Raskyella peckii var. caliciformis (Soulíe-M¨arsche, 1974)

Trabelsi, Khaled, Sames, Benjamin, Wagreich, Michael, K ́ azm ́, Miklos, , Andrea Mindszen & Mart ́ ın-Clo, d Carles, 2021, A new diverse charophyte flora and biozonation of the Eocene bauxite cover-sequence at G ant (V ertes Hills, Hungary), Journal of Systematic Palaeontology 19 (7), pp. 541-563 : 546-547

Raskyella peckii var. caliciformis (Soulíe-M¨arsche, 1974) comb. nov. Trabelsi & Mart́ın-Closas

( Fig. 3I–P)

Basionym. Raskyella caliciformis Soulíe-M¨arsche, 1974, 114, text-fig. 2 (pl. I, figs 1–5).

1974 Raskyella caliciformis sp. nov. Soulíe-M¨arsche: 112, pl. 1, figs 1–5.

1981 Raskyella caliciformis Anadon & Feist : pl. 1, figs 6, 7; pl. 2, figs 7, 8.

Material. Sixty-three gyrogonites in sample G-2.5. Collection numbers of figured specimens: HNHM-PBO 1509–1516.

Description. Large sized gyrogonites (650–1000 M m high and 750–1050 M m wide) of globular to oblate shape ( ISI 80–105), showing laterally 6–9 (usually eight) convolutions ( Fig. 5). Spiral cells flat to slightly concave ornamented with stout, vertical to slightly inclined, well individualized tubercles ( Fig. 3I, K), which are the main diagnostic character of this variety. Apex broadly rounded to truncated showing five opercular cells placed at the end of the spiral cells. The opercular cells are sometimes convex and somewhat polygonal in shape ( Fig. 3N), rather than rounded, which is the reason why the dehiscence opening appears sometimes irregularly star-shaped ( Fig. 3O), rather than rose-shaped ( Fig. 3L), as already noted by Soulí e-M ¨arsche (1974) in the type material. The internal cast of the gyrogonite ( Fig. 3M) shows straight ridges perpendicular to the well-marked, undulated spiral cells. This wavy surface is uncommon in the inside of other raskyellacean gyrogonites and is thought to correspond internally to the external tubercle ornamentation.

Distribution. This is the first record of R. peckii var. caliciformis in Hungary. It was previously described from the Bartonian of south France (Soulíe-M¨arsche 1974; Riveline 1986), and from the lower Bartonian (Auversian local stage) of the Ebro Basin, Catalonia, Spain (Anadon & Feist 1981; Anadon et al. 1992).