CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina paratriloculinoides Hofker 1956
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Citation: Globigerina paratriloculinoides Hofker 1956Rank: speciesType specimens: Text-fig. 99; P4918Type sample (& lithostrat): an unnamed formation unconformably underlying the Upper Eocene San Mateo formation : in white tuffaceous shale (neritic facies).Type age (chronostrat): PaleoceneType locality: Quarry on the hillside north of the Manta-Portoviejo road between the 22 km. and 23 km. posts, 14 km. due west of Portoviejo, Ma nabí Province, west-central Ecuador.Type repository: Washington; USNM
Original Description All chambers visible on the dorsal side, only those of the last whorl visible on the ventral side, reaching almost to the center but leaving a small umbilical cavity free. Chambers fairly inflated toward both sides, increasing slowly in length, with a ratio of 1.1 or 1.2 : 1 between successive chambers. Surface smooth; pore-index 5-1.5, X 500 (an average of five pores per square centimeter, with an average diameter of 1.5 mm, at a magnification of 500X). Aperture a narrow opening at the umbilical cavity. This species somewhat resembles Globigerina triloculinoides Plummer, but differs from topotypes of that species in the total lack of any honeycomb ornamentation. Size: Test of medium size, the diameters 0.42 mm. and 0.36 mm., thickness 0.24 mm.
References:
Hofker, J. (1956e). Tertiary foraminifera of coastal Ecuador; Part II - Additional notes on the Eocene species. Journal of Paleontology. 30(4): 891-958. gs
Globigerina paratriloculinoides compiled by the pforams@mikrotax project teamviewed: 31-3-2023
Hofker 1956-Ecuador tf99.JPG
Hofker 1956-Ecuador tf99.JPG
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