CATALOG OF ORIGINAL DESCRIPTIONS: Praeglobotruncana compressa 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 compressa
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 compressa

Citation: Praeglobotruncana compressa Hasegawa 1999
Rank: Species
Type locality: Ohyubari area, Hokkaido, Japan (43 degrees 2.60'N, 142 degrees 9.78E)
Type age: Upper Cenomanian
Type sample and level: sample SRN-207, lower part of the Takinosawa Formation
Holotype Repository: Tohoku, Japan; Institute of Geology & Paleontology, Tohoku University, Sendai, Japan
Type & figured specimens: Figs 5/5, 6; Holotype IGPS 102707

Current identification/main database link: Praeglobotruncana compressa Hasegawa 1999


Original Description
Diagnosis.- A low trochospral species of Praeglobotruncana with compressed and wedge- shaped chambers in last whorl.

Description.-Test of medium to small size, very low trochospiral, equatorial periphery slightly lobulate; chambers wedge-shaped on dorsal side, triangular and slightly inflated on ventral side, about 10 chanbers in all, enlarging rapidly in size as added, about 4.5 chambers in last whorl, with a peripheral band formed of aligned pustules; final chamber occasionally obliquely shifted toward umbilical direction; chambers in last whorl diagnostically elongated toward spiral direction; sutures on dorsal side gently curved, depressed, ventrally radial or slightly curved and depressed; umbilicus shallow, medium in size, about 1/3-1/4 of maximum diameter of test, umbilical flaps extending into an umbilicus from each chamber; primary aperture bordered by a narrow lip, interiomarginal, umbilical-extraumbilical; wall calcareous, earlier chambers pustulated.

Size: Maximum diameter of holotype 0.30 mm, maximum thickness 0.10 mm

Etymology: From Latin, compressa referring to the compressed feature of chambers compared with other species of Praeglobotruncana.

Extra details from original publication
Remarks.- This species is distinguished from Praeglobotruncana compressiformis (originally described as Praeglobotruncana hessi compressiformis by Pessagno, 1962) and other species of Praeglobotruncana in possessing wedge-shaped chambers having depressed sutures in the last whorl on the dorsal side, spirally elongated chambers in the last whorl, and in its generally compressed shape.

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, Tokyo. 3: 173-192. gs :: ::


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Praeglobotruncana compressa compiled by the pforams@mikrotax project team viewed: 5-8-2020

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