CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides semiinvolutus Keijzer 1945

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 -> G -> Globigerinoides -> Globigerinoides semiinvolutus
Other pages this level: << < G. quadrilobatus hystricosus, G. quadrilobatus praeimmaturus, G. quadrilobatus primordius, G. ruber albus, G. ruber parkeri, G. rubra seigliei, G. rubriformis, G. sacculifer brachysacculifer, G. sacculifer minimus, G. sacculifer spinulosus, G. sacculifera subsacculifera, G. sacculiferoides, G. sacculiferus immatura, G. sacculiferus irregularis, G. semiinvoluta, G. semiinvolutus, G. sicanus, G. sicanus praesicanus, G. subconglobatus micra, G. subconglobatus subconglobata, G. subquadrata, G. subquadratus praesubquadratus, G. subquadratus subelongatus, G. suleki, G. tapiesi, G. tenella, G. transitoria, G. triloba altiapertura, G. triloba aspera, G. trilobus bullatus, G. tyrrhenicus

Globigerinoides semiinvolutus

Citation: Globigerinoides semiinvolutus Keijzer 1945
Rank: species
Type 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 age (chronostrat): Upper Eocene
Type specimens: pl. 4, fig. 58, holotype, X 50: Fig. 58a-e, views from different angles, as shown in f.
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


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 team viewed: 14-5-2021

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Comments (1)

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Citation should be "semiinvolutus" no hyphen according to the ICZN CODE

Jeremy Young (Tonbridge, UK)

corrected, thanks Jeremy

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