Cyphotrypa frankfortensis

Phylum: Bryozoa
Class: Stenolaemata
Order: Trepostomatida
Family: Atactotoechidae
Genus: Cyphotrypa
Species: Cyphotrypa frankfortensis (Ulrich & Bassler, 1904)

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  • 1904 Cyphotrypa frankfortensis Ulrich & Bassler, Smiths. Misc. Coll., 47, p. 30, pl. 8, figs. 7-9.
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    Stratigraphic Occurrences


    Geographic Occurrences

    Map point data provided by iDigBio.
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    Sequences (Formations)

    • C1 Sequence (Lexington/Pt. Pleasant)

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    Identification in Hand Sample

    • Zoarium Morphology: Massive to subspherical
    • Zoecia: Polygonal; thin-walled (9-10 in 2mm); acanthopores well developed; large but few
    • Mesozooids: None
    • Monticules: Prominent
    • Maculae: Of larger zooecia, slightly elevated

    Cyphotrypa frankfortensis from unknown formation of Lexington-Fayette County, Kentucky (CMCIP 1124)

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    McFarlan (1931):

    • Zooarium of thick, undulating to sub-spherical masses. Zooecia thin-walled (9-10) in 2mm. Comparatively large acanthopores (~1 per zooecium). Characterized by montiuled surface, small zooecia, few acanthopores.

    Miller (1913):

    • Cyphtotrypa frankfortensis, a bryozoan of globular habit, described and referred to this horizon by E. O. Ulrich; a large coralline fossil.

    Ulrich & Bassler (1904):

    • The zoarium of this well-marked species forms large, often undulating expansions usually 7 cm. or more in diameter and 1 cm. in height; but sometimes heaped-up masses, 4 or 5 cm. high, occur as the result of the superposition of several layers of zooecia. The surface usually bears small, sharp monticules. Zooecia small, 9 to 10 in 2 mm., five or six sided, with very thin walls. Acanthopores rather large and distinct but not abundant, averaging only about one to each zooecium. Diaphragm entirely wanting in the immature region and from one to two tube-diameters apart in the mature zone which is distinguished only by the fact that diaphragms are here developed.
    • The large monticulated masses formed by this species, its small zooecia and few acanthopores, and the absence of diaphragms in the immature regions, distinguish it. Small weathered specimens or fragments may be confused with C. acervulosa, which has zooecia of the same size, but as the zooecial tubes are abundantly tabulated in that species, collectors should experience little difficulty in distinguishing even small fragments.

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