CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia bermudezi Rögl & Bolli 1973

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 -> G -> Globorotalia -> Globorotalia bermudezi
Other pages this level: << < G. angulata praepentacamerata, G. apanthesma, G. apertura, G. aragonensis, G. aragonensis araratica, G. aragonensis caucasica, G. aragonensis incisimarginata, G. aragonensis twisselmanni, G. archeomenardii, G. armenica, G. australiformis, G. avanensis, G. barisanensis, G. bella, G. berggreni, G. bermudezi, G. berwaliana, G. birnageae, G. bollii, G. bonairensis, G. bononiensis, G. bouregregensis, G. broedermanni lodoensis, G. bullbrooki, G. bykovae, G. bykovae minoritesta, G. californica, G. californica Smith, G. canariensis minima, G. capdevilensis, G. cavernula, > >>

Globorotalia bermudezi

Citation: Globorotalia bermudezi Rögl & Bolli 1973
Rank: species
Type locality: Cariaco Trench, Caribbean Sea, lat 10°42,48'N; long 65°10,48'W.
Type age: Holocene; Globorotalia truncatulinoides truncatulinoides Zone; Globorotalia fimbriata Subzone; Zone Z after Ericson and Wollin.
Type sample and level: DSDP, Leg 15, Site 147-2-1 0cm (4 mbsf)
Holotype Repository: Basel, CH; Natural History Museum
Type & figured specimens: C27087

Current identification/main database link: Globorotalia bermudezi Rögl & Bolli 1973


Original Description
Shape of test low trochospiral, axially strongly compressed, biconvex; equatorial periphery subcircular to slightly elongate, and lobulate; Axial periphery rounded, irregularly biconvex, slightly inflated spiral and more inflated umbilical side; peripheral margin without keel, but with a broad imperforate band. Twelve angled chambers in about two and a half whorls, five chambers in the last whorl. Chambers increase rapidly in size. Sutures distinct, fairly deep, slightly curved, somewhat more so on the spiral side. Umbilicus average sized, deep and open. Aperture a low umbilical - extraumbilical slit with a distinct lip. Wall very thin, transparent, smooth, with small, circular, but not very regularly distributed pores, which are more closely spaced on the umbilical than on the spiral side, where they are more frequent in the peripheral area (Plate 16, Figure 2). Very small and isolated knobs are present on the umbilical side (Plate 6, Figure 17; Plate 16, Figure 2, white spots).

Size: Maximum diameter 0.237 mm; minimum diameter 0.190 mm; height of spira 0.083 mm.

Extra details from original publication
Paratypes: Sixty-four specimens. Leg 15, Site 147, Core 2, Section 1 (top)(NMB C-27086, 27088-95, 27225/1-30); Core 4 (core-catcher)(27225/31-37); Core 11, Section 3 (101-103 cm) (27225/38-45); Core 18 (core-catcher)(27225/46-55).

Dimensions (paratype): Maximum diameter 0.162-0.294 mm; average 0.229 mm; minimum diameter 0.132-0.254 mm; average 0.191 mm; height of spire 0.071-0.137 mm; average 0.103 mm.

Number of chambers (paratype): 10-16; average 12.81.

The coiling mode is somewhat variable with the result that in axial view the spiral side can be slightly concave, plane or convex. The umbilical side is always distinctly convex.

Remarks: Globorotalia bermudezi n. sp. is apparently identical with the Globorotalia sp. described by Reiss et al. (1971) from the Mediterranean. A superficial similarity exists with Globorotalia scitula but the new species has a distinctly more open and deeper umbilicus. Furthermore, the chambers in Globorotalia bermudezi are higher on the umbilical side and more clearly separated. In Globorotalia scitula, the spiral intercameral sutures are much more curved and become almost tangential to the periphery. The wall of the new species is finer and more irregular perforated. Its average size is smaller and it also possesses smaller chambers.

Occurrence: Mostly common throughout Site 147, an indication that the new species lives closer to the surface than Globorotalia scitula which is rare. The new species is also present in the Pleistocene of the Caribbean Sites 148, 149, and 154A, and was reported by Reiss et al. (1971) from Mediterranean Late Pleistocene to Recent.

Range: Pleistocene to Recent, Globorotalia truncatulinoides trauncatulinoides Zone.

References:

Rögl, F. & Bolli, H. M. (1973). Holocene to Pleistocene planktonik foraminifera of LEG 15, site 147 (Cariaco Basin (Trench), Caribbean Sea) and their climatic interpretation. Initial Reports of the Deep Sea Drilling Project. 15: 553-579. gs :: ::


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Globorotalia bermudezi compiled by the pforams@mikrotax project team viewed: 8-8-2020

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