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Biology 03050, Invertebrate Zoology

Handout for Laboratory 12: ECHINODERMS

Manual: Hickman et al., 9th ed., Exercise 17, pp. 251-267


WORD BANK (terms that you are responsible for):

  1. aboral surface
  • ambulacral groove
  • ampulla
  • anus
  • bivium
  • cardiac stomach
  • central disc
  • Class Asteroidea (sea stars)
  • Class Crinoidea (sea lilies)
  • Class Echinoidea (sea urchins, sand dollars)
  • Class Holothuroidea (sea cucumbers)
  • Class Ophiuroidea (brittle stars)
  • cloaca
  • dermal ossicle (calcareous plate)
  • digestive gland (pyloric ceca)
  • gonad
  • intestine
  • lateral canal
  • longitudinal muscle band(s)
  • madreporite plate (sieve plate)
  • mouth
  • oral surface
  • pedicellaria
  • pharynx
  • Polian vesicle
  • pyloric duct
  • pyloric stomach
  • radial canal
  • ray
  • respiratory tree
  • retractile muscle
  • ring canal
  • skin gill (dermal branchia; papula)
  • sole
  • spine
  • stone canal
  • tentacle
  • trivium
  • tube foot (podium)

    Using your lab manual, perform those parts of Exercise 17 listed below:

    17: Read over the introduction to the phylum, pp. 251-252.

    17A: Using a preserved sea star, examine external and internal features, highlighting the terms listed above. Note how its contents are radially arranged. Follow the water-vascular system from the madreporite plate to the tube feet. Be sure to follow up with a slide of a cross section of a sea star ray--it's important to visualize 3-D structures in 2-D!

    17B: Examine external features of a preserved brittle star. How does this differ from a sea star?

    17C: Examine external features of preserved sea urchins and sand dollars. Can you see narrow tube feet on the sea urchin?

    17D: Examine external features of a preserved sea cucumber. Where are the typical features of an echinoderm in a sea cucumber? Dissect a preserved sea cucumber, highlighting the structures mentioned in the word bank. How do these internal features differ from those of the sea star? Do they reflect the different lifestyle seen in the sea cucumber?

    17E: Examine external features of the cast of the sea lily fossil. Note its stalk and upward-facing oral surface.

    Your instructor may assign you additional questions from the lab manual as homework and/or as quiz questions.

    Your notes and drawings:


    |main page| |background| |03028: Physiology| |03048: Anatomy|

    |03050: Invertebrate Zoology| |03051: Vertebrate Zoology| |03074: Economic Botany|


    Please send comments and questions to: cronewil@hvcc.edu


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    This page updated October 25, 1999