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Civisina euskalherriensis Apellániz et al. 2002 |
Current identification:
Original Description
Description: The species included in this genus have a trochospiral test. The spiral side varies from flat to moderately convex whereas the umibilical one is distinctly convex. The shape of chambers changes during ontogeny from rounded to somewhat flattened. Sutures between chambers depressed, straight to slightly curved on spiral side, and straight on umbilical side. Axial profile varying from rounded to slightly angular, equatorial profile lobate. Aperture very characteristic, umbilical-extraumbilical, but in final chamber extending onto the peripheral margin. Umbilicus small and rather deep. Surface of test smooth with very small perforations (microperforate). With 5 to 8 chambers in the last whorl.
Size:
Etymology:
Extra details from original publication
Remarks: This new genus includes the species Civisina longiapertura (Blow, 1979) and Civisina euskalherriensis n. sp. Specimens included here into the genus Civisina based on their characteristic aperture have been figured previously but attributed to Globorotalia (Turborotalia) by Blow (1979), to Globigerina by Smit (1982), to Parvularugoglobigerina by Brinkhuis & Zachariasse (1988), Keller et al. (1995), Apellaniz et al. (1997), Olsson et al (1999) and others.
Apellániz, E., Orue-Etxebarría, X. & Luterbacher, H. (2002). Evolution of the early Paleocene planktonic foraminifera: a Basque point of view. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 225: 157-194. gs Blow, W. H. (1979). The Cainozoic Globigerinida: A study of the morphology, taxonomy, evolutionary relationships and stratigraphical distribution of some Globigerinida (mainly Globigerinacea). E. J. Brill, Leiden. 2: 1-1413. gs Brinkhuis, H. & Zachariasse, W. (1988). Dinoflagellate cysts, sea level changes and planktonic foraminifers across the Cretaceous-Tertiary boundary at El Haria, northwest Tunisia. Marine Micropaleontology. 13(2): 153-191. gs Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. (85): 1-252. gs Smit, J. (1982). Extinction and Evolution of planktonic foraminifera after a major impact at the Cretaceous/Tertiary boundary. In, Silver, L. T. & Schultz, P. H. (eds) Geological Implications of Impacts of Large Asteroids and Comets on the Earth, Geological Society of America Special Paper 190. 329-352. gs Missing or ambiguous references: Apellaniz et al. 1997; Keller et al. 1995; References:
Civisina compiled by the pforams@mikrotax project team viewed: 13-10-2024
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