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Species / Orthaulax Aguadillensis


Original Description of Orthaulax aguadillensis by Maury, 1920 cited by Cooke, 1922:

  • "Shell large and heavy; form of spire short and blunt, like that of Orthaulax pugnax: This at once distinguishes the shell from the Dominican species O. inornatus Gabb, which is high-spired. A further characteristic of the shell is the evenly rounded form of the shoulder, which in cross section would be almost perfectly circular. This marks it off very decisively from the Floridian Chipolan species Orthaulax gabbi Dall, which is markedly triangular at the shoulder. The spire measures 45 millimeters in diameter."

Locus typicus: Aguadilla, Puerto Rico Island, USA, northeastern Caribbean Sea

Stratum typicum: Aymamon Limestone, lower Miocene

Geologic occurence:

  • Cevicos Limestone, upper Oligocene/lower Miocene; Hispaniola Island, Dominican Republic
  • Aymamon Limestone, lower Miocene; Puerto Rico Island, USA
  • Baitoa Formation, lower Miocene; Hispaniola Island, Dominican Republic
  • Thomonde Formation, lower Miocene; Hispaniola Island, Haiti
  • Consolacion Limestone, lower Miocene; Cuba Island

History and Synonymy


Cooke, 1922, p. 25:

  • "Orthaulax aguadillensis. - Orthaulax aguadillensis Maury is widely distributed in the West Indies but has not yet been reported from the continents. The type was taken by Reeds from the Aguadilla limestone at Aguadilla, P.R. It is probable that some of the specimens of Orthaulax collected by Hubbard elsewhere in Porto Rico belong to this species. Large casts of Orthaulax that appear to be referable to 0. aguadillensis have been found on St. Croix (see Pl. III, fig. 4), and one poorly preserved specimen which seems to be 0. aguadillensis comes from the upper Oligocene Anguilla limestone of Anguilla. In Santo Domingo this species has been collected at widely separated localities; it is fairly abundant but poorly preserved in the Cevicos limestone (upper Oligocene) near the east end of the Cibao Valley, and excellent specimens have been obtained from beds supposed to be of Miocene age at two localities in the valley of Rio Yaque del Sur. The stratigraphic range of Orthaulax aguadillensis appears to be upper Oligocene and Miocene."


  • Cooke, 1922
  • Maury, 1920. Scientific survey of Porto Rico and the Virgin Islands, vol. 3, pt. 1, p. 58, pl. 9, fig. 4, New York Acad. Sci.

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