Catalog - Pseudoguembelina palpebra

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Pseudoguembelina palpebra

Citation: Pseudoguembelina palpebra Bronnimann and Brown 1953

Type locality: Construction pit of the Gran Templo Nacional Masonico, at the northwest corner of Belascoain (Padre Varela) Avenue and Carlos III Drive, Havana, Cuba. P. palpebra has been observed only from its type locality.

Type age (chronostrat): Maastrichtian

Type repository: Washington; USNM

Original Description
"This medium-sized test is composed of 5-8 pairs of chambers which rapidly increase in size in the direction of growth. The pointed initial end consists of as many as 5 pairs of small chambers. In later development the chambers are considerably larger and more inflated. However, in many specimens the ultimate pair of chambers displays strong lateral compression. The pointed initial stage is entire or unlobated in lateral view; the later development is distinctly lobated. The sutures are flush in the early stage, and impressed in the later stage. Surface markings are indistinct or absent in the early stage; later well-developed longitudinal striae parallel the contour of the chambers. In the ultimate pair of chambers these striae are more numerous but somewhat fainter. The principal aperture is a relatively large semilunar opening at the base of the inner margin of the ultimate chamber. It is bordered by a liplike rim. Relatively large accessory apertures are developed in the later stage. Each chamber in the later stage possesses 2 conspicuous accessory apertures, one on each side, directly over the crest of the subjacent chamber. The flaps of the accessory apertures resemble small eyelids. Small papillae form a granular area above the flaps and near the median line."

References:

Brönnimann, P. & Brown, N. K. (1953). Observations on some planktonic Heterohelicidae from the Upper Cretaceous of Cuba. Contributions from the Cushman Foundation for Foraminiferal Research. 4(4): 150-156. gs V O

CATALOG OF ORIGINAL DESCRIPTIONS: Pseudoguembelina palpebra Bronnimann and Brown 1953

Pseudoguembelina palpebra

References:

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