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Lab_09_Worksheet_Key - 4 Does pentaradiate symmetry exist...

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NAME ______KEY _______________ SECTION ______ EFB285 - ZOOLOGY LAB LAB 9 1. (2 points) Echinoderms are deuterostomes / protostomes (circle one). That means the blastopore / blastocoel (circle one) formed during the blastula / gastrula (circle one) stage forms the mouth / anus (circle one) in the adult. 2. (2 points) Describe, briefly, the structure and function of the water vascular system. The water vascular system includes the tube feet, ampulla, the ring canal, the radial canals and the madreporite. Its main function is for locomotion and food gathering. 3. Describe pentaradiate symmetry in Echinoderms. It refers to the distinguishing feature in which the body parts are always arranged radially in five or multiples of five.
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Unformatted text preview: 4. Does pentaradiate symmetry exist for all stages of development? NO Explain: the larvae are bilaterally symmetrical 5. (4 points) Define each of the following: a. Madreporite plate - single structure on the aboral side of Echinoderms used to bring water into the water-vascular system. b. Dermal branchiae - part of the water vascular system, these tender bulbs project through the endoskeleton of the echinoderms to provide a respiratory function. c. Dermal endoskeleton - system of calcareous plates and spines, often fused into an investing armor d. Ambulacral - from the latin ambulare – to walk, refers to the grooves and spines on the oral side of the echinoderm associated with locomotion....
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  • Spring '08
  • Deuterostome, ZOOLOGY LAB LAB, ______KEY_______________ SECTION ______, pentaradiate symmetry, pentaradiate symmetry exist

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