This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.
Current identification:
Original Description
Description.– Tests low trochospiral, with chambers that increase gradually in size. Chambers of the juvenile stage globular; last formed ones radially elongated, subcylindrical or dorso-ventrally compressed in edge view and with the elongation axis perpendicular or at a high angle (> 85°) to the previous whorl. Sutures are distinct and depressed, often limbate due to the lack of chamber overlapping. Periphery is rounded and simple. Aperture is a low to medium high arch, umbilical-peripheral in position and bordered by an imperforate lip; relict periapertural structures and apertures can occur in the umbilicus. Chamber surface of the earlier species ornamented with dome-like scattered pustules, denser on the earlier chambers; evolved species are mostly smooth. Test wall calcitic, hyaline and perforate; pores show gradual increase in size along the lineage.
Etymology:
Extra details from original publication
Species included.
Stratigraphical range.– Upper Cenomanian-lowermost Turonian (from the R. cushmani Biozone to W. archaeocretacea Biozone).
Geographic distribution.– USA (Georgia, Kansas, Texas, Washington State, Wyoming), Canada (Manitoba and southern Saskatchewan) and northern Africa (Egypt).
Georgescu, M. D. (2009d). Upper Albian-lower Turonian non-schackoinid planktic foraminifera with elongate chambers: morphology reevaluation, taxonomy and evolutionary classification. Revista Española de Micropaleontología. 41: 255-293. gs References:
Pessagnoina compiled by the pforams@mikrotax project team viewed: 5-11-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=131942 Go to Archive.is to create a permanent copy of this page - citation notes |
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