pforams@mikrotax - Hastigerinoides clavatus pforams@mikrotax - Hastigerinoides clavatus

Hastigerinoides clavatus


Classification: pf_mesozoic -> Globigerinelloididae -> Hastigerinoides -> Hastigerinoides clavatus
Sister taxa: H. alexanderi, H. atlanticus, H. clavatus, H. sp.

Taxonomy

Citation: Hastigerinoides clavatus (Bronnimann, 1952)
taxonomic rank: Species
Basionym: Globigerinella escheri clavata
Taxonomic discussion: The combination Hastigerinoides clavata (Bronnimann, 1952) was proposed by Georgescu & Huber, 2008. The spelling is corrected here to H. clavatus since  Hastigerinoides should be teated as a masculine noun following ICZN Art. 30.1

Type images:

Original description: The test is similar to that of Globigerinella escheri escheri, except that the end chamber, occasionally also the penultimate one, is distinctly prolonged in radial direction, thus producing in lateral view a broad ellipsoid, non-tapering outline.

Entries in the Catalog of original descriptions: Globigerinella escheri clavata


Emended description:

Georgescu & Huber, 2008, p.57: "Test completely planispiral, biumbilicate. Chambers increase moderately in size as added, 4.5 to 5.5 chambers in the final whorl, earlier chambers globular and last-formed one to three chambers clavate. Sutures are straight, depressed and radial. Periphery broadly rounded without peripheral structures. Primary aperture is a medium-high to high arch that is equatorial in position and extends into the umbilici, and bordered by a lip. Relict apertures can be present in the umbilical areas. Scattered pustules commonly present on all the chambers of the test, more numerous on the earlier ones due to the successive addition of calcite layers. Test wall calcitic, hyaline, finely perforate; pore diameter ranges between 0.9 and 1.5 microns." [copied from Chronos database]

Character matrix
test outline:Ovatechamber arrangement:Planispiraledge view:Hourglassaperture:Equatorial
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:umbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:Relict
spiral sutures:N/Aumb depth:N/Awall texture:Finely pustuloseshell porosity:Finely Perforate: 1-2.5µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.5 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within D. asymetrica zone (83.65-85.60Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within D. concavata zone (85.60-89.75Ma, base in Turonian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

References:

Brönnimann, P. (1952c). Globigerinidae from the Upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad, B. W. I. Bulletins of American Paleontology. 34(140): 1-70. gs

Georgescu, M. D. & Huber, B. T. (2008). Taxonomic re-evaluation and phylogeny of the stellate planktonic foraminiferal genus Hastigerinoides Brönnimann, 1952. Journal of Foraminiferal Research. 38: 52-58. gs

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Hastigerinoides clavatus compiled by the pforams@mikrotax project team viewed: 9-9-2024

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Comments (4)

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Le Coze

It should be clavatus if the genus is masculine (see H. antlanticus by the same team as clavata)..

Georgescu, M.D.; Huber, B.T. (2008). Taxonomic re-evaluation and phylogeny of the stellate planktonic foraminiferal genus Hastigerinoides Brönnimann, 1952. Journal of Foraminferal Research. 38: 52-58., available online at https://doi.org/10.2113/gsjfr.38.1.52

DURA LEX SED LEX

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Jeremy Young(UK)

Agreed the gender should be consistent - but do we know which gender is correct for this genus?

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Le Coze

30.1.4.4. A compound genus-group name ending in the suffix -ites, -oides, -ides, -odes, or -istes is to be treated as masculine unless its author, when establishing the name, stated that it had another gender or treated it as such by combining it with an adjectival species-group name in another gender form.

Brönnimann (1952) did not give any indication about the gender of his new subgenus. The two species he mentionned H. alexanderi and H. rohri n. sp. do not give any indication about the gender. Therefore the general rule apply.

Ref.: original description Brönnimann, P. T. (1952). Globigerinidae from the upper Cretaceous (Cenomanian-Maestrichtian) of Trinidad,, B.W.I. Bulletin of American paleontology. 34: 5-71., available online at http://www.biodiversitylibrary.org/item/40529#page/17/

page(s): pp. 52, 10-11

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Jeremy Young(UK)

Ok that seems pretty definitive to me.