Chapter 32 Animal Diversity Flashcards

458494798	cleavage	A succession of mitotic divisions without cell growth between divisions	0
458494799	blastula	Stage where embryo is a hollow ball of cells	1
458494800	gastrulation	When layers of embryonic tissue that will develop into body parts are produced	2
458494801	gastrula	Stage where one end of the embryo has folded inward, forming a pouch	3
458494802	archenteron	Pouch formed by one end of the embryo folding inward	4
458494803	endoderm	Lines digestive tract, develops from lining of archenteron	5
458494804	ectoderm	Covers body surfaces	6
458494805	mesoderm	In some animals; forms muscles and most organs	7
458494806	diploblastic	______________ animals - have no mesoderm. Enidarians (jellies and corals)	8
458494807	triploblastic	____________ animals - have mesoderm	9
458494808	metamorphosis	Resurgence of development that transforms larva into adult	10
458494809	Cambrian explosion	When many new animal species came to be, probably due to new predator-prey relationships	11
458494810	grade	Group of animals that share same level of organizational complexity but not necessarily descended from a common ancestor	12
458494811	body plan	morphological and developmental traits that define a grade	13
458494812	radial symmetry	No head or rear end, no left or right	14
458494813	bilateral symmetry	Two-sided symmetry	15
458494814	dorsal	Top	16
458494815	ventral	Bottom	17
458494816	anterior	Toward the head	18
458494817	posterior	Toward the tail	19
458494818	cephalization	Central nervous system in the head	20
458494819	coelom	Tract from outer body wall	21
458494820	coelomates	Animals that possess a true coelom	22
458494821	pseudocoelomates	Animals that have a body cavity formed from the blastocoels	23
458494822	acoelomates	Animals that lack a coelom	24
458494823	protostomes	Have spiral cleavage, determinate cleavage, blastopore opening becomes the mouth	25
458494824	spiral cleavage	Planes of cell division are diagonal	26
458494825	determinate cleavage	Rigidly casts the fate of embryonic cells very early	27
458494826	deutrostomes	Have radial cleavage, indeterminate cleavage, blastopore opening becomes anus; mouth forms from secondary opening	28
458494827	radial cleavage	Cleavage planes parallel or perpendicular	29
458494828	indeterminate cleavage	Each cell in early development retains same capacity to develop into a complete embryo	30
458494829	choanocytes	Flagellated cells that draw water into sponge	31
458494830	osculum	Opening where water exits	32
458494831	amoebocytes	Digest and distribte nutrients	33
458494832	spicules	Skeletal needles	34
458494833	medusa	Floating, umbrella shaped body with dangling tentacles (like jellyfish)	35
458494834	polyp	Cylinder shaped body with rising tentacles (like sea anemone)	36
458494835	nymphs	Young small versions of adult	37
458494836	larvae	A distinct juvenile form many animals undergo before metamorphosis into adults	38
458494837	pupa	The life stage of some insects undergoing transformation	39
458494838	notochord	A dorsal, flexible rod that functions as support. Usually replaced by bone during development	40
458494839	dorsal nerve cord	A hollow cord dorsal to the notochord	41
458494840	pharyngeal gill slits	In embryos of chordates; become gills or disappear during development	42