Longoria, J. F.; Gamper, M. A. (1984). Subfamily Helvetiellinae, a New Group of Late Cretaceous (Maastrichtian) Planktonic Foraminifera. Micropaleontology. 30(2): 171-179.

284900

10.2307/1485716 [view]

Longoria, J. F.; Gamper, M. A.

1984

30(2): 171-179

Publication

Available for editors  

Collections of Late Cretaceous (Maastrichtian) planktonic foraminifera from several regions, including Central Mexico, the Caribbean, Europe (Scandinavia, Austria), and the South Atlantic Ocean, contain a rich assemblage of the trochoidal superfamily Hedbergellacea with roughened test surfaces. The Helvetiellinae, n. subfam., is herein erected to include all Hedbergellacea characterized by this spinosopapillate test ornamentation, with two genera, Helvetiella, n. gen. and Bucherina Brönnimann and Brown. Helvetiellids appear to be restricted to Late Maastrichtian time, and are generally associated with Abathomphalus mayaroensis (Bolli). However, they are more abundant in cool-water faunas and thus can be used to correlate warm (tropical) and cool-water assemblages during Late Cretaceous time. The origin of helvetiellids remains uncertain; it may be that they originate from a rugoglobigerinid ancestor of early Late Maastrichtian age.

RIS (EndNote, Reference Manager, ProCite, RefWorks)
BibTex (BibDesk, LaTeX)

[Back to search]