Biology Chapter 23: Invertebrate Diversity Flashcards

2436565487	blastula	Embryonic stage in most animals consisting of a single layer of cells surrounding a hollow cavity	0
2436565488	gastrula	Embryonic stage following the blastula that has an inner and outer cell layer	1
2436565489	larva	Immature form of an animal that looks different from the adult form	2
2436565490	metamorphosis	Complete change of body form in some animals from a larva to an adult	3
2436565491	invertebrate	Member of a group of animals without a backbone	4
2436565492	vertebrate	Animal with a backbone	5
2436565493	sponge	Member of a group of animals that lack true tissues and organs	6
2436565494	collar cell	Flagellated cell in a sponge's inner layer	7
2436565495	amoebocyte	Cell found in sponges and other animals that may digest and distribute food, dispose of wastes, and change into other cell types	8
2436565496	sessile	Anchored in place	9
2436565497	cnidarian	Member of a group of invertebrates with radial symmetry and tentacles with stinging cells	10
2436565498	radial symmetry	Body plan in which an organism can be divided into equal parts around a central axis	11
2436565499	cnidocyte	Specialized cell in cnidarians that functions in defense and capturing prey	12
2436565500	nematocyst	Stinging capsule found in a cnidocyte	13
2436565501	gastrovascular cavity	Digestive sac	14
2436565502	polyp	Cnidarian body form consisting of a cylindrical body with tentacles radiating from one end	15
2436565503	medusa	Cnidarian body form that is umbrella-shaped with fringes of tentacles	16
2436565504	flatworm	Member of a group of small, leaflike or ribbonlike invertebrates that includes planarians	17
2436565505	bilateral symmetry	Body plan in which an animal can be divided into two equal sides	18
2436565506	roundworm	Member of a group of cylindrical invertebrates with pointed heads and tapered tails	19
2436565507	complete digestive tract	Continuous digestive tube with a separate mouth and anus	20
2436565508	rotifer	Member of a group of invertebrates with a complete digestive tract and a crown of rotating cilia	21
2436565509	annelid	Segmented worm	22
2436565510	closed circulatory system	Blood transport system in which blood remains enclosed in vessels, and nutrients, oxygen, and wastes diffuse through vessel walls	23
2436565511	acoelomate	Animal lacking a body cavity	24
2436565512	pseudocoelom	Fluid-filled internal space that is in direct contact with the wall of the digestive tract	25
2436565513	coelom	Fluid-filled body cavity completely lined by a layer of mesoderm cells	26
2436565514	mollusk	Member of a group of invertebrates characterized by a muscular foot and a mantle	27
2436565515	mantle	Body surface outgrowth that drapes over a mollusk	28
2436565516	radula	Scraping organ characteristic of mollusks	29
2436565517	open circulatory system	Blood transport system in which blood is pumped into chambers where it comes in direct contact with tissues and organs	30
2436565518	gastropod	Member of a group of mollusks that includes snails and slugs	31
2436565519	bivalve	Member of a group of mollusks with hinged shells, such as clams, mussels, scallops, and oysters	32
2436565520	cephalopod	Member of a group of mollusks that includes squids and octopuses	33
2436565521	echinoderm	Member of a group of marine invertebrates that includes sea urchins and sea stars	34
2436565522	endoskeleton	Skeleton located inside the body; characteristic of all vertebrates and some invertebrates	35
2436565523	water vascular system	In echinoderms, a network of water-filled canals that function in movement, food gathering, and as a basic circulatory system	36
2436565524	tube feet	In echinoderms, structures that are part of the water vascular system and function in locomotion, feeding, and gas exchange	37