Phylloseris

Tomes, 1882, p. 446

Type Species

Phylloseris rugosa Tomes 1882, p. 447, pl. 18 fig. 8_10; Monotypy

Type Specimen: Lectotype; NHMUK R 11011; Verified; Dry Preserved

Type Locality: Aalenian of Lowest Coral Bed of Crickley (Great Britain)

From the syntypes of Crickley and Horse Pools, Beauvais (1970) selected a lectotype (abusively named holotype in the legend of pl.3 fig.2 and evoked with some confusion in p. 1126) and figured and described it p.1124, pl. 3 fig. 2. The paralectotype 11016 provides good complements.

Description

Massive lamellar cerio-thamnasteroid corallum. i.e.radial elements confluent but with a wall and a change in direction on both sides of the wall. Corallites subpolygonal. Epitheca locally present even on the calicular surface, especially in case of rapid vertical growth. Subequal costae in small fans corresponding to new corallites that appear preferentially at the outer edge (intra or extracalicinal ?). Radial elements are compact biseptal sheets anastomosing in the center, rather constant in thickness, straight rather than curved within their septal part. Distal and inner edge finely dentate with regular and equal teeth, lateral faces with small acute granules, possibly carinae. no pali. Microstructure unknown but small trabecules are quite distinct from microarchitecture. Hexameral symmetry possibly present, bilateral symmetry not observed even at the periphery of the colony. Endotheca with abundant vesiculose dissepiments, The axial zone seems rather variable, columella mostly absent, sometimes a weak parietal or more rarely a lamellar structure. Synapticulae possibly present near the wall. Wall moderately elevated to not apparent from above, of unknown nature.

Remarks

Three nominal species known in Jurassic

Distribution

• Western Europe; Middle Jurassic

This page has been in preparation since 19-Aug-2009 16:53

This version was contributed by Bernard Lathuilière on 14-Mar-2013 15:33.

Page authors are: Bernard Lathuilière. Please contact the editor if you would like to contribute to the diagnosis of this taxon.

The editor is: Bernard Lathuilière