial Symmetry

15

The lack or absence of symmetry

Asymmetry

16

arrangement of an organism or part of an organism along a central axis

Bilateral Symmetry

17

A narrow, flexible, unjointed part extending from the body of certain animals

Tentacle

18

an explosive cell containing one giant secretory organelle or cnida

Cnidocyte

19

one of the three primary germ layers in the very early embryo

Ectoderm

20

The innermost of the primary germ layers of an animal embryo

Endoderm

21

the female gonad or reproductive gland

Ovary

22

The male gonad or reproductive glands

Teste