CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana mitra Banner and Desai 1988

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 -> B -> Blefuscuiana -> Blefuscuiana mitra
Other pages this level: B. albiana, B. aptiana depressa, B. aptiana implana, B. aptiana orientalis, B. daminiae, B. excelsa cumulus, B. globigerinelloides lobulata, B. hexacamerata, B. kuznetsovae, B. laculata, B. laculata alobata, B. laculata laculata, B. mitra, B. multicamerata, B. occulta perforocculta, B. occulta quinquecamerata, B. praesimilis, B. rudis, B. speetonensis, B. speetonensis tunisiensis, B. whittakeri,

Blefuscuiana mitra

Citation: Blefuscuiana mitra Banner and Desai 1988
Rank: Species
Type locality: Speeton Cliff, Filey Bay, North Yorkshire
Type level: Sample 8109, Leupoldina cabri zone, Late Aptian.
Holotype Repository: London, UK; NHM
Holotype number: Holotype. BMNH P52089. Material. BMNH P52087-88.

Current identification/main database link: Hedbergella mitra (Banner and Desai, 1988)


Original Description
The test is a low trochospire with five to six chambers in each of three whorls. The spiral side is evolute and flat; the chambers are normally subglobular, only the last one or two becoming radially subovoid and with increasingly depressed sutures. The intercameral sutures are subradial on both the spiral and umbilical sides. The umbilicus has a breadth equal to about 20% of the test diameter. The aperture is a low arch extending from the umbilicus to the periphery of the previous whorl and extending over it into the spiral suture in the last formed chamber; the aperture has a porticus extending from the umbilicus (where it is broadest) to the periphery but not beyond it. The surface of the test is smooth and microperforate (external perforations about 0.6 microns in diameter); a narrow imperforate zone may be present in the spiral suture where the aperture encroaches on to the spiral side.

Etymology: Mitra, a mitre, or turban-like head-dress; with reference to the shape of the last formed chambers.

Extra details from original publication
Remarks. Like B. speetonensis, B. mitra shows a tendency towards planispirality in the last few chambers but it is distinguished by its smaller umbilicus, consistently more globular chambers, which are typically fewer in each whorl, and by the high, cowl-like or mitre-like doming of the last chambers (which never leads to elongation as in Lilliputianella).

We have not been able to identify this species with any previously described, but specimens found by Obregon (1959) from the Late Aptian cabri zone of Mexico may be conspecific (they are not referable to Globigerina infracetacea; compare Glaessner, 1966).

References:

Banner, F.T. & Desai, D., (1988). A review and revision of the Jurassic-Early Cretaceous Globigerinina,with especial reference to the Aptian assemblages of Speeton (North Yorkshire, England). Journal of Micropaleontology, 7: 143-185.


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Blefuscuiana mitra compiled by the pforams@mikrotax project team viewed: 11-12-2017

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