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Catalog - Globoquadrina himiensisCatalog - Globoquadrina himiensis
CATALOG OF ORIGINAL DESCRIPTIONS: Globoquadrina himiensis Maiya, Saito, & Sato 1976
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Citation: Globoquadrina himiensis Maiya, Saito, & Sato 1976Taxonomic rank: speciesType sample (& lithostrat): Sample N-YB-65; lower part of the Yabuta Formation;Type age (chronostrat): PlioceneType locality: sea cliff on the eastern coast of Noto Peninsula, about 1 km, north of Ozaki. Himi City. Toyama Prefecture; JapanType repository: Tokyo, Japan; National Science Museum
Original Description Test free, large, coiled in a low trochospire, with 14 to 15 chambers in all arranged in nearly three whorls, with four and one-half to five in the final whorl; earlier whorls distinctly high trochospiral, protrud ing conically on the spiral side; chambers subspherical to ovate, gradually increasing in size; equatorial periphery distinctly, lobulate, equatorial profile subquadrate; axial profile broadly rounded; sutures of both spiral and umbil ical sides distinctly depressed, nearly radial to slightly curved; umbilicus well marked, deep, and widely open; aperture interiomarginal, nearly umbilical-extraumbilical, low arch with a distinct toothlike flap; wall calcareous, uniformly and coarsely pitted. Size: Maximum diameters: Holotype (plate 4, figures 1a-1c) 0.50 mm.; paratype (plate 4, figures 2a-2c) 0.50 mm.
Extra details from original publication Remarks: This species differs from Globoquadrina kagaensis, n, sp., in having a deeper and more widely open umbilicus, an aperture approaching umbilical extraumbilical in position, and a subquadrate to subrhomboidal equatorial profile, lt is also distinguished from Globoquadrina eggeri (Rhumbler) by the fact that its last whorl consists of no more than five chambers, instead of the five and one-half to six chambers in G. eggeri, its very high conical earlier whorls, and its apertural arch which is concave toward the periphery. In contrast. G. eggeri has an apertural arch which is convex toward the periphery. In general appearance it also resembles Globigerina helicina d'Orbigny as figured by Banner and Blow (1960), particularly in having conically protruded earlier whorls. Globoquadrina himiensis is distinguished, however, by its much more widely open umbilicus and the trochospiral arrangement of chambers which is highly conical only in the earl ier whorls.
References:
Maiya, S., Saito, T. & Sato, T. (1976). Late Cenozoic planktonic foraminiferal biostratigraphy of northwest Pacific sedimentary sequences. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology. Micropaleontology Press, New York 395-422. gs
Globoquadrina himiensis compiled by the pforams@mikrotax project teamviewed: 21-1-2025
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