Lithoseris
Koby, 1886, p. 338
Lithoseris Koby, 1886, p. 338 is a junior synonym (available and invalid), see Epistreptophyllum Milaschewitsch, 1876, p. 210.
For a long time, Lithoseris is considered as a junior synonym of Epistreptophyllum. This position is confirmed here after a revision of the type-material. It is also consistent for L. compressa, the other nominal species of Lithoseris
Type Species
Lithoseris gracilis_ Koby, 1886, p. 338, pl. 93 fig. 32; Subsequent Designation Vaughan (1905), p. 398
Type Specimen: Syntype; NMB D4763; Verified; Dry Preserved
Type Locality: Oxfordian (Upper Jurassic) from St Ursanne (Switzerland)
Classification
Description
From the syntype. Solitary subcylindrical corallum. Calice infundibuliform. Epitheca not observed. Thin subequal costae. Corallite subcircular, slightly irregular in outline. Radial elements subcompact (?) anastomosed in a voluminous spongy or papillose (?) columella. Costo-septa rather constant in thickness from the outer to the inner edge, mostly straight. Distal edge dentate, not well preserved, lateral faces not observed, palis absent. Microstructure unknown. Clear radial symmetry, a hexameral arrangement cannot be deciphered, bilateral symmetry not seen. Endotheca not clearly observed. Concerning the synapticulae, the state of preservation does not allow a significant diagnostic. Wall very close to the periphery, possibly parathecal (?).
Remarks
A part of the high relief of the columella of the syntype could result in part from an excessive preparation. A soft additional preparation by sandblasting was realised in nov. 2011 by A. Heintz in order to see a little better the costae. The carving tracks around the columella are attenuated. Two Jurassic nominal species.
This page has been in preparation since 19-Aug-2009 15:15
This version was contributed by Bernard Lathuilière on 03-Oct-2013 13:56.
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
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