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Species / Endoptygma Umbilicata


Original description of Phorus umbilicatus by Tuomey, 1854, p. 169:

  • "Shell depressed ; whorls four, uneven, concave below; suture profound (in the cast); umbilicus deep, surrounded by a channel"

Locus typicus: Noxubie county, Mississippi State, USA

Stratum typicum: upper Cretaceous

Comment tuomey, 1854, p. 169:

  • "Distinguished from Phorus (Trochus) leprosus by the channeled umbilicus. Diameter, 1.75 in."

History and Synonymy


Description of Endoptygma umbilicata (Tuomey).by Weller, 1907:

  • "Shell rather below a medium size, spire broadly conical, with an apical angle of about 80, and composed of about four volutions; base flat or slightly concave, and in the cast showing a small open umbilical perforation, representing the comparatively slender solid columella; the base of the cast is marked by a rather deep, narrow, spiral groove, about one-third to one-fourth of the width of the volution from the umbilical cavity, marking the position of an internal spiral ridge at this point on the inside of the basal portion of the shell; volutions flattened in this direction of the spire, with moderately distinct suture lines separating them in the casts, their surfaces closely and deeply scarred by the attachment of foreign substances to the outside of the shell during life."

Localities: Matawan, Monmouth County; Moorestown-Lenola, Burlington County, all in New Jersey State, USA

Stratigraphy: Merchantville Formation, lower Campanian, upper Cretaceous

Endoptygma umbilicata in Weller, 1907, pl. LXXVIII, fig. 4, 5

Comment of Ponder, 1983:


  • Tuomey, M 1854. Descriptions of new Fossils from the Cretacous Rocks of the southern States; Proceedings of the Academy of Natural Sciences of Philadelphia vol. 7, p. 167-173, Fulltext
  • Weller, 1907

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