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.
Current identification:
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. 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. 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).
Original Description
Size:
Etymology:
Extra details from original publication
Species included.– Heterohelix navarroensis Loeblich, p.107, Pl. 12, Figs. 1-3.
Editors' Notes
Georgescu, M. D. & Abramovich, S. (2008b). 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. gs V OReferences:
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Paraspiroplecta compiled by the pforams@mikrotax project team viewed: 6-2-2023
Short stable page link: https://mikrotax.org/pforams/index.php?id=131930 Go to Archive.is to create a permanent copy of this page - citation notes |
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