CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia ikebei Maiya, Saito, & Sato 1976
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 ikebei Maiya, Saito, & Sato 1976Taxonomic rank: speciesType sample (& lithostrat): Japan Petroleum Exploration Company, Araya SK-1 well, from ditch -cutting samples at 130 m. Shiiya Formation.Type age (chronostrat): PlioceneType locality: Near Niigata, Honshu, JapanType repository: Tokyo, Japan; National Science Museum
Current identification:
Original Description Test free, low trochospiral, moderately biconvex, nearly flat to slightly convex on the spiral side, slightly vaulted on the umbilical side; equatorial periphery broadly circular, slightly lobulate, without carina or pseudocarina; axial periphery broadly rounded. somewhat tapering off in the direction of last chamber; chambers increasing slowly in size as added. 11 to 13 chambers in adult arranged in nearly two and one-half whorls, usually five in the final whorl; sutures of the spiral side slightly depressed and gently curved; sutures of the umbilical side depressed. slightly sinuous to rad ial ; wall calcareous. finely perforate. in many cases with distinct pustules covering the umbilical surface of the earlier chambers; aperture low-arched and elongate, interiomarginal, umbilical-extraumbilical, surrounded by a concave or inwardly warped apertural face, but rimmed by no apparent lip. Size: Holotype (plate 1, figures 4a-4c), 0.52 mm.; paratype (plate 1, figure 3), 0.41 mm. Extra details from original publication Remarks: This species differs from Globorotalia miozea miozea Finlay in having less strongly curved sutures on the spiral side and less tangentially elongate chambers. The periphery is broadly rounded in Globorotalia ikebei as compared with the more acute periphery of G. miozea miozea. It also differs from Globorotalia adamantea Saito and Globorotalia orientalis Maiya, Saito. and Sato, n. sp., in having an axial periphery gently tapering off in the direction of the last chamber and in having a more subcircular equatorial profile.
Occurrences: From the uppermost part of the Globorotalia ikebei/Orbulina universa Zone to the lowermost part of the Globigerina pachyderma (dextral)/Gioborotalia orientalis Zone. it occurs in the Shiiya Formation of Niigata Prefecture and in the uppermost part of the Funakawa Formation. southern part of Akita Prefecture.
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
Globorotalia ikebei compiled by the pforams@mikrotax project teamviewed: 8-2-2026
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