Echinoderms and Invertebrate Chordates

Question 1

Echinodermata

Answer 1

sea stars, sea urchins, sea cucumbers, brittle stars, sea lilies, sea daises
deuterostome development, internal skeleton of calcium carbonate
water vascular system, tube feet-locomotion, feeding, gas exchange
mutable connective tissue-an turn to fluid quickly in response to nervous signals

Question 2

Chordata

Answer 2

has invertebrate and vertebrate subphyla

Question 3

Chordata features

Answer 3

notochord
pharyngeal slits/clefts
dorsal hollow nerve cord
muscular postanal tail

Question 4

Cephalochordates

Answer 4

invertebrate chordates, basal chordate group, larvae planktonic, adults ,burrow at bottom

Question 5

Urochordate

Answer 5

invertebrate chordate, planktonic larvae, sessile adults
solitary or colonial. larvae do not feed, function is dispersal-can sense light and gravity to settle in a dark spot.
metamorphosis, tail absorbed and nerve cord and notocord lost, pharynx forms basket for suspension feeding