 Hornibrook et al. 1989, Fig. 24.20a-c (Holotype): 0.57 mm |
Reference: Hornibrook, Brazier & Strong 1989, p.130, Fig. 24:20a-c (Holotype).
Synonymy: 1939, Globorotalia crater, Trans. Roy. Soc. N.Z. 69(1): 125;
1958, Hornibrook, Micropaleontology 4(1): 33, pl. 1, fig. 3-5;
1971, Jenkins, N.Z. Geol. Surv. paleont. bull. 42: 103, 104, pl. 8, fig. 192-197 (Truncorotalia).
Description: Distinguished by the markedly plano-conical form, with a spinose keel and a wide umbilicus surrounded by strongly muricate (not true spines) distal ends of chambers; five chambers in final whorl, aperture a low arch.
Distribution: Mangaorapan to Heretaungan.
Comment: G. (M.) velascoensis recorded by Jenkins (1971) from the Waipawan in the Middle Waipara section, is almost identical except for the smoother test. It is a worldwide key species for Upper Paleocene. G. crater is closely related to G. caucasica Glaessner. During the period of rapid diversification of planktic foraminifera in the Upper Paleocene and Lower Eocene many such species of planoconical, umbilicate form (Morozovella) developed as one of the most distinctive elements of the fauna.
Cite this publication as: "Strong CP, Raine JI, Terezow M. 2018. Key
species of New Zealand fossil foraminifera: descriptions from "Manual of New
Zealand Permian to Pleistocene Foraminiferal Biostratigraphy" by Hornibrook,
Brazier and Strong, 1989. Lower Hutt (NZ): GNS Science. (GNS Science
miscellaneous series; 123)."
ISSN 1172-2886, ISBN 978-1-98-853088-8,
DOI 10.21420/G2M63W.
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