CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia menardii neoflexuosa Srinivasan, Kennett, & Be 1974
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Citation: Globorotalia menardii neoflexuosa Srinivasan, Kennett, & Be 1974Taxonomic rank: sub-speciesType specimens: Holotype is USNM No. 189935: Paratypes are USNM Nos. 189936-189940. 3 paratypes, Plate 1, Figs. a-c of Bé and McIntyre (1970): were collected afive in 0--1000 m plankton sample, Anton Bruun Cruise 1-60-306 (17°54'N, 86°31'E), northern Indian Ocean. 2 paratypes, Plate 1, Figs. d and e of Bé and McIntyre (1970): collected at same location as the holotype.Type age (chronostrat): Plankton - collected liveType locality: 0-275 m plankton sample, Anton Bruun Cruise 6-335A-7201 (04°02'N, 65°03'E) northern Indian Ocean, Plate 1, Fig. f of Bé and McIntyre (1970).Type repository: Washington; USNM
Original Description Test fairly large, rounded in peripheral view, rather compressed, consists of about three whorls of fairly rapidly enlarging chambers arranged in a very low trochospire. There are about eight chambers present in the last whorl. In dorsal aspect the chambers are weakly inflated and are little, if at all, embracing; the chambers are nearly as broad radially as they are long circumferentially; the final and penultimate chambers are strongly twisted toward the umbilical side. The dorsal sutures are gently depressed and are thickened, the thickening appearing to be continuous with the imperforate peripheral keel. In ventral aspect the chambers are sub-triangular and are slightly inflated. The ventral sutures are depressed and nearly radial. Umbilicus small, open and deep. The primary aperture extends the full length of the ventral base of the final chamber and is bordered by a broad lip. The wall is finely perforated, except on the dorsal sutures and the peripheral keel. The surface of the test is smooth except for the weakly pustulose areas on the ventral side surrounding the umbilical shoulder Size: Maximum length of the holotype: 1.3 mm Extra details from original publication Remarks. G. menardii neoflexuosa new subspecies differs from G. menardii menardii by the characteristically twisted last chamber towards the umbilical side. G. tumida flexuosa (Koch), which also exhibits the flexuose character, differs from G. menardii neoflexuosa in typically possessing the tumid test and by the presence of a massive keel and calcite crust in the early part of the test. Distribution. G. menardii neoflexuosa new subspecies first appears in the late Pleistocene interglacial periods (V and X episodes) in the Atlantic and in the Gulf of Mexico. It is also known from the Recent northern Indian Ocean, and appears to be the latest offshoot from the virile Globorotalia menardii-Globorotalia tumida stock. The subspecies may have developed in isolation in the northern Indian Ocean. On the other hand, as suggested by Bé and McIntyre (1970), the flexuose northern Indian Ocean form may also be a phenotypic variant of G. menardii related to distinct oceanographic conditions in that area. A biostratigraphic study of cores from the northern Indian Ocean is required to determine the nature of its origin in this region.
References:
Bé, A. W. H. & McIntyre, A. (1970). Bé, A. W. H. & McIntyre, A. (1970). Globorotalia menardii flexuosa (Koch): An 'extinct' foraminiferal subspecies living in the northern Indian Ocean. Deep-Sea Research. 17: 595-601. Deep-Sea Research. 17: 595-601. gs
Srinivasan, M. S., Kennett, J. P. & Bé, A. , W. H. (1974). Srinivasan, M. S., Kennett, J. P. & Bé, A. , W. H. (1974). Globorotalia menardii neoflexuosa: a new subspecies from the northern Indian Ocean. Deep-Sea Research. 21: 321-324. Deep-Sea Research. 21: 321-324. gs
Globorotalia menardii neoflexuosa compiled by the pforams@mikrotax project teamviewed: 18-6-2025
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