CATALOG OF ORIGINAL DESCRIPTIONS: Paraspiroplecta Georgescu and Abramovich 2008

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.


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Paraspiroplecta

Citation: Paraspiroplecta Georgescu and Abramovich 2008
Rank: Genus
Type locality: USA (Texas, New Jersey), northern Africa (Tunisia), Israel and North Atlantic Ocean (Blake Plateau, Sohm Basin, Gulf of Guinea).
Type age: Upper Campanian-Maastrichtian (from the Radotruncana calcarata Biozone throughout “Pseudoguembelina” hariaensis Biozone).

Current identification/main database link:


Original Description

Type species: Heterohelix navarroensis Loeblich, 1951, p. 107, pl. 12, figs 1-3.

Diagnosis.– Test with early planispiral coil and weak test wall flexure on the periphery of the earlier portion of the test.

Description.– Test with early planispiral coil and biserial in the adult stage. Earlier chambers are globular, those of the adult stage subglobular. Periphery slightly subangular with a weak test wall flexure developed mostly on the cham- bers of the earlier portion of the test. Aperture is a low to medium high arch at the base of the last formed chamber. Two small, symmetrical flanges border the aperture on the lateral sides. Chamber surface is costate and with orna- mentation thickenings in the proximity of the ‘zigzag’ suture on the earlier chambers. Test wall calcitic, hyaline, finely perforate to macroperforate.


Etymology: The Greek prefix “para” (= opposed to) is added to the pre-existing serial planktonic foraminiferal genus name Spiroplecta.

Extra details from original publication

Remarks.– Paraspiroplecta nov. gen. differs from Hendersonia nov. gen. by the presence of the early planispiral coil. Spiroplecta Ehrenberg, 1844 presents more globular chambers, which can be best seen in the edge view, and has smaller pores (0.7 to 1.3 µm rather than 1.5-3.2 µm). These suggest that Spiroplecta is apparently a descendant from a species of the Heterohelix globulosa (Ehrenberg,1840) group.
Species included.– Heterohelix navarroensis Loeblich, p.107, Pl. 12, Figs. 1-3.

Phylogenetic relationships.– Paraspiroplecta  nov. gen. evolved from Hendersonia nov. gen. It became extinct in the proximity of the Cretaceous/Tertiary boundary leaving no descendants (Fig. 4).

References:

Georgescu, M.D. & Abramovich, S., (2008). Taxonomic revision and phylogenetic classification of the Late Cretaceous (upper Santonian-Maastrichtian) serial planktonic foraminifera (Familiy Heterohelicidae Cushman, 1927) with peripheral test wall flexure. Revista Española de Micropaleontología, 40: 97-114.


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Paraspiroplecta compiled by the pforams@mikrotax project team viewed: 17-10-2018

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