CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana lapparenti depressa Eternod-Olvera 1959
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Citation: Globotruncana lapparenti depressa Eternod-Olvera 1959Taxonomic rank: sub-speciesType sample (& lithostrat): Méndez Formation; 1203-1206.5 m. in well Bustos No. 1Type age (chronostrat): Upper Cretaceous. Campanian-Maastrichtian Type locality: Well Bustos No. 1, 24.70 km. S 12° E of Tampico, Tamaulipas State, Mexico.Type repository: Mexico City; Laboratory of Paleontology of Petróleos Mexicanos. Mexico City, Mexico
Original Description Testa grande, calcárea, finamente perforada, biconvexa, comprimida, trocospiral con dos quillas muy finas. Lado espiral apenas convexo formado por dos y media vueltas, la última ele las cuales consta ele cinco cámaras semilunares. alargadas. Suturas salientes, imbricadas, granulosas. Lado umbilical ligeramente convexo, con cámaras aplanadas, imbricadas: suturas sigmoidales, ligeramente granulosas. Area umbilical grande. Abertura interiomarginal, poco visible. Superficie de la testa lisa. Periferia lobulada. Size: Diámetro mayor 0.604 mm.; diámetro menor 0.557 mm.
Extra details from original publication Observaciones. - Es muy semejante a Globotruncana lapparenticoronata Bolli, pero en ésta el número de cámaras es mayor y no presentan la forma semilunar ele las cámaras del lado espiral tan caracten'sticas ele ésta nueva subespecie. Se distingue de G. linnei angusticarinata Gandolfi, porque en ésta el lado espiral es más convexo. Esta subespecie es poco abundante dentro de la formación Ménclez del área estudiada y sus principales características son el tener un gran tamaño, la testa muy comprimida y las cámaras semilunares muy alargadas sobre el lado espiral
References:
Eternod Olvera, Y. (1959). Foraminíferos del Cretácico Superior de la cuenca de Tampico-Tuxpan, Mexico. Boletin de la Asociación Mexicana de Geologos Petroleros. 11: 61-134. gs
Globotruncana lapparenti depressa compiled by the pforams@mikrotax project teamviewed: 20-3-2025
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