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Species / Tylostoma Ovatum

Tylostoma Ovatum


Original description of Tylostoma ovatum by Sharpe, 1849:

  • " Shell broadly-ovate, with a moderately produced spire formed of about 6 volutions: whorls convex: mouth subovate: outer lip with a very thick, subdenticulated, internal callosity, which is repeated at intervals equal to about 5/8ths of the volution, and is accompanied by a very considerable rise in the upper margin of the whorl."

Locus typicus: Sharpe mentions no locus typicus

Stratum typicum: Cretaceous

Localities: upper beds of the hippurite limestone on the west side of Lisbon; San Fagundo, 1½ league west of Coimbra; Sarjento-mór, 1½ league north of Coimbra; the cliffs of the Praia de Maçams near Cintra. All localities are in Portugal

Dimensions: Spire angle between 70° and 80°, rounded; sutural angle varying in different parts of the whorl from 100° and 130°; length 2 3/8 inches; breadth 2 inches in one direction, 1¾ inch in the other.

Tylostoma ovatum in Sharpe, 1849, pl. IX, fig. 7 and 8

Tylostoma ovatum Sharpe, 1849; Cretaceous; Portugal; 17 mm; Coll. Philippe Simonet


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