Catalog - Globigerina bradyi

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Globigerina bradyi

Citation: Globigerina bradyi Wiesner 1931

Type locality: Challenger Station 144

Type repository: London, UK; NHM (lectotype)

Description of lectotype. The test is small, elongate, coiled in a high trochospire. The minute spherical proloculum is surrounded by a tightly embracing, comparatively low trochospiral whorl of 4 to 5 chambers; this is succeeded by about 3 whorls of slowly enlarging, subglobular, slightly embracing chambers arranged four to a whorl in a trochospire which becomes elongate along its axis. After the initial whorl, the spiral and intercameral sutures become increasingly deeply depressed and the equatorial and axial peripheries become increasingly lobulate. The umbilicus is small and usually completely closed. The primary aperture is a low interiomarginal, umbilical arch. The wall is thin, sometimes almost translucent, and is uniformly and finely perforate. The surface of the test is virtually smooth and with little trace of hispidity. [Banner & Blow 1960]

Maximum dimension of lectotype: 0.25 mm [Banner & Blow 1960]

BANNER & BLOW (1960)
Wiesner (1931) proposed the name Globigerina bradyi for a minute high spired species of Globigerina, first recorded and figured (but not named) by Brady (1884) from the "Challenger"" Collections made in the Southern Ocean (Challenger Station 144), and subsequently found by himself also in the Southern Ocean in the vicinity of Crozet Island. Both the specimens illustrated by Brady (1884), referred to by Wiesner, and the specimens actually seen by the latter worker must constitute the syntypic series upon which the concept of this species was based. At our request, Dr. Kurt Diebel, of the Geologisch-Palaontologisches Institut und Museum der Humboldt Universitat zu Berlin, has kindly searched through the H. Wiesner collections in collaboration with Dr. Gruner, the Curator of the Zoologische Museum der Universitat. He has informed us that all material of the species G. bradyi is missing (letter dated 29th July, 1959). Consequently we have selected as lectotype of Globigerina bradyi Wiesner that specimen illustrated by Brady in 1884, pl. 82, figure 8, and refigured here (pI. 3, fig. 1); this specimen was obtained from Challenger Station 144, depth 1570 fathoms, and is registered in the British Museum (Natural History) as specimen number 1959.5.11.738.

In 1861, Ehrenberg (pp. 276, 277, 308) described a minute elongate globigerine for which the name Pylodexia uvula was proposed; the specimens came from the Greenland Deep of the Northern Atlantic Ocean in the vicinity of Southern Greenland. Ehrenberg subsequently published illustrations of this form (1873,pi. 2, figs. 24, 25); these specimens were evidently mounted in Canada Balsam (Ehrenberg's usual practice) and drawn using transmitted light. We illustrate here (pI. 3, fig. 2) a topotype specimen of G. bradyi similarly mounted in Canada Balsam and photographed in transmitted light. Ehrenberg's (1873) figure 25 is reproduced here for comparison and it seems highly likely that G. bradyi Wiesner should be regarded as a junior synonym of Pylodexia uvula Ehrenberg."

References:

Banner, F. T. & Blow, W. H. (1960a). Some primary types of species belonging to the superfamily Globigerinaceae. Contributions from the Cushman Foundation for Foraminiferal Research. 11: 1-41. gs O

Wiesner, H. (1931). Die Foraminiferen. In, Drygalski, E. , von (ed.) Deutsche Südpolar Expedition 1901-1903, Bd. 20. W. de Gruyter, Leipzig 53-165. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina bradyi Wiesner 1931

Globigerina bradyi

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