Gillismilia fromenteli (Alloiteau, 1956)

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1256-1258

Gillismilia fromenteli (Alloiteau, 1956)

( Fig. 48 )

Palaeocyathus fromenteli Alloiteau, 1956 : Pal univ. n°86, fig.1-2.

Gillismilia fromenteli – Lathuilière et al. 2017: 141, pl. 1, fig. 6-8.

Gillismilia fromenteli – Vasseur 2018: 212-213, fig. 3.44.

TYPE MATERIAL. — Holotype: MNHN.F. M03524 , Alloiteau 1956a: Pal univ. n°86, fig. 1-2. TYPE HORIZON. — Pliensbachian . TYPE LOCALITY. — May-sur-Orne, France. STUDIED SAMPLE. — Holotype MNHN.F. M03524 . GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of May sur Orne ( Calvados ; France).

DESCRIPTION

Solitary discoid corallum.Epitheca weakly folded covering a little more than half of the basal face.Calice circular in outline.Radial elements are prominent, compact, straight costo-septa. Distal edge ornamented by some regular wide festoons corresponding to the variations in thickness. No pali but some detached columns. Hexameral symmetry easy to decipher especially with the external part of radial elements. Endotheca not observed. Columella formed by teeth fused to inner edges of S1 septa; other cycles show free septa. Wall parathecal or septothecal.

Calicular diameter: 21.8 mm – Number of septa: approximately 50.

SIMILARITIES AND DIFFERENCES

The external prominence of septa and general morphology distinguishes Gillismilia from other Liassic stylophyllids.

Figures

FIG. 48. — Gillismilia fromenteli (Alloiteau, 1956): A, distal view of the holotype MNHN.F.M03524; B, proximal view of the holotype MNHN.F.M03524; C, lateral view of the holotype MNHN.F.M03524; D, detail of the septal apparatus of the holotype MNHN.F.M03524. Scale bars: A, B, 1 cm; C, D, 5 mm.