CATALOG OF ORIGINAL DESCRIPTIONS: Praeglobotruncana stephani var. gibba Klaus 1960

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.


Higher levels: pf_cat -> P -> Praeglobotruncana -> Praeglobotruncana stephani gibba
Other pages this level: P. algeriana, P. barbui, P. biconvexa gigantea, P. bronnimanni, P. clotensis, P. coarctata, P. compressa, P. crassa, P. gigantea, P. hagni, P. hansbollii, P. hessi compressiformis, P. hessi hessi, P. hilalensis, P. inermis, P. klausi, P. lehmanni, P. loeblichae, P. mattsoni, P. modesta, P. oraviensis, P. oraviensis trigona, P. pauliani, P. prahovae, P. primitiva, P. pseudoalgeriana, P. rohri, P. shirakinensis, P. stephani gibba,

Praeglobotruncana stephani gibba

Citation: Praeglobotruncana stephani var. gibba Klaus 1960
Rank: variety
Holotype Repository: Basel, CH; Institut de Geologie, Universite de Basle, Swisse

Current identification/main database link: Praeglobotruncana gibba (Klaus, 1960)


Original Description
Translated from French: The characters of this variety are those of the type species. However, the spire is higher, and the ratio of the height of the ventral convexity to the combined heights of the spire and ventral convexity is lower. We have not observed an increase in size for the specimens from level 56, we have not noticed the presence of a septal keel in the chambers of the last whorl, and the last chamber does not always feature a marginal keel. Because of the height of the spire in dorsal view, the outline seems less lobate since the dorsal side of the chambers meets the observer's eye obliquely. This variety (the differentiation of which remains a little subjective) represents nearly less than 15% of the Late Cenomanian Praeglobotruncana population (level 56 of the Breggia River section).


Extra details from original publication
Value of the parameters: 0.36 < h/D<0.50, 0.15 < h'/h+h'Dimensions in mm: extreme and most frequent values of main diameter: at level 35, 0.28-0.40 and 0.30-0.35; at level 56, 0.32-0.54 and 0.36-0.40. Extreme and most frequent values of total height: at level 35, 0.16-0.24 and 0.17-0.22; at level 56, 0.18-0.28 and 0.19-0.23. Number of chambers in the last whorl: 5 to 6,5 and 2 to 2,5 (sometimes 3) whorls of spire. Coiling direction: at level 35, 7 dextral specimens, 5 sinistral specimens; at level 56, 18 dextral specimens, 5 sinistral specimens. (D: diameter h: height of the spire h': height of the ventral convexity).

References:

Klaus, J. (1960). Etude biometrique et statistique de quelques especes de Globotruncanides 1. Les especes du genre Praeglobotruncana dans le Cenomanien de la Breggia (Tessin, Suisse meridionale). Eclogae Geologicae Helvetiae. 53(1): 304-. gs


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Praeglobotruncana stephani gibba compiled by the pforams@mikrotax project team viewed: 1-10-2020

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