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11.2: Invertebrate Evolution

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
bilateral symmetry Symmetry of a body plan in which there are distinct head and tail ends, so the body can be divided into two identical right and left halves.
cephalization Concentration of nerve tissue in one end of an animal, forming a head region.
coelom Fluid-filled body cavity.
complete digestive system Digestive system consisting of a digestive tract and two body openings (mouth and anus).
ectoderm Outer embryonic cell layer in animals.
endoderm Inner embryonic cell layer in animals.
hydrostatic skeleton Type of internal support in an animal body; results from the pressure of fluid within the body cavity known as the coelom.
mesoderm Embryonic cell layer in many animals that is located between the endoderm (inner cell layer) and ectoderm (outer cell layer).
pseudocoelom Partial, fluid-filled cavity inside the body of some invertebrates.
radial symmetry Symmetry of a body plan in which there is a distinct top and bottom but not distinct head and tail ends, so the body can be divided into two halves like a pie.
segmentation Division of an animal body into multiple segments.
symmetry The characteristic of having two identical halves, such as in a symmetrical organism.
multicellularity Composed of more than one cell.

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Difficulty Level:
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Date Created:
Feb 24, 2012
Last Modified:
Sep 04, 2016
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SCI.BIO.815.L.1