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Biology 03050, Invertebrate Zoology

Handout for Laboratory 7: NEMATODES AND ROTIFERS

Lab Manual: Hickman et al., 9th ed., Exercise 11, pp. 163-174



WORD BANK (terms that you are responsible for):


  1. adult
  • anterior
  • anus
  • circular muscle
  • cloaca
  • corona
  • cross section of female (Ascaris)
  • cross section of male (Ascaris)
  • cuticle
  • cutting plate
  • cyst
  • dorsal
  • ejaculatory duct
  • excretory pore
  • female
  • foot (tail)
  • genital pore (vulva)
  • giant intestinal roundworm (Ascaris)
  • hookworm (Ancylostoma, Necator)
  • intestine
  • larva
  • lateral line(s)
  • lips
  • longitudinal (lateral) muscles (and muscle cells)
  • male
  • mastax
  • mouth
  • muscle cell
  • nerves (dorsal and ventral)
  • ovary
  • oviduct
  • pharyngeal bulb
  • pharynx
  • pinworm (Enterobius)
  • porkworm (Trichinella)
  • posterior
  • pseudocoel(om)
  • rotifer (Philodina)
  • seminal vesicle
  • spicule
  • testis
  • uterus
  • vagina
  • vas deferens
  • ventral
  • vinegar eel (Turbatrix)

    Using your lab manual, peform those parts of Exercise 11 listed below:

    11: Read over the introduction to the phyla, pp. 163-164

    11A: Examine external and internal features of the giant intestinal roundworm Ascaris, highlighting the terms listed above. Please note that there is at least a theoretical chance of egg viability, even when preserved--use good lab technique with gloved hands, hand washing, and no food/drink in the lab!! Make sure that you see both male and female worms during lab.

    Examine cross section slides of male and female giant intestinal roundworms. Can you tell the differences? Can you identify structures in cross section?

    Examine living vinegar eels (Turbatrix). What does their movement tell you about nematode musculature?

    Examine slides of hookworms, pinworms, and porkworms: be aware of their life cycles and the diseases that they cause. The slides represent what stage(s) of their life cycles?

    11B: Examine living rotifers (and prepared slides for additional internal details). What is the purpose of the corona? What types of muscles do rotifers have?

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

    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 8, 1999