Dommergues J.-L., Bonnot N. (2007) Présence en Bourgogne d'Epideroceras hugi Donovan,1958, une ammonite rare du sinémurien supérieur :ontogenèse, statut spécifique et parenté // Rev. sci. Bourgogne-Nature. Vol.6. P.76-84.
Pdf : http://geopaleo.com/telecha....not.pdf
An especially well preserved specimen of Epideroceras hugi Donovan, 1958 was recently collected in the Late Sinemurian (Raricostatum chronozone, Macdonelli subchronozone) near Drevin (Sâone-et-Loire, France). E. hugi is a large Eoderoceratoidea which was until now only known in a single fossiliferous locality of the Swiss Median Prealps (Thun area). E. hugi belongs to the group of E. lorioli (Hug, 1899) a taxon which is rather common close to the northern margin of the western Tethys but which is also known in some other areas as for example the austroalpine domain, the South-West Germany, the eastern part of the France, and the South-West England. The ontogeny of the new specimen from Burgundy is complex. Its analysis allows to confirm E. hugi as a credible valid species. Indeed, the adult ornamental pattern of E. hugi is clearly distinct of those of all the other forms related to the group of E. lorioli. Among these latter, E. steinmanni is, for example, considered as a possible morphotype within the intras-
pecific variability of E. lorioli. Conversely E. hugi is probably a distinct species with restricted ranges in space and time.