Catalog - Pseudoguembelitria blakenosensis Catalog - Pseudoguembelitria blakenosensis

CATALOG OF ORIGINAL DESCRIPTIONS: Pseudoguembelitria blakenosensis Huber & Leckie 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 -> P -> Pseudoguembelitria -> Pseudoguembelitria blakenosensis
Other pages this level: P. blakenosensis

Pseudoguembelitria blakenosensis

Citation: Pseudoguembelitria blakenosensis Huber & Leckie 2011
taxonomic rank: Species
Type specimens: Holotype (USNM 540915) and paratypes (USNM 540916, 540917).
Type sample (& lithostrat): 1049C-12X-5, 0–2 cm
Type age (chronostrat): Hd. infracretacea Zone
Type locality: Blske Nose, N. Atlantic, ODPsite 1049
Type repository: Washington; USNM

Linked specimens: USNM-540915 USNM-540917 USNM-540916

Current identification/main database link: Pseudoguembelitria blakenosensis Huber & Leckie 2011

Original Description

Test wall microperforate, circular pores 0.3 to 0.7 um, surface with weakly developed and randomly scattered perforation cones, small pustules may occur in the umbilical region. Test small, globular with early hedbergellid stage, overall diameter/width ratio averaging 1.14; chambers increasing gradually to moderately in size, 11 to 13 coiled in a variable trochospire, 4.5 to 5.0 subglobular chambers in the initial whorl and three to four globular chambers in the final whorl; sutures are depressed, straight to slightly curved; aperture is a low to moderate, semicircular interiomarginal arch at the base of the final chamber, without periapertural structures.

Holotype: height 100 µm, breadth 90 µm; paratypes: height 100–126 µm, width 86–102 µm.

Named for Blake Nose, a promontory on Blake Plateau, which is the only location where the species has been identified.

Extra details from original publication
Remarks. Pseudoguembelitria blakenosensis is different from other Cretaceous planktic foraminifer species in showing a significant reduction in the number of chambers per whorl as chamber inflation increases. Similarities of the early ontogeny and the perforation cone wall texture Fig. 5.1d) to Hedbergella infracretacea (Glaessner) indicate that these species may be phylogenetically related. Since both species appear together in the oldest sediments cored at Blake Nose and Ps. blakenosensis has not been identified at any other site, it is not possible to determine when the species evolved and what its ancestor was. At Site 1049 Ps. blakenosensis becomes extinct at the same level as Para- ticinella eubejaouaensis and several Aptian hedbergellids species. Guembelitria sergipensis Koutsoukos is triserial throughout and it has more inflated chambers and a distinctly higher, pointed spire.

Phylogenetic relationships. It is not clear what species should be considered as ancestral to Ps. blakenosensis although it is likely to be a species of Hedbergella; a descendant is not presently known.

Stratigraphic range. From the Hd. infracretacea Zone through Pa. eubejaouaensis Zone (upper Aptian) at Site 1049 on Blake Nose (Figs. 6, 7; Table 1).

Geographic distribution. Found only in the upper Aptian of ODP Site 1049 on Blake Nose (subtropical western North Atlantic).

Stable isotope paleobiology. Recorded with d18O values that are comparable to co-occurring benthic species and d13C values that are similar to co-occurring planktic species, indicating growth in a relatively deep planktic habitat or peak reproduction during cooler seasonal temperatures (Fig. 8; Table 5).


Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs


Pseudoguembelitria blakenosensis compiled by the pforams@mikrotax project team viewed: 26-2-2024

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