Monotrypa

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Type Species: Chaetetes undulatus (Nicholson, 1875)
History: (Nickles & Bassler, 1900)

• 1879 Monotrypa Nicholson, Paleozoic Tabulate Corals, p. 293.
• 1881 Monotrypa Nicholson, Genus Monticulipora, pp. 102, 168.
• 1882 Monotrypa Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 153.
• 1883 Monotrypa Foord, Contr. Micro-Pal, Cambro-Sil., p. 14.
• 1886 Monotrypa Waagen and Wentzel, Pal. Indica, Ser. XIII, 875, 876.
• 1887 Monotrypa Hall and Simpson, Pal. New York, VI, p. xiii.
• 1889 Monotrypa Miller, North American Geol. Pal., p. 196.
• 1890 Monotrypa Ulrich, Geol. Surv. Illinois, VIII, p. 379.
• 1893 Monotrypa Ulrich, Geol. Minnesota, III, p. 303.
• 1896 Monotrypa (in part) Zittel’s Textb. Pal. (Engl. Ed.), p. 104.
• 1897 Monotrypa Ulrich, Zittel’s Textb. Pal (Engl. Ed.), p. 275.
• 1897 Monotrypa Simpson, Fourteenth Ann. Rep. State Geologist New york for the year 1894, p. 581.
• 1899 Monotrypa Grabau, Bull. Buffalo Soc. Nat. Sci., VI, p. 136.
• 1887 Ptychonema Hall and Simpson, Pal. New York, VI, pp. xiv, 14..
• 1889 Ptychonema Miller, North American Geol. Pal., p. 201.
• 1897 Ptychonema Simpson, Fourteenth Ann. Rep. State Geologist New York for the year 1894, p. 583.

Species found in the Cincinnatian (Bryozoa.net)

• Monotrypa cumulata? (Ulrich, 1895)
• Monotrypa intabulata (Ulrich, 1893)
• Monotrypa irregularis (Ulrich, 1879)
• Monotrypa magna (Ulrich, 1893)
• Monotrypa rectimuralis (Ulrich, 1890)
• Monotrypa sphaerica (Hall, 1883)
• Monotrypa tabulata (Hall, 1883)
• Monotrypa winteri (Nicholson, 1879)

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Sequences (Formations)

• C1 Sequence (Clays Ferry/Kope: Economy/Fulton)

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Treatise on Invertebrate Paleontology, Part G (1953):

• Massive; Zooecia angular, with undulating thin walls; Mesopores abundant

Bassler (1911):

• In Monotrypa the simplest structure of the Trematoporidae is present. The zoarium is massive and composed of simple, thin-walled, polygonal zooecia in contact, both mesopores and acnthopores being absent. Internally the wall structure is as in other trematoporoid genera, even to the crinkling so often noted in the family. The only species so far found in the Russian collections seems to be closely allied to the genotype.
• Genotype.—Chaetetes undulates Nicholson. Middle Ordovician of Canada.

Foord (1883):

• Irregular, hemispherical or globular masses. Surface smooth, or with low monticules carrying groups of larger cells than the average. Tubes thin-walled, prismatic, and traversed by straight diaphragms. No interstitial cells nor spiniform tubuli.

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