CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina protoreticulata Hofker 1956
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Citation: Globigerina protoreticulata Hofker 1956Rank: SpeciesType specimens: Text-fig. 95; syntypes P4915 (four specimens)Type sample (& lithostrat): Jusá formation, neritic facies. Occurs also in the Upper Eocene, San Mateo formation, radiolarian facies; in light-colored tuffaceous shale overlying white tuff (locality 12). Common.Type age (chronostrat): Syntypes (tf. 95) from the Upper EoceneType locality: Syntypes (tf. 95) from between the two main tributaries of the Rio Jusá 14-15 km. east- southeast of Colonche , 13.5 km. north and 75 km. west from the Plaza del Centenario monument in Guayaguil, Guayas Province, southwestern Ecuador. Found also at locality 12, in outcrops along trails across the Cerro de Hoja running northward from the Manta-Portoviejo road about 15 km. west of Portoviejo, Manabí Province, west-central Ecuado.Type repository: Washington; USNM
Original Description sually 4 chambers in the last-formed whorl, of which the oldest is often scarcely visible from the ventral side. The three last-formed chambers increase in length very regularly, with a ratio of 1.28:1. Chambers very much inflated toward the ventral side, nearly circular in side view. On the dorsal side all chambers are visible, on the ventral side only the last 3 or 4, meeting at the center so that no real umbilicus is formed, only a more or less deep cavity, with an incospicuous rim. Pore-index in the last-formed chambers 2(3)-1(2), X 500 (an average of 2 or 3 pores per square centimeter, with an average diameter of 1 mm. to 2 mm., at a magnification of 500X), but the density of the pores is higher on the earlier chambers, decreasing gradually with growth. The earlier, more porous chambers are ornamented by a distinct honeycomb reticulation, but as usual in this genus, this pattern gradually becomes indistinct on the younger chambers. Size: Test of medium size, greater diameter 0.33-0.45 mm., lesser diameter 0.20-0.36 mm., thickness 0.24-0.33 mm. U Extra details from original publication
Globorotalia centralis Cushman and Bermudez. - Stainforth, 1948, Jour. Pal., vol. 22, no. 2, p. 118.
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 protoreticulata compiled by the pforams@mikrotax project teamviewed: 22-3-2023
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