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Handout for Laboratory 3, Vertebrate Zoology 03051

Classes Cepahalaspidomorphi and Myxini: lampreys and hagfishes

Lab manual (Hickman et al., 9th ed.), Exercise 19A, pp. 279-284

(and text, Hickman et al., 7th ed., Ch. 27, pp. 583-587)

WORD BANK: terms/structures that you may be expected to find and know from this lab:

  1. ammocoetes
  • anterior cardinal vein
    		•
  • anus
    		•
  • atrium
    		•
  • barbel (hagfish)
    		•
  • brain
    		•
  • buccal chamber
    		•
  • buccal funnel
    		•
  • caudal fin
    		•
  • Class Cephalaspidomorphi: lamprey
    		•
  • Class Myxini: hagfish
    		•
  • coelom (body cavity)
    		•
  • cloaca
    		•
  • cranial cartilage
    		•
  • dorsal aorta
    		•
  • dorsal ciliated ridge
    		•
  • dorsal fin
    		•
  • ear vesicle
    		•
  • endostyle
    		•
  • epidermis
    		•
  • esophagus
    		•
  • external gill slit
    		•
  • eye
    		•
  • forebrain
    		•
  • gall bladder
    		•
  • gill bar
    		•
  • gill pouch
    		•
  • heart
    		•
  • hindbrain
    		•
  • horny teeth
    		•
  • internal gill slit
    		•
  • intestine
    		•
  • kidney
    		•
  • lateral line
    		•
  • lingual cartilage
    		•
  • liver
    		•
  • midbrain
    		•
  • mouth
    		•
  • myotome
    		•
  • nasopharyngeal pouch
    		•
  • nerve cord
    		•
  • nostril
    		•
  • notochord
    		•
  • olfactory lobe
    		•
  • oral hood
    		•
  • oral papilla
    		•
  • pericardial cavity
    		•
  • pharynx
    		•
  • pores of slime sac (hagfish)
    		•
  • posterior cardinal vein
    		•
  • sinus venosus
    		•
  • tongue
    		•
  • typhlosole
    		•
  • urogenital papilla
    		•
  • velum
    		•
  • ventral aorta
    		•
  • ventral ciliated ridge
    		•
  • ventricle

    • Lamprey: pp. 279-284

    Examine a whole mount slide of an ammocoetes (larval lamprey) as well as a slide of cross sections. Be able to find structures from the above list, and being able to localize them and describe their function. How is the larval lamprey similar to a lancelet? How is it different? Examine a preserved adult lamprey. Be sure to examine external features before cutting. The lab manual describes a sagittal section for dissecting, but feel free to try a ventral midline incision first to highlight internal structures before that. What types of vertebrate structures are present in an adult lamprey? What typical vertebrate features are missing? Your laboratory instructor may, in addition, ask and/or quiz you on questions taken from the lab manual. Your notes and drawings:

     

     

    Hagfish: text book, pp. 583-587

    Everyone should at least examine external features of the preserved specimens. How are these similar to lampreys on the outside? How are they different? If enough are available, some of you will have a chance to dissect hagfish as well as a lamprey. Major differences of hagfish internal anatomy (vs. lamprey) include the following:

    1. a single large tooth in the roof of its mouth
    2. two semicircular rows of teeth on its rasping organ
    3. no"teeth" in the funnel of the mouth
    4. no typhlosole fold in the intestine

    What other differences can you find? Your instructor may, in addition, ask and/or quiz you on additional concerns. 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 web page last updated on February 15, 2000