Term
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Definition
| multicelled heterotrophs that ingest other organisms or some portion of them |
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Definition
| sheetlike array of cells that covers the body surface or lines an inner cavity or a tube |
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Definition
| crosslinking fibers stiffened with mineral deposits; the structural material for an internal skeleton |
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Definition
| the start of the outer part of epidermis and the nervous system |
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Definition
| the start of the gut's inner lining and organs derived from it |
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Definition
| gives rise to the internal organs |
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Definition
| filament-like absorptive structures |
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Definition
| the sister taxon of animals and fungi; heterotrophic cells that have a "collar" of thirty to forty microvilli round a single flagellum |
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Term
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Definition
| the body has a front-to-back axis, with an anterior or leading end and a posterior(trailing) end |
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Term
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Definition
| the body parts are organized around the main axis; most radically symmetric animals live in water |
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Term
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Definition
| the body parts have more or less equivalent right and left halves along the main body axis; many have a ventral/dorsal side |
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Term
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Definition
| an end evolves into a head, with a concentration of sensory and nerve cells that responds more efficiently to environmental stimuli |
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Term
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Definition
| the formation of the first opening becomes the mouth |
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Term
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Definition
| the formation of the first opening becomes the anus |
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Term
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Definition
| the body cavity between the gut and body wall |
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Definition
| a false coelem; the body cavity is partially line with mesoderm-derive tissue |
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Term
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Definition
| the division of functionally connected units along the main body axis |
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Term
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Definition
| the asymmetrical animals; a sheet of flattened, nonflagellated cells attached to the framework on the opposite side |
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Term
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Definition
| free-living, sexually immature stage in the development of many kinds of animals; precedes the adult form |
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Term
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Definition
| asymmetrical animals; soft, flattened body has no more than a few thousand cells; forms two different simple tissues around a thin, inner matrix |
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Definition
| soft-bodied animals that look like segmented fronds and disks |
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Term
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Definition
| radical, tentacle animals |
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Term
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Definition
| capsules with dischargeable thread under a hinged lid; has spines and barbs for protection |
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Term
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Definition
| long, flexible, prey-capturing extensions of an animal body |
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Term
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Definition
| "middle glue"; buoyant, deformable skeleton; squeezes water out of the medusa and drives it forward |
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Term
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Definition
| structural units of two or more tissues that develop in predictable patterns and interact in one or more tasks |
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Term
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Definition
| consists of two or more organs interacting chemically, physically, or both as they carry out specialized tasks |
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Term
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Definition
| simplest existing animals with organ systems that form three primary tissue layers- ectoderm, endoderm, and mesoderm; they have no coelem; they have the ability to produce sexually but most are hermaphrodites |
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Term
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Definition
| feed on tissues of living hosts but typically do not kill them outright; mature sexually in a definitive host and while immature stages live in one or more intermediate host(s) |
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Term
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Definition
| saclike digestive system; a muscular tube between the mouth and the gut |
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Term
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Definition
| clusters of nerve cell bodies that can intergrate communication signals |
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Definition
| bud behind the scolex; each is a unit of tapeworm body; hermaphroditic |
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Term
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Definition
| bilateral animal that has the most segmented body; have clusters or pairs of chitin-reinforced bristles called chaetae or setae |
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Term
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Definition
| decaying particles of organic matter |
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Term
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Definition
| two lines of communication that extend down the length of the body |
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Term
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Definition
| helps control the composition and volume of the coelomic fluids |
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Term
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Definition
| bilateral and cephalized; have a false coelom |
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Term
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Definition
| bilateral, soft-bodied animals with a reduced coelom |
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Term
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Definition
| a skirtlike extension of the body mass that drapes back on itself |
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Term
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Definition
| the process which puts the anus near the mouth; occurs ONLY in gastropods |
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Term
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Definition
| soft-bodies mollusks with chambered shells |
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Term
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Definition
| bilateral animals that have a hardened, jointed exoskeleton and specialized appendages; the have a complete gut; reduced coelom; an open circulatory system |
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Definition
| a type of protective external skeleton |
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Term
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Definition
| periodic shedding of a too-small body covering during the life cycle |
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Definition
| the process between the embryonic and adult form as the body changes, often in drastic ways, as tissues get reorganized and remodeled |
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Term
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Definition
| a system that disposes wastes and maintains ion concentrations in body fluids |
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Term
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Definition
| "spiny-skinned"; body covering that has interlocking spines and plates stiffened with calcium carbonate |
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Term
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Definition
| system that includes a main canal in each arm |
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