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Monoplacophora

Tryblidia; Monoplacophorans

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  • Nature Mapping, University of Washington

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Following modified from Nature Mapping, University of Washington
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http://www.fish.washington.edu/naturemapping/mollusks/mono/6mono_int.html ---> http://depts.washington.edu/natmap/mollusks/mono/6mono_int.html

Preface to Class of Monoplacophora

Monplacophora
Literal meaning: Bearing one plate

Common name: None

Shell: Members of this class have a single, cap-shaped shell similar to a limpet.
  • The apex of the shell is forward on the Monoplacophorans.
  • The shell is relatively small ranging in size from 3 to 30 mm in diameter.

    • Animal: The animal body is composed of a head, a mantle and a large flattened foot.
  • Gills , nephrida, pedal retractor muscles and nerve connections are found in a pallial groove which surrounds the foot.
  • These organs repeat serially. They consist of six pairs of nephrida, five or six pairs of gills, and eight pairs of dorso-ventral pedal retractor muscles.
  • There are two pairs of gonads. No eyes or tentacles are present.

    Habitat: All species are marine.

  • Their range is limited to deep waters mostly in ocean trenches.

    Etc.: Monoplacophorans were thought to be extinct until 1952 when ten living specimens were dredged off the coasts of Costa Rica and Peru by the Galathea Expedition. At present, only a few living species are known to exist.

    Food: Unknown

    Reference: Class - Monoplacophora

    (6-0-0-0-0-0-0-0-0-0-0-0-0)
    Ref. Keen, 1971 p 857
    Vaught, 1989 p viii,5

    Updated: 2010-01-04 11:28:30 gmt
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