Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Unassigned
Genera: Monotrypella Ulrich, 1882

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Type species: Monotrypella aequalis (Ulrich, 1882)Species in Cincinnatian of Ohio, Indiana, Kentucky (

  • Monotrypella aequalis (Ulrich, 1882)

Taxonomic History (Nickles & Bassler, 1900)

  • 1882 Monotrypella Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 153.
  • 1883 Monotrypella Foord, Contr. Micro-Pal. Cambro-Sil. p. 15.
  • 1887 Monotrypella Foerste, Bull. Sci. Lab. Denison Univ., II, p. 171.
  • 1887 Monotrypella Hall and Simpson, Pal. New York, VI, p. xiii.
  • 1889 Monotrypella Miller, North American Geol. Pal., p. 196.
  • 1890 Monotrypella Ulrich, Geol. Sur. Illinois, VIII, pp. 377, 451.
  • 1896 Monotrypella Ulrich, Zittel’s Textb. Pal. (Engl. ed.), p. 278.
  • 1897 Monotrypella Simpson, Fourteenth Ann. Rep. State Geologist New York for the year 1894, p. 581.

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Geologic Range
Ordovician – Devonian

Stratigraphic Occurrences


Geographic Occurrences

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Sequences (Formations)

  • C5 (Waynesville: Liberty: Lower Whitewater: Saluda)

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Identification in Hand Sample:

  • Zoarium Morphology: ramose colonies
  • Zoecia: Thin walled, diaphragms throughout exozone
  • Mesozooids: rare with beaded proximal tips
  • Monticules: None
  • Maculae: None

Species Differentiation

Monotrypella aequalis from the Kope Formation of Cincinnati, Ohio (CMC 51295)

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Holland (UGA Strat Lab 2013):

  • Monotrypella forms large ramose colonies. Zooecia are thin-walled, with diaphragms throughout exozone. Mesozooids are rare and have beaded proximal tips. Extremely small styles.

Bork & Perry (1967):

  • Monotrypella has been placed in the family Amplexoporidae because it presumably lacks mesopores and is considered to have integrated wall structure (Bassler, 1953, p. G109). Cumings (1908, p. 750) argued for inclusion of Monotrypella in the genus Amplexopora.

Nickles & Bassler (1900):

  • Like Amplexopora but not distinguished by the absence of acantopores

Foord (1883):

  • Ramose, smooth or tuberculated. Cells apparently of one kind only. Walls very thin in the axial portion of the branches, but much thicker in the peripheral region. Diaphragms straight. No spiniform tubuli.

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