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.
Linked specimens: London, UK; NHM (1959.4.13.7)
Current identification/main database link: Globigerinoides conglobatus (Brady, 1879)
Globigerina conglobata, nov. is a large subglobular modification of the " rubra" type, in which the early segments are small and compactly arranged, and the spire convex rather than trochoid the later segments are large, particularly the three forming the final convolution, and disposed so as to give a convex base. The apertures on the superior surface are numerous, and the test is thick and coarsely perforated.
Original Description
Description of lectotype, from Banner & Blow 1960.-The shape of the large test is subglobular to subquadrate. In axial profile the dorsal surface is convex and the axial periphery is broadly rounded. The equatorial periphery is weakly lobate. The chambers are coiled in a fairly low but tight trochospire consisting of approximately three whorls. The chambers are initially reniform but later becoming narrowly lunate in dorsal aspect. The later chambers are characteristically strongly depressed, slightly embracing but moderately inflated. There are about 4½ chambers in the earlier whorls reducing to 3½ chambers in the last whorl. The dorsal spiral and intercameral sutures are initially obscure but become distinctly and narrowly depressed during ontogeny, so much so that the later formed sutures appear deeply incised and the chambers "bevelled." Four chambers are visible ventrally and the sutures between them are distinct, narrowly depressed, slightly sinuous to radial. The umbilicus is small, almost closed, but deep. The apertures are multiple; the distinct primary interiomarginal-umbilical aperture is a fairly long, comparatively low, slightly asymmetric arch broadest posteriorly with respect to the direction of coiling. The dorsal supplementary apertures are sutural in position and are visible in the basal sutures of the chambers of the last whorl and the later part of the penultimate whorl. In the last chamber there are three such supplementary apertures. Both the primary and supplementary apertures of the last chamber are bordered by thickened rim-like lips. The wall is characteristically very thick, especially in the early whorls, and it is uniformly and fairly coarsely perforate. The surface of the test is cancellate and syntypes taken in vivo show it to have been originally finely, uniformly and densely spinose.
Size:
Extra details from original publication
Remarks. This species is considered here to be properly assigned to the genus Globigerinoides Cushman 1927, as restricted by Bolli, Loeblich and Tappan 1957 (see also Banner and Blow, 1959); it possesses a distinct primary umbilical aperture and dorsal supplementary apertures which are sutural in position; these supplementary apertures are not confined to the last chamber only as they are in species of the genus Globigerapsis Bolli, Loeblich and Tappan 1957.
Records of this species in the Eocene (e. g., Subbotina, 1953) are in error and these Eocene forms belong to the genus Globigerapsis Bolli, Loeblich and Tappan. Forms recorded from the Miocene (e. g., Stainforth, 1948) are probably referable to Globigerinoides bisphericus Todd. The form figured by A. G. I. P. Mineraria (1957) is from the Lower Pliocene but the records of this species in the Miocene by A. G. I. P. Mineraria (loc. cit.) are probably in error. This species has only been observed by us in deposits of Pliocene and Pleistocene age as well as in collections from the recent seas. The species has probably evolved from Globigerinoides gomitulus (Seguenza) in the basal Pliocene. [Banner & Blow 1960]"
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Globigerina conglobata compiled by the pforams@mikrotax project team viewed: 11-2-2025
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