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18 Cards in this Set
- Front
- Back
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is deuterostomia a clade or grade?
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clade
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what does deuterostomia include?
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Echinodermata, Hemichordata, Chordata
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What kind of animals does Echinodermata include?
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urchins, sea stars, sea cucumbers
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what does echinodermata mean
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"spiny skin" , in reference to their endoskeleton
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describe the endoskeleton of echinodermata
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Ca rich plates below skin. Pores for water vascular system
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describe the water vascular system
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water enters through madreporite , moves through stone canal, then enters ring canal that encirces the esophagus. Radial canals extend into the 5 body parts. Contraction of ampulla at base of tube foot causes fluid to be forced into tube foot-- used for movement
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what kind of symmetry does echinodermata show
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pentaradial
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list the 6 classes in echinodermata
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crinoidea, asteroidea, ophiuroidea, holothuroidea, concentricyloidea, echinoidea
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what is crinoidea
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sea lilies (calcareous stalk, living fossils) & feather stars. mouth & anus on same side.
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what is asteroidea
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sea stars or starfish. feed mainly on bivalves. extrudes stomach into opening & digests prey.
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what is ophiuroidea
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brittle stars.
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what is echinoidea
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sea urchins & sand dollars. no arms, move via spines on tube feet, vegetarians.
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what is holothuroidea
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sea cucumbers. will extrude their foul smelling stomachs when frightened
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what is concentricyloidea
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sea daisies. recently discovered. no arms.
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What animals does Hemichordata consist of
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acorn worms
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what does hemichordata mean
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"half chordates"
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T or F: Hemichordata forms a clade with Echinodermata
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true
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what characteristics do hemichordates share with chordates/
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dorsal nerve cord a well as ventral nerve cord. part of dorsal nerve cord hollow in some. throat with pharyngeal gill slits.
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