Catalog - Huberella yucatanensis Catalog - Huberella yucatanensis

CATALOG OF ORIGINAL DESCRIPTIONS: Huberella yucatanensis Georgescu 2011, in Georgescu et al. 2011

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 -> H -> Huberella -> Huberella yucatanensis
Other pages this level: H. huberi, H. praehuberi, H. yucatanensis

Huberella yucatanensis

Citation: Huberella yucatanensis Georgescu 2011, in Georgescu et al. 2011
taxonomic rank: Species
Type specimens: Plate 1, figures 10–14; Holotype: WKB 010073; Paratypes: Five specimens, WKB 010074–010078.
Type sample (& lithostrat): DSDP 95-16-5 100.5-102cm
Type age (chronostrat): Coniacian (D. concavata Biozone).
Type locality: Yucatan outer shelf, offshore Mexico; 24° 09.00' N and 86° 23.85' W.

Current identification:


Original Description

Diagnosis: Huberella with thin, solid leptocostae; last formed chambers with incipient backward extension.

Description
: Test is biserial throughout, composed of 13 to 14 chambers that are alternately added with respect to the test growth axis and increase gradually in size. Earlier chambers are subglobular, then subrectangular and the last ones reniform; chambers are tilted with respect to the test growth axis. The last one or two chambers have incipiently developed backward extension, which is attached to the previous chamber in the row. Sutures are distinct and depressed, oblique to the test growth axis; the sutures between the early–formed chambers are straight, whereas those between the last–formed chambers are curved due to the development of the chamber backward extension. Periphery is rounded and without peripheral structures. Aperture is a low to, rarely, medium high arch at the base of the last formed chamber. It is bordered by two symmetrically developed orthoflanges and there is no periapertural pustulose area. Chambers are ornamented with discontinuous solid leptocostae (2.6–4.1μm in thickness). Test wall is calcitic, hyaline and perforate (pore diameter 0.6–1.0μm).

Size:
Dimensions of the holotype: Length: L=0.232 mm; width: W=0.141 mm; W/L=0.608; thickness: T=0.070 mm; T/L=0.302; apical angle: A=44°.

Extra details from original publication
Remarks: Huberella yucatanensis differs from its ancestor, H. praehuberi, by having a test composed of fewer chambers, 13 to 14 rather than 14 to 17 chambers, and ornamentation consisting of solid rather than granular leptocostae. It differs from H. huberi by having incipient rather than well–developed chamber backward extension and ornamentation consisting of solid rather than granular leptocostae.

Stratigraphic range: Uppermost Turonian–Coniacian (lower part of D. concavata Biozone).

Geographic distribution: Yucatan outer shelf (Caribbean region).

References:

Georgescu, M. D., Quinney, A. E. & Anderson, K. D. (2011). New data on the taxonomy, evolution and biostratigraphical significance of the Turonian–Coniacian (Late Cretaceous) planktic foraminifer Huberella Georgescu 2007. Micropaleontology. 57: 247-254. gs


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Huberella yucatanensis compiled by the pforams@mikrotax project team viewed: 16-9-2024

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