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Chapter 23 Vocab

Chapter 23: Invertebrate Diversity

TermDefinition
Collagen three-stranded protein unique to small animals
Homeotic class of genes that control early developments
Homeobox sequence of 180 nucleotides that define Hox genes
Vertebrate an animal with an internal segmented backbone
Invertebrate animals without backbones
Phylum animals defined by structural and functional characteristics that are different from every other animal group
Bilateral Symmetry animals that can be divided equally along only one plane, which splits and animal into mirror-image sides
Radial Symmetry animals with body parts arranged in a circle around a central axis
Protostome the mouth is formed first, and the anus second
Deuterostome the first opening forms the anus, and the mouth is formed second
Sessile unable to move from where they are attached
Filter Feeder eat by straining particles from the water
Polyp cylindrical tubes with mouth and tentacles facing upward
Medusa umbrella-shaped, with their mouths as tentacles on the underside
Mesoglea noncellular jellylike material that separates cnidarian bodies
Nematocyst a capsule containing a thin, coiled, harpoon-shaped tubule with a poisonous barb at one end
Gastrovascular Cavity saclike digestive space where the nematocysts stuff their tentacles
Complete Digestive Tract consist of two openings- a mouth and an anus- at opposite ends of a continuous tube
Radula filelike feeding organ
Hemocoel consists of spaces between cells within the animal’s tissues
Segmentation refers to the division of an organism’s body
Coelom a fluid-filled space that is surrounded by muscle
Cuticle made of chitin, and must be shed whenever that animal grows larger
Pseudocoelom fluid-filled space not completely lined by muscle
Ossicle many tiny interlocking calcium-based plates that make up the internal skeleton of echinoderms
Water Vascular System series of water-filled radial canals that extend along each arm from the ring canal surrounding the central disk
Created by: SavanahT
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