Trochophyllia Alloiteau, 1952

Trochophyllia Alloiteau, 1952 View in CoL

Type species Montlivaltia melania Fromentel, 1861 View in CoL

Description. Solitary turbinate coral. Corallite outline circular, corallite pit depressed. Septa compact. Microstructure of septa unknown. Septa in cross section externally slightly thicker, becoming slightly thinner towards the centre. Symmetry of septa radial and regularly hexameral or decameral. Cycles of septa regular. Septal cycles differ in length and thickness. First septal cycles extend to the corallite centre, later cycles are shorter and thinner. Septa not connected to each other. Septal distal margin smooth, lateral face with granules, inner margin smooth. Pali absent. Costae present, smooth on their surface. Synapticulae absent. Columella absent. Endotheca consists of dissepiments. Wall absent. Epitheca present.

Remarks. Te genus has not received much attention after its creation. Te description of the characteristics is based on the lectotype of Montlivaltia melania . Tin sections are not available from the type specimen, therefore the septal microstructure can only be inferred from the ornamentation of the upper septal margin.

Trochophyllia cf. melania ( Fromentel, 1861)

Fig. 6 3–4 View Fig View Fig View Fig

Material FPJ 384; 1 thin section.

Dimensions (FPJ 384)

cmin33.8

septa120

Description Solitary turbinate coral. Corallite outline elliptical. Septa compact. Microstructure of septa unknown. Septa in cross section externally slightly thicker, becoming slightly thinner towards the centre. Symmetry of septa radial and regularly hexameral. Cycles of septa regular. Septal cycles differ in length and thickness. Tree septal cycles extend to the corallite centre, later cycles are shorter and thinner. Septa not connected to each other. Septal distal margin unknown, lateral face smooth (probably because of the poor state of conservation). Te inner margin is slightly swollen. Pali absent. Costae present. Synapticulae absent. Columella absent. Endotheca consists of very few dissepiments. Wall absent. A very thin epitheca is present.

Remarks Te present specimen is only a fragment. It can only be compared to T. melania because the lectotype of T. melania (MNHN M03534) has only 98 septa. Tis species was originally described from the Upper Oxfordian of Champlitten ( France, Haute-Saône). Te present specimen also compares to T. tourtiensis ( Bölsche, 1871) but that species has much smaller corallite dimensions.