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.

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Apellániz, E.; Orue-Etxebarría, X.; Luterbacher, H.

2002

225: 157-194

Publication

Evolutionary trends in planktonic foraminifera across the K/T boundary are very well documented in numerous surface sections of the Basque Country (Western Pyrenees). After the massive extinction at the K/T boundary, the polyphyletic radiation of the Paleogene planktonic foraminifera starts from a few survivors which include Heterohelix spp., Guembelitria cretacea, G. trifolia, Hedbergella hillebrandti and H. holmdelensis. A total of nine different evolutionary lineages are recognized within the early Paleocene planktonic foraminifera. The new genus Civisina with its type-species C. euskalherriensis n. sp. is characterised by its aperture wich extends onto the peripheral margin of the youngest chamber. Besides its type-species, it includes also C. longiapertura which is kept separate from Parvularugoglobigerina eugubina.

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