CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides semiinvolutus Keijzer 1945
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Citation: Globigerinoides semiinvolutus Keijzer 1945Taxonomic rank: speciesType specimens: pl. 4, fig. 58, holotype, X 50: Fig. 58a-e, views from different angles, as shown in f.Type age (chronostrat): Upper EoceneType locality: Locality F286, about 10 km east of Mayari on the road to Teneme, on the north side of the Sierra del Cristal, southern rim of the basin of Santa Isabel de Nipe, eastern part of the Province of Oriente, Cuba (east of 76° W.long.). Other localities given: H 400, about 10 km north of San Benito, north side of the San Luis-Guantanamo basin; R 276, about 3 km west of Tiguabos on the road to Almeida, and V 339, about 1 km north of Almeida on the road to Tiguabos, northwest side of the Sierra de Canasta, central part of the San Luis-Guantanamo basin; and R 283, about 3 km northeast of Limones on the road to Guantanamo, southeast side of the Sierra de Canasta, southeastern part of the San Luis-Guantanamo basin, eastern part of the Province of Oriente, Cuba.Type repository: Depository not given. [Lectotype, probably Keijzer's holotype specimen, selected from a series of twenty-three specimens identified by Keijzer and kept together in a slide labelled by him "Globigerinoides semiinvolutus Keijzer; Cuba D 26798; F286, V339, Y 400," designated, described, and illustrated by Bolli (1972, Jour. Foram. Res., vol. 2, no. 3, pp. 120, 121 , 131, 132; p. 117, tfs. 72-76) as Globigerinatheka semiinvoluta (Keijzer); remounted on a separate slide and Geological Institute, University of Utrecht, Utrecht, Netherlands.]
Current identification:
Original Description "Test spherical, distinctly perforate, chambers spirally arranged, very rapidly increasing in size as added and greatly overlapping. The last chamber bears three almost circular apertures, situated along the inner margin of the last chamber and separated from each other by about 90 arc degrees. Sutures only slightly depressed and chambers hardly, if at all, inflated. In well-preserved faunae, the species can easily be recognized by its very large ultimate chamber and the three conspicuous circular apertures. Size: Diameter ranging between 0.37 and 0.55 mm. Extra details from original publication "The species differs from Globigerinoides mexicanus (Cushman) [Globigerina mexicana, 1925] by its much larger last chamber, less chambers (3) in the last whorl, and larger apertures. G. conglobatus (Brady) (Brady, 1884, Challenger Exped. 1873-76, p. 603, pl. 80, figs. 1-5; pl. 82, fig. 5 [as Globigerina conglobata]) has much more constricted sutures which typically intersect at right angles and a relatively smaller terminal chamber. Moreover the apertures of that species are situated more inside the deeply incised sutural depressions. In the same respects it differs from G. conglobatus (Brady) var., described above [Keijzer, op. cit., p. 206]. The characters of G.? orbiformis (Cole) [Globigerina orbiformis, 1927] cannot be made out with sufficient accuracy to allow comparison, but the general shape is decidedly different. G. sp. (Nuttall) (1930, Jour. Pal., vol. 4, p. 290, pl. 24, figs. 12-15 [as Globigerina sp.]) has much more inflated chambers." Editors' Notes Orthography - published as semi-involutus but this is automatcally corrected to semiinvolutus under ICZN rules
References:
Keijzer, F. G. (1945). Outline of the geology of the eastern part of the Province of Oriente, Cuba (E of 76° W.L.), with notes on the geology of other parts of the island. Publicaties uit het Geographisch en uit het Mineralogisch-Geologisch Instituut der Rijksuniversiteit te Utrecht, Physiographisch-Geologische Reeks, ser II,. 6: 1-239. gs
Globigerinoides semiinvolutus compiled by the pforams@mikrotax project teamviewed: 13-8-2026
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François
105
Mar 2018
François
Citation should be "semiinvolutus" no hyphen according to the ICZN CODE
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Keijzer 1945 4-58a-c.jpg
Keijzer 1945 4-58d-e.jpg
Keijzer 1945 4-58a-c.jpg
Keijzer 1945 4-58d-e.jpg
Comments (2)
Citation should be "semiinvolutus" no hyphen according to the ICZN CODE
corrected, thanks Jeremy