CATALOG OF ORIGINAL DESCRIPTIONS: Praeglobotruncana pseudoalgeriana Falzoni et al., 2016

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 -> Praeglobotruncana -> Praeglobotruncana pseudoalgeriana
Other pages this level: P. algeriana, P. barbui, P. biconvexa gigantea, P. bronnimanni, P. clotensis, P. coarctata, P. compressa, P. crassa, P. gigantea, P. hagni, P. hansbollii, P. hessi compressiformis, P. hessi hessi, P. hilalensis, P. inermis, P. klausi, P. lehmanni, P. loeblichae, P. mattsoni, P. modesta, P. oraviensis, P. oraviensis trigona, P. pauliani, P. prahovae, P. primitiva, P. pseudoalgeriana, P. rohri, P. shirakinensis, P. stephani gibba

Praeglobotruncana pseudoalgeriana

Citation: Praeglobotruncana pseudoalgeriana Falzoni et al., 2016
Rank: Species
Type locality: Clot Chevalier, Vocontian Basin (France, SE).
Type age (chronostrat): Uppermost Cenomanian (W. archaeocretacea Zone)
Type sample (& lithostrat): holotype from sample SLT 570, paratype A from sample SLT 570, paratype B from sample SLT 2370.
Type specimens: Micro-Unimi 1991
Type repository: Milan, Italy; Collection of the Laboratory of Micropaleontology, University of Milan

Current identification/main database link: Praeglobotruncana pseudoalgeriana Falzoni et al., 2016


Original Description
Low to medium height trochospiral test, macroperforate wall; oval to circular outline, asymmetrical lateral profile with convex spiral side and slightly concave umbilical side; pinched margin; equatorial periphery at the beginning of the last whorl with randomly distributed pustules in primitive specimens; advanced specimens show two alignments of pustules separated by a relatively narrow imperforate peripheral band; four to five chambers in the last whorl. Spiral side with globular chambers in the inner whorl and petaloid to crescentic chambers moderately to rapidly increasing in size in the last whorl; chamber surface pustulose and slightly inflated; sutures curved, raised and marked by alignments of pustules in the inner whorl, weakly raised to depressed in the final whorl. Umbilical side with globular chambers; chamber surface inflated and pustulose; sutures straight and depressed. Primary aperture extraumbilicaleumbilical, umbilical area rather small about 1/4 of the maximum diameter.

Etymology: Named for its resemblance to specimens erroneously assigned to Praeglobotruncana algeriana.

Extra details from original publication
Synonymy:
Distnguishing features
Differs from Praeglobotruncana algeriana by being smaller, by possessing fewer chambers in the last whorl, a more pustulose wall texture, spiral depressed sutures in the final whorl, globular chambers on the umbilical side and a smaller umbilical area. Moreover, chamber size increases more regularly in P. pseudoalgeriana and shows a much reduced morphological variability compared to P. algeriana. It resembles Dicarinella roddai but differs in lacking a thick double row of pustules or double-keeled periphery and raised and keeled spiral sutures throughout the last whorl. It can be distinguished from Whiteinella inornata, as the latter species possesses depressed spiral sutures in the innerwhorl and a perforate equatorial periphery without rows of pustules. It differs from P. kalaati Gonzalez-Donoso and Linares (in Robaszynski et al., 1990), as the latter species is single-keeled throughout the last whorl and has a smoother test surface.

Remarks
Morphotypes assigned to P. pseudoalgeriana have been considered to fall within the range of variability of P. algeriana by several authors according to Robaszynski et al. (1979), who figured specimens resembling P. pseudoalgeriana as topotypes of P. algeriana. Thin-section images of specimens that fall within the range of variability of P. pseudoalgeriana were also figured by Premoli Silva and Sliter (1995) under the name of P. algeriana, and their lowest occurrencewas used to identify the base of the middle-to-upper Cenomanian P. algeriana subzone. However, P. pseudoalgeriana shows a number of different and distinctive morphological features compared to P. algeriana that in our opinion justify its accommodation in a different species. It is worth noting that we observed the transition from primitive specimens with randomly distributed pustules on the equatorial periphery (Praeglobotruncana like) to advanced specimens showing two alignments of pustules separated by an imperforate peripheral band (Dicarinella like). Pending further studies, the species pseudoalgeriana is herein tentatively accommodated in the genus Praeglobotruncana, because we have observed the same evolution of the equatorial periphery across the time interval studied in several other species [e.g., P. stephani, P. gibba] traditionally assigned to the genus Praeglobotruncana.

References:

Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs


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Praeglobotruncana pseudoalgeriana compiled by the pforams@mikrotax project team viewed: 26-10-2020

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