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15 Cards in this Set
- Front
- Back
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ancestral traits
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true tissues
bilateral symmetry organ systems Coelomate triploblastic complete digestive tract |
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what is the new derived trait
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deuterostome
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what is the blastopore?
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1st opening of digestive tube that develops in embryo will become either mouth (protostome) or anus (deuterostome)
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phylum echinodermata traits
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water vascular system
endoskeleton of cartilagenous plates called ossicles autotomizing limbs pentaradial symmetry tube feet |
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what are the 5 echinodermata classes
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class asteroidea
class echinoidea class ophiuroidea class crinoidea class holothuridea |
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class asteroidea
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sea stars
predators of bivalves, gastropods, and corals dermal gills that extend off skin and aid in gas exchange pedicellaria: microscopic jaws surrounding spines; aid in defense ambulacral groove |
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class ophiuroidea
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brittle stars
live in deep water feed off dead organic matter and sometimes filter feed most are nocturnal closed ambulacral groove tube feet emerge between ossicles that sense light and odors and capture food |
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class crinoidea
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sea lilies (sessile) but move arms to filter feed and feather stars
mouth and anus on top filter feed stacked ossicles arms divided into pinnules that trap food cirri=legs for perching on rocks |
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class echinoidea
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sea urchins and sand dollars
test: round shell formed by fused ossicles movement by: tube feet which protrude through holes in test jointed spines which upright itself if overturned teeth (aristotles latern) 5 ossified plates |
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class holothuroidea
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sea cucumbers
feeding with branched tube feet soft bodies no or few spines for defense pentaradial symmetry when body axis oriented horizontal expel sticky tubules from cloaca Ring canal pumps water respiratory tree: gas exchange through water enter/exit anus |
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sea cucumbers
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class holothuroidea
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sea urchin and sand dollars
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class echinoidea
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sea lilies and feather stars
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class crinoidea
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brittle stars
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class ophiuroidea
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sea stars
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Class asteroidea
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