Leptocyathus
Milne Edwards and Haime, 1851, p. 21
Type Species
Leptocyathus elegans Milne Edwards and Haime, 1851, p. 21, pl. 3, fig. 6.; Original Designation Milne Edwards and Haime, 1851, p. 21
Type Specimen: Holotype; ; Not Traced; Unknown
Type Locality: Lower Eocene of England (Haverstock Hill, London Clay).
Classification
Synonyms
Diagnosis
Solitary, discoidal, free. Costosepta compact, exsert, finely granulated laterally. Pali opposite all cycles of septa, merging with papillose columella. Wall septothecal.
Remarks
In the past, a few Cretaceous forms were originally assigned to Leptocyathus. The forms known to the author are Leptocyathus gracilis Duncan, 1870, from the Lower Cretaceous to the Lowermost Upper Cretaceous of England, and Leptocyathus hexacristatus Alloiteau, 1936, from the Maastrichtian of Madagascar. Because, based on e.g. the appaerance of both very elongate paliform structures before all septal cycles and very smooth septal margins, Duncan's material seems to rather correspond to the genus Deltocyathus. In addition, recent studies carried out on the type material of Leptocyathus hexacristatus Alloiteau by Baron-Szabo (2008, p. 160) revealed that it corresponded to the taxon Paracycloseris nariensis (Duncan, 1880). Therefore, the occurrence of the genus Leptocyathus is most likely restricted to the Cenozoic.
Distribution
- Southern Europe; Eocene
- Central Europe; Eocene
- South Asia; Eocene
- Central Europe; Miocene
- Western Atlantic; Recent
Lower Eocene of England (London clay) and Pakistan (Khirthar series), Eocene of France (Biarritz) and Italy (Vicentin); Miocene: Miocene of France, Tortonian of Austria, Recent: Caribbean.This page has been in preparation since 08-Oct-2008 15:21
This version was contributed by Rosemarie Baron-Szabo on 28-Aug-2010 19:19.
Page authors are: Rosemarie Baron-Szabo. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Stephen D. Cairns
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