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Linked specimens: USNM-219440
The initial portion of the trochospire is composed of very small chambers, and is rounded. Its sutures are not discernible because they are masked by shell substance.
The chambers of the following three whorls increase rapidly in size from whorl to whorl, but only gradually within the same whorl. The sutures are distinct and strongly depressed. This depression of the sutures and the subglobular, in radial direction somewhat flattened,chambers produce a lobate outline in umbilical, spiral and side views. The umbilicus is deep, open and exposes the apertures of the penultimate and ante penultimate chambers. The umbilical sides of the chambers are flattened and extend into pustulate, triangular tooth like extensions like those found in Globoquadrina altispira altispira (Cushman and Jarvis),1936. The large umbilical aperture shows a thin,smooth border on both sides of the triangular extensions, which may be heavily pustulate as shown by the scanning micrograph (Plate 22, Figure 1). The heavy calcareous wall is perforate, with pore openings of up to 10 microns in diameter. The surface is pustulate.Individual, elongate, distally blunt to pointed pustules occur above the more finely pustulate portion of the
flattened apertural face. These pustules fuse along their bases, and in the course of growth from four to six sided angular compartments each with a deeply set wall pore in its center. This polygonal meshwork is well developed on the first and second chambers of the final whorl.
Extra details from original publication
Globoquadrina altispira conica compiled by the pforams@mikrotax project team viewed: 7-8-2022
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