Homotrypa wortheni

Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Mesotrypidae
Genus: Homotrypa
Species: Homotrypa wortheni (James, 1882)

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Originally: Monticulipora wortheni
Includes: Subspecies H. wortheni prominens

Taxonomic History (Nickles & Bassler, 1900)

  • 1882 Monticulipora (Monotrypa) wortheni James, Paleontologist, No. 6, p. 50, pl. i, 2.
  • 1894 Monticulipora wortheni J.F. James, Jour. Cincinnati Soc. Nat. Hist., XVI, p. 207.

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Stratigraphic Occurrences


Geographic Occurrences

Map point data provided by iDigBio.
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Sequences (Formations)

  • C6 Sequence (Elkhorn)
  • C5 Sequence (Lower Whitewater)
  • C4 Sequence (Arnheim: Oregonia)

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Identification in Hand Sample

  • Zoarium Morphology: Ramose to frondose
  • Zoecia: Often oblique; thin walled (sometimes crenulated); numerous, small acanthopores
  • Mesozooids: Few to none
  • Monticules: Sharp, high monticules.
  • Maculae: Larger cell apertures

Homotrypa wortheni from the C5 Formation of Maysville, Kentucky (OUIP 1747)

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Davis (1998)

  • Externally resembles those Parvohallopora ramosa with sharp, high monticules. Numerous small acanthopores, practically no mesopores.

McFarlan (1931)

  • Strongly and sharply monticulated, ramose. Distinguished from H. bassleri by more numerous acanthopores.

Bassler (1903)

  • James’s description and figures of M. wortheni (=Homotrypa wortheni) are scarcely sufficient to recognize the species or even to place the form generically. The following description is based on material identical with specimens of M. wortheni in the collections of the U.S. National Museum with Mr. James’s label attached: Zoarium ramose, branches cylindrical, usually about 6mm. in diameter and dividing frequently and rather regularly. Surface marked with strong, prominent tubercles, usually 2mm apart. Apertures polygonal, direct, rather thick walled, about 9 in 2mm. Mesopores in the typical form few, although in the variety described below, they are quite numerous. Acanthopores numerous, often inconspicuous at the surface, but blunt when present.
  • The sharply tuberculated branches of this fine species readily distinguish it from associated forms.

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