CATALOG OF ORIGINAL DESCRIPTIONS: Praeglobotruncana clotensis 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 clotensis
Other pages this level: P. algeriana, P. barbui, P. biconvexa gigantea, 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 clotensis

Citation: Praeglobotruncana clotensis Falzoni et al. 2016
Rank: Species
Type locality: Clot Chevalier (Vocontian Basin, France),
Type age: Lower Turonian (W. archaeocretacea Zone). Holotype from sample SLT 2250, paratype A from sample SLT 2490, paratype B from sample SLT 2550. Type level.
Holotype Repository: Milan; Micropalaeontological Collection, Universita degli Studi di Milano, Dipartimento di Scienze della Terra ÒA. DesioÓ, Italy.
Type & figured specimens: Holotype (Micro-Unimi n. 1994; Fig. 15, 4A-C), paratype A (Micro-Unimi n. 1995; Fig. 15, 5A-C), paratype B (Micro-Unimi n. 1996; Fig. 15, 6A-C)

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


Original Description
Medium to small-sized test, moderately high to high trochospire, macroperforate wall; circular outline, asymmetrical lateral profile with convex spiral side and concave umbilical side; equatorial periphery lobate with two closely spaced rows of pustules or weakly developed keels at least at the beginning of the last whorl, that usually merge in the final chambers; four to five chambers in the last whorl, often cross-shaped and moderately increasing in size as added. Spiral side with crescentic chambers in the last whorl; chamber surface smooth to slightly pustulose and flat; sutures curved and raised. Umbilical side with trapezoidal chambers; chamber surface inflated and more pustulose; sutures straight and depressed. Primary aperture extra-umbilical-umbilical; umbilical area about 1/4 of the maximum diameter.

Etymology: Named for the type locality (Clot Chevalier) where it is found.

Extra details from original publication
Distinguishing features. Differs from P. cf. delrioensis (Fig. 14, 5e6) by having a higher trochospire, an incipient double-keeled periphery and distinctly raised and keeled spiral sutures. Moreover, chambers in P. clotensis are crescentic rather than petaloid on the spiral side. It differs from P. inermis (Fig. 4, 6AeC) by having raised sutures on the spiral side and an incipient double-keeled periphery.

Remarks. specimens here assigned to P. clotensis (Fig. 15, 4e6) do not resemble any specimens figured in the literature. Praeglobotruncana clotensis occurs rarely at Clot Chevalier; however, it possesses very distinctive morphological features that allow its identification. Specimens assigned to P. clotensis possess features that might suggest their accommodation either in the genus Praeglobotruncana or Dicarinella, as noted for P. pseudoalgeriana. For the time being, we have assigned this species to the genus Praeglobotruncana based on the following reasons:
  1. We believe that this species is phyletically closer to P. delrioensis/P. gibba rather than to species of the genus Dicarinella (hagni, roddai, canaliculata, imbricata, etc.); 
  2. Advanced specimens of several other species of this genus [e.g., P. stephani (Fig. 15, 8A-C), P. gibba (Fig. 4, 5A-C)] develop an incipient double-keeled periphery (or double row of pustules) in the early Turonian; therefore, this kind of peripheral margin is not exclusive of the genus Dicarinella
Stratigraphic distribution. Occurs throughout the section at Clot Chevalier (Fig. 3); appearance and disappearance levels are presently not recorded (Fig. 8). Relative abundances. Up to the 5% of the planktonic foraminiferal assemblage >125 µm at Clot Chevalier (Fig. 13).

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 clotensis compiled by the pforams@mikrotax project team viewed: 5-8-2020

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