CATALOG OF ORIGINAL DESCRIPTIONS: Praeglobotruncana shirakinensis Hasegawa 1999

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> P -> Praeglobotruncana -> Praeglobotruncana shirakinensis
Other pages this level: P. algeriana, P. barbui, P. biconvexa gigantea, P. clotensis, P. coarctata, P. compressa, P. crassa, P. gigantea, P. hagni, P. hansbollii, P. hessi compressiformis, P. hessi hessi, P. hilalensis, P. inermis, P. klausi, P. lehmanni, P. loeblichae, P. mattsoni, P. modesta, P. oraviensis, P. oraviensis trigona, P. pauliani, P. prahovae, P. primitiva, P. pseudoalgeriana, P. rohri, P. shirakinensis, P. stephani gibba,

Praeglobotruncana shirakinensis

Citation: Praeglobotruncana shirakinensis Hasegawa 1999
Rank: Species
Type locality: Ohyubari area, Hokkaido, Japan (43 degrees 2.60'N, 142 degrees 9.77'E)
Type age: Upper Cenomanian
Type sample and level: sample SEN 210, lower part of the Takinosawa Formation.
Holotype Repository: Tohoku, Japan; Institute of Geology & Paleontology, Tohoku University, Sendai, Japan
Type & figured specimens: IGPS 102523
Description on pages: 184

Current identification/main database link: Praeglobotruncana shirakinensis Hasegawa 1999


Original Description
Diagnosis.- A medium trochospiral species of Praeglobotruncana with about 5 moderately compressed and slightly lobulated chambers of last whorl.

Description.- Test of medium size, medium trochospiral, equatorial periphery slightly lobulate; chambers initiallly inflated and globigerine-like, later ones becoming petaloidal on dorsal side, trapezoidal in shape on ventral side, about 10 to 12 chambers in all arranged into about 2.5 whorls, enlaraging gradually in size as added, about 5 slightly compressed chambers in final whorl, with a perpheral band formed of an aligned concentration of pustules paralleling periphery; sutures on dorsal side curved, raised and beaded, ventrally radial or slightly curved, depressed; umbilicus shallow and narrow, its width about 1/4 of maximum diameter of test; primary aperture bordered by a wide distinct lip, interiomarginal, umbilical-extraumbilical, extending nearly halfway to periphery; wall calcareous, with marked accumulation of pustules on early chambers.

Size: Maximum diameter of holotype 0.38 mm, maximum thickness 0.20 mm.

Etymology: With reference to the type locality (the Shirakin River) where the holotype specimen occurred.

Extra details from original publication
Praeglobotruncana sp. Leckie, 1985, p. 139 149, pi. 3, figs 9-15.

Remarks. This species resembles Praeglobotruncana stephani, but differs in the following characters: spirally slightly elongated and ventrally more inflated chambers of the last whorl ; fewer chambers (normally 4 to 5) having almost similar size in the last whorl ; less lobulated periphery ; and thinner spiral sutures. An intermediate form between P. inermis and P. shirakinensis is also figured (Figure 5.7).

References:

Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

Hasegawa, T. (1999). Planktonic foraminifera and biochronology of the Cenomanian-Turonian (Cretaceous) sequence in the Ohyubari area, Hokkaido, Japan. Paleontological Research. 3: 173-192. gs


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Praeglobotruncana shirakinensis compiled by the pforams@mikrotax project team viewed: 22-1-2020

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