Hastigerinoides alexanderi
Classification: pf_mesozoic -> Globigerinelloididae -> Hastigerinoides -> Hastigerinoides alexanderi
Sister taxa: H. alexanderi, H. atlanticus, H. clavatus, H. sp.
Cushman 1946 pl. 61 fig. 4.jpg
Cushman 1946 pl. 61 figs. 5-7.jpg
Georgescu and Huber 2008_1f4-112.JPG
Masters 1977_12f6-7-112.JPG
Taxonomy
holotype: H. alexanderi
holotype: H. alexanderi
holotype: H. alexanderi
holotype: H. alexanderi
holotype: H. alexanderi
paratype: H. alexanderi
paratype: H. alexanderi
topotype: H. alexanderi
topotype: H. alexanderi
topotype: H. alexanderi
topotype: H. alexanderi
Original description: "Test nearly planispiral, the early chambers largely concealed from both sides; chambers greatly expanded in the adult coil, consisting typically of 6 chambers, but occasionally only 5, the earliest ones subglobular, but quickly expanding and greatly elongating, tapering rathe uniformly to a pointed outer end; suturs distinct, slightly depressed; wall nearly smooth, or finely hispid; aperture nearly at the peripheral margin at the base of the chambers, with a very slight lip."
Entries in the Catalog of original descriptions: Hastigerinella alexanderi
Emended description:
Character matrix
| test outline: | Stellate | chamber arrangement: | Planispiral | edge view: | Hourglass | aperture: | Equatorial |
| sp chamber shape: | Elongate | coiling axis: | Very low | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Elongate | umbilicus: | Narrow | periph margin shape: | Subangular | accessory apertures: | Relict |
| spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
| umbilical or test sutures: | Moderately depressed | final-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:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Hastigerinoides
Cushman, J. A. (1931a). Hastigerinella and other interesting foraminifera from the Upper Cretaceous of Texas. Contributions from the Cushman Laboratory for Foraminiferal Research. 7(4): 17-19. 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 Masters, B. A. (1977a). Mesozoic planktonic foraminifera. In, Ramsay, A. T. S. (ed.) Oceanic Micropaleontology. Academic Press, London 1: 301-731. gsReferences:
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Hastigerinoides alexanderi compiled by the pforams@mikrotax project team viewed: 17-12-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110230 Go to Archive.is to create a permanent copy of this page - citation notes |
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