Pseudodiplocoenia cf. soltanensis Beauvais, 1966

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1238

Pseudodiplocoenia cf. soltanensis Beauvais, 1966

( Fig. 33 )

cf. Pseudodiplocoenia soltanensis Beauvais, 1966: 19 or 131, pl. 1, fig.7.

Pseudodiplocoenia sp. 1 – Vasseur 2018: 317-318, fig. 3.85.

TYPE MATERIAL. — Holotype MNHN.F.R10776. TYPE HORIZON. — Probably Callovian . TYPE LOCALITY. — Tunisia, between Tazerdunet and Ksar Kredima. Studied samples. — Five specimens: CPUN MA0504E7-8, CPUN MA0704E3-3, CPUN MA0704E4-2, CPUN MA0704E3-11, CPUNMA0904 E9-2. GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of Koudiat Ech Chehem ( Guigou plateau, Morocco), Callovian ? of Tunisia.

DESCRIPTION

Cerioid colony with polygonal calices multiplying by extracalicular budding. Radial elements are subcompact, free or joined, slightly wavy septa. The S1 septa are generally linked to a porous parietal columella and they sometimes look cuneiform. The wall is probably septothecal,tectiform in distal parts and producing in section a characteristic zigzag line between the calices.Endotheca made of sparse vesicular dissepiments. No synapticulae.

Calicular diameter: 2.5 to 6.1 mm – Distance between calices centers: 3 to 7 mm – Number of septa: approximately 26 – Septal density: 5 to 6 per 2 mm.

SIMILARITIES AND DIFFERENCES

Differs from Kompsasteria Roniewicz, 1989 , Rhaetiastrea Roniewicz, 1974, Septastraeopsis Alloiteau, 1953 and Sakalavastraea Alloiteau, 1958 by its extracalicinal mode of budding (and also by its parietal porous columella in comparison to the first two genera cited above).

REMARKS

The present material is referred to P. soltanensis with a cf due to the highest values of diameter that are not mentioned in the initial description of the species. We observed also a tendency to produce a small depression in the center of the axial structure in some calices ( Fig. 51E ). This character cannot be observed in the holotype due to its poor preservation.

Figures

FIG. 33. — Pseudodiplocoenia cf. soltanensis Beauvais, 1966: A, distal view of the specimen CPUN MA0904E9-2; B, transverse thin section of the specimen CPUN MA0704E4-2; C, distal view of the specimen CPUN MA0704E3-3; D, polished transverse section in the specimen CPUN MA0704E3-3; E, transverse thin section of the specimen CPUN MA0704E3-3; F, transverse polished section in the specimen CPUN MA0904E9-2 with a bright line separating the walls of the different calices. Scale bars: A, 3 cm; B, C, 5 mm; D, 6 mm; E, 3 mm; F, 4 mm.

FIG. 51. — Podosmilia horologium n. gen.,n. sp.: A, lateral view of the specimen MNHN.F.R11597; B, distal view in natural section of the specimen CPUN AM16177- 3; C, transverse thin section of the specimen CPUN 2210E2; D, distal view of the specimen CPUN 2703A7; E, distal view of the specimen MNHN.F.R11597; F, detail in transverse thin section of the characteristic pattern produced by the septal bulges in depth (specimen CPUN AM16177-3); G, deep transverse section in sample CPUN PFPyr6-2; H, deep transverse thin section in sample CPUN AM16177-3. Scale bars: A, B, C, E, H, 5 mm; D, G, 1 cm; F, 2 mm.