CATALOG OF ORIGINAL DESCRIPTIONS: Hedbergella kyphoma 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 -> H -> Hedbergella -> Hedbergella kyphoma
Other pages this level: << < H. beegumensis, H. blakensis, H. bollii, H. bornholmensis, H. brittonensis, H. costellata, H. excelsa, H. flandrini, H. gorbachikae, H. hiltermanni, H. hispaniae, H. holmdelensis, H. implicata, H. intermedia, H. kuhryi, H. kyphoma, H. labocaensis, H. lata, H. libyca, H. luterbacheri, H. maslakovae, H. murphyi, H. occulta, H. praelibyca, H. praelippa, H. praetrocoidea, H. pseudotrocoidea, H. punctata, H. quadrata, H. rischi, H. semielongata, > >>

Hedbergella kyphoma

Citation: Hedbergella kyphoma Hasegawa 1999
Rank: Species
Type locality: Ohyubari area, Hokkaido, Japan. (43 degrees 2.50'N, 142 degrees 9.72E)
Type age: Lower Turonian
Type sample and level: sample SRN-525A, lower part of the Takinosawa Formation.
Holotype Repository: Tohoku, Japan; Institute of Geology & Paleontology, Tohoku University, Sendai, Japan
Type & figured specimens: Figs 5/1-4; Holotype IGPS No.102504, paratypes IGPS No. 102505-102507.

Current identification/main database link: Muricohedbergella kyphoma (Hasegawa, 1999)


Original Description
Diagnosis.- A low trochospiral species of Hedbergel/a with last four chambers umbilically shifted, compressed, and spirally elongate. Umbilicus narrow, sutures of last four chambers slightly curved.

Description.-Test of medium size, initially very low trochospiral, later becoming medium trochospiral, equatorial periphery lobulate; chambers initially globular, later slightly compressed and spirally elongated, 11 to 14 in all arranged into 2.5 to 3 whorls, enlarging gradually in size as added except for last 3 or 4 which enlarge irregularly, 6 or 7 in last whorl, last 3 or 4 characteristically elongated, compressed and shifted toward umbilicus, last chamber variable in size and shape; sutures initially radial and depressed on dosal side except for last 3 or 4 chambers in which they are curved, slightly curved and depressed on ventral side; coiling axis initially stable, later rapidly tilted for last 3 or 4 chambers, as a result, initial umbilicus occasionally being covered by last 3 or 4 chambers; umbilicus shallow, very narrow, less than 1/5 of maximum diameter of test; primary aperture bordered by a narrow lip, interiomarginal, umbilical-extraumbilical, extending to periphery; wall calcareous, surface poorly ornamented.

Size: Maximum diameter of holotype 0.36 mm, maximum thickness 0.20 mm

Etymology: From kyphoma, a Greek noun referring to the humpbacked nature of the pattern of chamber growth in this species.

Extra details from original publication
Remarks.- This species resembles Hedbergella planispira (Tappan) in its initially very low trochospiral shape and the number of chambers in the last whorl, but differs from the latter species in having a narrower umbilicus and umbilically shifted and compressed last 3 or 4 chambers.

References:

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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Hedbergella kyphoma compiled by the pforams@mikrotax project team viewed: 22-2-2020

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