Stylophyllopsis fritillus (Fromentel & Ferry, 1866)

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1267

Stylophyllopsis fritillus (Fromentel & Ferry, 1866)

( Fig. 55 )

Montlivaltia fritillus Fromentel & Ferry, 1866: 143 , pl. 24, fig. 1, 1a.

Montlivaltia laxa Fromentel & Ferry, 1867: 151 , pl. 35, fig. 3.

Plesiophyllum laxa – Alloiteau 1952: 605, fig. 51; 1957: 112, pl. 5, fig. 10, fig. 70.

Axosmilia fritillus – Alloiteau 1952: 642, fig. 98.

Axosmiliopsis fritillus – Alloiteau 1957: 113, pl. 5, fig. 18, fig. 72.

Plesiophyllum ferry [sic] Alloiteau, 1957: 112, fig. 71.

Plesiophyllum fritillus – Vasseur 2018: 292-293, fig. 3.76.

TYPE MATERIAL. — Holotype MNHN.F. M03502 , Fromentel & Ferry 1866: 143, pl. 24, fig. 1a.

ETYMOLOGY. — In latin fritillus designates a cylindro-conical cup used for dice roll. It is a name and not an adjective. This is the reason why we do not make an agreement between fritillus and the neutral gender of the genus name in the new combination.

TYPE HORIZON. — Pliensbachian . TYPE LOCALITY. — May-sur-Orne, France. STUDIED SAMPLES. — Three specimens: holotypeMNHN.F. M03502 ; MNHN.F. M03520 , CPUN AM16179-6. GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of May-sur-Orne ( Calvados , France).

DESCRIPTION

Solitary subcylindrical coral. Calice subcircular with moderately large and deep, eccentric fossa. Radial elements are slightly exsert, compact, free, straight, slightly curved or even bent (costo-?) septa. Septa show regular variation of their thickness from the center to the periphery. Distal edge poorly ornamented by some regular wide festoons corresponding to the variations in thickness. Lateral faces show the subvertical orientation of these thicker and thinner bands. Hexameral symmetry not very regular. Bilateral symmetry visible with curvature of septa and eccentricity. Endotheca with tabuloid thick dissepiments. Wall of unknown nature but peripheral in position. Epitheca s.l. present.

Calicular diameter: 14 to 20 mm – Number of septa: approximately 30 to 40? – Septal density: 2 per 2 mm.

REMARK

Small rows of granules evoked in the fig. 70 of Alloiteau (1957) were not seen and the angle of thick and thin bands with vertical is obviously exaggerated.

Figures

FIG. 55. — Stylophyllopsis fritillus (Fromentel & Ferry, 1866): A, lateral view of the specimen MNHN.F.M03520; B, distal view of the specimen MNHN.F.M03520; C, lateral view of the specimen CPUN AM16179-6; D, polished sections of the specimen MNHN.F.M03520; E, distal view of the specimen CPUN AM16179-6; F, lateral view of the holotype MNHN.F.M03502; G, distal view of the holotype MNHN.F.M03502; H, polished transverse section of the holotype MNHN.F.M03502; I, transverse thin section of the specimen CPUN AM16179-6;J, printing of the holotype MNHN.F.M03502 (transverse section).Scale bars:A,B, 5 mm; C, F,G,1 cm; D, E, H, I, 4 mm; J, 3 mm.