CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia adamantea Saito 1963
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.
Citation: Globorotalia adamantea Saito 1963Taxonomic rank: speciesType specimens: Pl. 54, figs. 4a-5c; Holotype, IGPS coll. cat. no. 79033; paratype, IGPS coll. cat. no. 79034; other ten unfigured paratypes; all from the sample Nz-1, of the Numazawa formation, Yamagata Prefecture.Type sample (& lithostrat): sample Nz-1, of the Numazawa formationType age (chronostrat): MioceneType locality: Yamagata Prefecture; Japan
Current identification:
Original Description Test low trochospiral, rather spiroconvex, occasionally biconvex, earlier whorl with high tightly coiled trochospire, umbilical side slightly concave, equatorial periphery lobulated with sub-rhomboidal outline, axial periphery rounded, three to four whorls visibleon spiral side; chambers moderately inflated, longer than broad, elongate tangentially inspiral view, increasing gradually in size as added, five chambers in initial whorl, four or some-times five in final one, up to 17-18; sutures depressed, slightly curved on spiral side, radial to slightly sinuous on umbilical side; wall calcareous, perforate, fairly thick with pittedsurface; aperture very low arch without distinct lip umbilical-extraumbilical, extending from shallow umbilical area to test margin; sometimes developed at base of final chamber around umbilicus, pustules. Coiling of the test nearly random. Size: Maximum diameter of holotype 0.54 mm., thickness 0.30 mm. Other specimens
range from 0.24 to 0.54 mm. in maximum diameter. Extra details from original publication Remarks: This is a species showing rather Globigerina-like inflated chambers. The shape of the chambers change from inflated subglobular to axially somewhat compressed, and in axial profile from narrowly to broadly rounded. In general outline, this species somewhat resembles Globorotalia zealandica Hornibrook, but it differs from the latter in having no vaulted test on umbilical side and very low arched aperture usually with an indistinct lip, and more inflated chambers.
Occurrence and distribution: This species occurs abundantly only at the type locality In association with the typical assemblage of the Globorotalia fohsi fohsi Zone.
References:
Maiya, S., Saito, T. & Sato, T. (1976). 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. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology. Micropaleontology Press, New York 395-422. gs
Saito, T. (1963). Saito, T. (1963). Miocene planktonic foraminifera from Honshu, Japan. Science Reports of the Tohuku University, Series 2 (Geology). 35: 123-209. Science Reports of the Tohoku University. 35: 123-209. gs
Globorotalia adamantea compiled by the pforams@mikrotax project teamviewed: 17-6-2025
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