Heterostegina reticulata tronensis, Less & Özcan & Papazzoni & Stockar, 2008

Less, György, Özcan, Ercan, Papazzoni, Cesare A. & Stockar, Rudolf, 2008, The middle to late Eocene evolution of nummulitid foraminifer Heterostegina in the Western Tethys, Acta Palaeontologica Polonica 53 (2), pp. 317-350 : 335

Heterostegina reticulata tronensis ssp. nov.

Figs. 11J–L, N–R, 12A, B.

1999 Heterostegina reticulata multifida ( Bieda, 1949) ; Stockar 1999:

6, pl. 1: 3; pl. 3: 7. 2007 Heterostegina reticulata tronensis ssp. nov.; Özcan et al. 2007:

pl. 1: 15.

Derivation of the name: Named after the type locality of the taxon.

Holotype: MÁFI E. 9510 ( Fig. 11N), a megalospheric specimen split along the equatorial plane.

Type locality: Vic ( Spain), La Trona.

Type horizon: Middle late Bartonian, SBZ 18 B.

Material.—62 well−preserved megalospheric specimens.

Diagnosis.— Heterostegina reticulata populations with X mean exceeding 17.

The equatorial section of A−forms.—The chamberlets are of rhomboid to polygonal shape; their arrangement is somewhat irregular. For numerical features see Table 5.

Remarks.—This name has been preliminarily used by Özcan et al. (2007) for the population from sample Keçili 11, however, with no description, so the taxon is introduced formally here. Stockar’s (1999) figures illustrate the specimens from sample Prella 5. This population is re−evaluated in this paper and based on its parameters it is classified in synonymy with the present subspecies.

Geographic and stratigraphic distribution.—Middle late Bartonian (SBZ 18 B) of Spain (Vic, La Trona), Hungary (sample Úrhida 1), Eastern Anatolia, Turkey (the upper larger foraminiferal horizon in Keçili, sample Keçili 11), and Switzerland (sample Prella 5).