Catalog - Protentelloides

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Protentelloides

Citation: Protentelloides Zhang & Scott 1995

Type species: Protentelloides dalhousiei Zhang and Scott, 1995

Test free, thick-walled, very low trochospiral in early stage, followed by a tendency to become planispiral in final whorl. Chambers globular in early stages. but molar-shaped in final whorl, increasing rapidly in size as added, greatly inflated at peripheral end, and suddenly flattened in the center of test, with a steep slope half way between the umbilicus and periphery; 4-6 chambers in the final whorl. A bulla-like chamber commonly developed as a final chamber, which varies greatly in shape, from distinct to extremely obscure or absent, more or less equatorially centered. Proloculus and first few initial chambers very small, making the center of test particularly thin. Equatorial periphery lobulate to strongly lobulate, axial periphery broadly rounded. Sutures on both sides simple, almost radial, depressed, straight in early stage; last few intercameral sutures curved to rccurved, limbate but depressed, never flush to the test; in some specimens the sutures are not clear in the widely compressed center (see pl. 1, fig. 6). Aperture varies significantly; type species has a large prolonged aperture that is symmetrical in axial view, linking with primary umbilical-extraumbilical basal aperture, forming somewhat "2-ray" aperture as seen in the Eocene genus Hantkenina, with distinctly projected imper- forate rim and dendritic tooth that creates secondary openings inside the aperture (see pl. 1, figs. 12c and d); however in most specimens 1-3 secondary prolonged or circular openings are irregularly scattered on the areal face of the bulla-like chamber. In primitive forms, the primary aperture is a slit-like opening or a low arch at the ventral base of the bulla-like or extremely reduced chamber. interiomarginal, umbilical-extraumbilical, with a rim. Surface coarsely perforate, cancellate, hexagonal (pl. 1, fig. 1d).

The name Protentelloides was chosen because of the similar chamber arrangement exhibited by Protentella Lipps 1964. The suffix. oides, means "similar".

Remarks: This genus resembles the genus Protentella (Lipps 1964) in chamber arrangement reported from the Monterey Shale, uppermost Luisian, middle Miocene (planktonic foraminiferal Zones N12-14), Southern California, but differs from it in its large prolonged aperture thal is axially symmetrical with distinct rim and dendritic tooth inside the aperture, and bulla-like last chamber with or without secondary areal openings in early forms, molar-shaped chambers, and cancellate surface structure.

Gender: According to ICZN 30.1.4.4. A compound genus-group name ending in the suffix -ites, -oides, -ides, -odes, or -istes is to be treated as masculine unless its author, when establishing the name, stated that it had another gender or treated it as such by combining it with an adjectival species-group name in another gender form.
Zhang & Scott 1995 described two species in the genus - P. dalhousei and P. primitiva. The name dalhousei is based ultimately on the name of a person and so does not agree with the genus. The name primitiva, however, is an adjective and is feminine, hence Zhang & Scott when establishing the name Protentelloides treated it as feminine.

References:

Zhang, J. & Scott, D. B. (1995). New planktonic foraminiferal genus and species from the upper Oligocene, DSDP Hole 366A, Leg 41. Micropaleontology. 41(1): 77-83. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Protentelloides Zhang & Scott 1995

Protentelloides

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			Protentelloides dalhousiei Zhang & Scott 1995 = Protentelloides dalhousiei
			Protentelloides primitiva Zhang & Scott 1995 = Protentelloides primitivus