Zoology Test 3c Flashcards Preview

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Flashcards in Zoology Test 3c Deck (5)
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1

Hemichordate

acorn worm, starting to develop into a vertebrate

2

habitat

- mud or sand flats of intertidal zones
- sluggish, live in burrows or under stones
- small phylum ( 70 species)

3

features of hemichordates

- dorsal hollow nerve cord
- gill slits
- these are two of five chordate characteristics

4

larvae in hemichordates

- have tornaria larvae
- very strongly resembles bipinnaria larvae of sea stars and may be evidence of evolutionary link between two groups

5

evolutionary relationship between echinoderms and chordates

- all three phyla belong to deuterostome branch of animal kingdom
- two of five chordate characteristics found
- RNA evidence supports common ancestry