Zoology Test 3c Flashcards
1
Q
Hemichordate
A
acorn worm, starting to develop into a vertebrate
2
Q
habitat
A
- mud or sand flats of intertidal zones
- sluggish, live in burrows or under stones
- small phylum ( 70 species)
3
Q
features of hemichordates
A
- dorsal hollow nerve cord
- gill slits
- these are two of five chordate characteristics
4
Q
larvae in hemichordates
A
- have tornaria larvae
- very strongly resembles bipinnaria larvae of sea stars and may be evidence of evolutionary link between two groups
5
Q
evolutionary relationship between echinoderms and chordates
A
- all three phyla belong to deuterostome branch of animal kingdom
- two of five chordate characteristics found
- RNA evidence supports common ancestry
