Proleptophyllia granulum (Fromentel & Ferry, 1866)

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1222-1225

Proleptophyllia granulum (Fromentel & Ferry, 1866)

( Fig. 23 )

Montlivaultia granulum Fromentel & Ferry, 1866: 136 , pl. 24, fig. 2.

Montlivaultia arenula Fromentel & Ferry, 1866: 134-135 , pl. 23, fig.4, 4a-b.

Proleptophyllia granulum – Alloiteau 1952: 666; 1956: Pal. Univ., NS. n°121; 1957: 113, pl. 8, fig. 10 and fig. 73. — Vasseur 2018: 297-298, fig. 3.78.

Epiphyllum arenula – Alloiteau 1957: 107, pl.5, fig.13.

Cyclophyllopsis cornutiformis Beauvais, 1986: 34 , pl. 7, fig. 1, pl. 8, fig. 1 and text-fig. 23.

Proleptophyllia cf. granulum – Lathuilière 2011: 542, pl. 3, fig. 11-12.

TYPE MATERIAL. — Lectotype: MNHN.F. M03533 . ICZN (1999) art. 74.6: designation of a lectotype for stipulation of the existence of a “ holotype ” by Alloiteau (1956a). TYPE HORIZON. — Pliensbachian . TYPE LOCALITY. — May-sur-Orne (Calvados, France). STUDIED SAMPLES. — 22 specimens: lectotype: MNHN.F. M03533 ; CPUN MAM16 , CPUN CDAm5, CPUN AM16177-2, CPUN AM16182-7, CPUN AM16188-24 and population CPUN MA1004E1-G. GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of May-sur-Orne (Calvados, France), upper Toarcian of Aïn Leuh ( Middle Atlas of Morocco).

DESCRIPTION

Turbinate, patellate or subcylindrical solitary coral with calice elliptical to subcircular in outline. Flattened calicular platform, more or less infundibuliform, with a generally deep fossa at the axis. Rejuvenescences are common in the coralla. Radial elements are straight, free or joined, subcompact costosepta with flat granule-like pennulae on lateral faces. Pennulae do not alternate between neighbouring septa and are not arranged in continuous meniana. The distal edge is ornamented of strong teeth. More the teeth are in the axial region bigger and more detached they are. They produce in the center the appearance of a papillose columella in a pit. Numerous thick dissepiments. Synapticulae present. Wall parathecal. A thin epitheca, sometimes totally eroded wraps the coralla. Probable hexameral symmetry.

Calicular diameter: 13 to 29.5 mm – Number of septa: 119 to 182 – Septal density: 4 to 6 for 2 mm.

SIMILARITIES AND DIFFERENCES

Differs from P.multiradiata Beauvais, 1986 ,which shows a convex calicinal surface with exert septa and a more discoid morphology.

Figures

FIG. 23. — Proleptophyllia granulum (Fromentel & Ferry, 1866): A, lectotype MNHN.F.M03533; B, distal view of the lectotype MNHN.F.M03533; C, rejuvenescent specimen from the batch CPUN MA1004E1-G; D, detail of costoseptal structure in the lectotype MNHN.F.M03533; E, transverse thin section of the specimen CPUN CDAm5; F, subcylindrical specimen that lost his epitheca from the batch CPUN MA1004E1-G; G, specimen pictured in the field (Dades Valley,Morocco); H, detail of the pennular septal ornamentation in the specimen CPUN G’3; I, transverse thin section of the specimen CPUN AM16182-7. Scale bars: A, B, C, 1 cm; D, E, 4 mm; F, 2 mm; G, I, 5 mm; H, 1 mm.