CATALOG OF ORIGINAL DESCRIPTIONS: Blefuscuiana multicamerata 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 multicamerata
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 multicamerata

Citation: Blefuscuiana multicamerata Banner and Desai 1988
Rank: Species
Type locality: Speeton Cliff, Filey Bay, North Yorkshire;
Type level: Sample 8103, upper Leupoldina cabri zone, Late Aptian.
Holotype Repository: London, UK; NHM
Holotype number: P52090

Current identification/main database link: Hedbergella occulta Longoria 1974


Original Description: Test a low trochospire; spiral side flat or slightly concave, of two or three whorls, with about eight chambers in later whorls; chambers initially reniform and slightly depressed, becoming subglobular with growth. Intercameral sutures are subradial and distinctly but not deeply depressed on both the spiral and umbilical sides. The umbilicus has a breadth equal to about 20% of the test diameter; it is open and shallow. The aperture is a very low slit extending from the umbilicus to the periphery of the preceding whorl; it is furnished with a narrow porticus which broadens rapidly into a subtriangular flap at its posterior end. Relict apertures and their portical flaps are visible in the umbilicus for about half of the last whorl; the portical flaps are separate and not fused distally. The surface of the test is smooth, and not muricate; it is uniformly microperforate; the external diameters of the microperforations vary from about 0.008 mm on the umbilical side to about 0.0 mm on the spiral side.

Extra details from original publication: Derivation of name. Multicamerata, many chambers.

Remarks. No other known species of Blefuscuiana has as many chambers per whorl as B. multicamerata. This, together with its widely open umbilicus, subglobular chambers and lack of a tendency to pseudoplanospirality, distinguishes it from all species described by Longoria (1974) and other authors known to us. The specimens called “Ticinella aff. bejaouaensis Sigal” by Gorbachik (1986, pl. 20, figs. 2, 3, Early Aptian, Mangishlak) may be related; they are smooth and microperforate, but have fewer chambers, curved intercameral sutures on the spiral side, and long portical flaps. The multichambered last whorls of B. multicamerata appear to be parallelled only in certain planospiral species referable to Globigerinelloides (e.g., G. barri (Bolli et al.), G. macrocameratus Longoria, G. algerianus (Cushman and tenDam), which do not apper to be directly related to B. multicamerata.

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 multicamerata compiled by the pforams@mikrotax project team viewed: 23-10-2017

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