CATALOG OF ORIGINAL DESCRIPTIONS: Rugoglobigerina spinosa Masters 1993
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Citation: Rugoglobigerina spinosa Masters 1993Taxonomic rank: speciesType specimens: 474685Type age (chronostrat): MaastrichtianType locality: Millers Ferry Lock and Dam site at Corps of Engineers Millers Ferry core hole 238; SE1/4,SE1/4, SEC18, 13N, 7E.Type repository: Washington; USNM
Original Description Test a flat trochospire, early whorl often depressed below final whorl; equatorial periphery lobate and axial periphery broadly rounded, the outlines of each interrupted by short pseudospines. Chambers 4.5 to typically 5 well inflated chambers in final whorl; meridionally
oriented costellae generally are not well developed and tend to break up at the periphery to become pseudospines or may be replaced altogether by pustules and pseudospines. Aperture a low, interiomarginal, umbilical-extraumbilical arch. A tegillum covers a moderately wide, shallow umbilicus. Sutures depressed, straight and radial on both sides. Surface entirely perforate except for the tegillum, costellae and pseudospines.
Variation. Toward the periphery, the length of the costellae tends to become shorter and then rapidly breaks up into a broad band consisting of pustules which grade into peripheral pseudospines (PI. 4, Fig. 1). The costellae tend to be best developed on the sides of the chambers (PI. 4, Figs. 3, 7), but even here they may be replaced by pustules (PI. 4, Figs.
4, 6). The zones of costellae and of pseudospines vary in width (PI. 4, Figs. 2, 5, 8). The pseudospines also vary in length, but are typically longest at the periphery when well preserved. Other features are generally stable.
References:
Masters, B. A. (1993). Masters, B. A. (1993). Re-evaluation of the species and subspecies of the genus Plummerita Brönnimann and a new species of Rugoglobigerina Brönnimann (Foraminiferida). Journal of Foraminiferal Research. 23: 267-274. Journal of Foraminiferal Research. 23: 267-274. gs
Rugoglobigerina spinosa compiled by the pforams@mikrotax project teamviewed: 8-7-2025
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