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A newly collected specimen of the enigmatic coleoid genus  Longibelus  is recorded from lower Turonian strata along the River Shadrinka in Sakhalin (Russian Far East). To date, this is the first record of Late Cretaceous coleoid cephalopods from the island and, in fact, from the entire Pacific coast of the Russian Federation. Lithological characteristics, coupled with published geochemical analyses (δ 13 C and C org  content), suggest the habitat of this coleoid taxon to have been the middle to outer (i.e. distal) shelf. Its provenance from the stratigraphical level that is known as the  Scaphites  Event, characterised by a mass occurrence of  Scaphites  and  Yesoites , may be indicative of occasional or marginal overlap in ranges, rather than life in similar habitats. On the basis of lithological features and in view of the extremely rare occurrence of  Longibelus  in rich ammonite assemblages with clear ecological/bathymetric preferences, the natural habitat of  Longibelus  may have comprised neritic to mesopelagic zones over distal shelves and slopes.

swiss journal of palaeontology

First record of the enigmatic coleoid genus Longibelus from Sakhalin (Far East Russia): a contribution to our understanding of Cretaceous coleoid habitats in the Pacific Realm