Isastrea aff. bernardiana (d’Orbigny, 1850)

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1277-1279

Isastrea aff. bernardiana (d’Orbigny, 1850)

( Fig. 62 )

Prionastrea bernardiana d’Orbigny, 1850: 293 .

Isastrea bernardiana – Lathuilière 1988: 287, pl. 1-4 cum syn; 1989: 887, pl. 1, 2; 1996: pl. 73, fig. 11-12; 2000a: 61, fig. 6.5- 6.8. — Pandey & Fürsich 1994: 78, fig. 2; 2003: 53, pl. 12, fig. 1-2, pl. 13, fig. 1; 2006: 54.

Isastrea bernardi – Prinz 1991: 185, pl. 5, fig. 10.

Complexastrea carpathica Morycowa & Mišík, 2005: 424 , fig. 6.6-7.

? Complexastrea sp. – Morycowa & Mišík 2005: 426, fig. 6.5.

Complexastraeopsis kouteki Morycowa & Mišík, 2005: 426 , fig. 6-8.

Isastrea helianthoides Morycowa & Mišík, 2005: 426 , fig. 7.6-7.

Isastrea robusta Morycowa & Mišík, 2005: 428 , fig. 7.1-5.

Gen. indet. 3 sp. 1 – Vasseur 2018: 207-208, fig. 3.42.

Gen. indet. 4 sp. 1 – Vasseur 2018: 210-211, fig. 3.43.

TYPE MATERIAL. — Lectotype MNHN.F.R53023, subsequent designation following the abusive stipulation of the existence of a holotype by Beauvais (1966) ( ICZN 1999 : art.74.6.). TYPE HORIZON. — Bajocian (Dogger). TYPE LOCALITY. — Langres, France. STUDIED SAMPLES. — 10 specimens: CPUN AM1603A8-2, CPUN Gu 0905E9, CPUN Gu 0805E5, CPUN Gu 1105E3-1, CPUN Gu 1105E3-2, CPUN MA1004E1-5, CPUN MA1004E4-6, CPUN MA1004E4-28, CPUN MA1004E4-31, CPUN MA1004E5-7. Many more have been seen in the field. GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Upper Pliensbachian of Guigou Plateau ( Middle Atlas of Morocco), Middle / Upper Toarcian of Amellagou ( High Atlas of Morocco), Bajocian of France, Belgium, Luxembourg, Switzerland, Slovakia, Romania (unpublished), Morocco, Canada, Northern Chile, India, Iran.

DESCRIPTION

Cerioid massive corallum without holotheca, with subcircular to polygonal calices showing intracalicular budding. Compact, straight or curved, free or joining, subconfluent septa. Lateral faces of septa with sharp granules typically montlivaltid in shape and disposition. Calicular fossa is not elongated and shows sometimes in its center a variable columella often joined by some first order septa. Sometimes the axial space leaves place for trabecular projections of septa that produce a papillose columella-like structure. Endotheca made of vesicular dissepiments. A zigzag wall of variable nature is present. No synapticulae observed or perhaps in the wall.

Calicular diameter: 1.6 to 9 mm – Distance between calices: 2 to 7 mm – Number of septa: 20 to 49 – Septal density: 4 to 8 per 2 mm.

REMARKS

These Pliensbachian specimens show an important variability of the axial structure.

Figures

FIG. 62. — Isastrea aff.bernardiana (d’Orbigny,1850):A, distal view of the specimen AM1603A8-2;B, detail in distal view of the specimen Gu1105E3-2;C, detail in distal view of the specimen MA1004E1-5;D, detail in transverse thinsection of calices in thespecimen AM1603A8-2;E, distalview of the specimen Gu0905E9;F, longitudinalthin section in the specimen Gu1105E3-1; G, detail in transverse thin section of calices in the specimen MA1004E5-7.Scale bars:A, 4 cm; B, 1 cm; C, 5 mm; D, F, G, 4 mm; E, 2 cm.