{{Automatic taxobox | fossil_range = Middle and Late Ordovician | image = | image_caption = | taxon = Bathmoceras | authority = Barrande, 1867 }}
'''''Bathmoceras''''' is a primitive cephalopod genus from the Middle and Upper Ordovician. It is a member of the order Cyrtocerinida and is the only genus in the family '''Bathmoceratidae'''.
==Derivation== At one time<ref>{{cite book|title=Studies of the Actinoceratida.; Memoir 2;|publisher=New Mexico Bureau of Mines and Mineral Resources, Socorro, NM|last=Flower|first=R.H.|year=1957}}</ref> ''Bathmoceras'' was thought to have possibly given rise to ''Polydesmia'', once thought to have been the ancestral actinocerid. Since then revision of actinocerid phylogeny and of Ordovician stratigraphy in east Asia have cast doubts on this hypothesis.<ref>{{cite book|title=New American Wutinoceratidae with Review of Actinoceroid Occurrences in Eastern Hemisphere; Part I - Memoir 28|publisher=New Mexico Bureau of Mines and Mineral Resources, Socorro, NM|last=Flower|first=R.H.|year=1976}}</ref>
''Bathmoceras'' is most likely derived from ''Eothinoceras'' through lengthening of the septal necks and of the inward projections of the connecting rings in a forward direction.<ref name="flo">{{cite book|title=The Nautiloid Order Ellesmeroceratida (Cephalopoda)Memoir 12|publisher=New Mexico Bureau of Mines and Mineral Resources, Socorro, NM|last=Flower|first=R.H.|year=1964}}</ref> ''Eothinoceras'' differs in that the septal necks are vestigial<ref name="flo" /> rather than being somewhat long as in ''Bathmoceras'' and that the inward projections of the connecting rings point straight in rather than projecting forward. Both are straight shelled or slightly exogastric. Eothinoceras is also apparently more slender.<ref name="flo" />
Furnish and Glenister also included ''Eothinceras'' in the family Bathmoceratidae.<ref>{{cite book|title=Ellesmerocerida in the Treatise on Invertebrate Paleontology|publisher=New Mexico Bureau of Mines and Mineral Resources, Socorro, NM|last1=Furnish|first1=W.M|last2=Glenister|first2=Brian F.|year=1964}}</ref> R.H. Flower, 1964, separates the two genera into their respective families within the ellesmerocerid suborder Cyrtocerinina,<ref name="flo" /> now known as the order Cyrtocerinida.
==Preservation and occurrence== ''Bathmoceras'' is of Middle and Late Ordovician age and has been found in northern and central Europe and in the Macdonnell Ranges in central Australia.
The genus is found in Europe and Australia, mostly as internal molds in sandy sediments.<ref name="flo" /> One species ''B. linnarsoni'' was found in limestone in Sweden which allowed Holms to conduct thin section studies.
==Paleoecology and lifestyle== The common occurrence in sandy sediments indicates that ''Bathmoceras'' lived over sandy bottom, although some species obviously did spend time over carbonate shelves.
The straight or slightly upwardly curved, exogastric shells with weighted ventral siphuncles indicate a normal horizontal orientation with the aperture facing forward. They were apparently active predators with some degree of mobility. As for the peculiar internal structure of the siphuncle, beyond providing ballast, no reason has been given.
==Description== The shells of ''Bathmoceras'' are rather large, straight or faintly exogastric. Sutures are simple except for a sharp mid ventral saddle. The siphuncle is large and near the venter, in which the segments have a slightly sinuous outline. Septal necks are rather long. Most diagnostically, the connecting rings are thickened into forward projecting lobes that may extend internally two or three segments within the siphuncle.{{citation needed|date=June 2016}}
==References== {{Reflist}}
{{Taxonbar|from=Q4869043}}
Category:Ellesmerocerida Category:Ordovician cephalopods Category:Ordovician cephalopods of Europe Category:Middle Ordovician first appearances Category:Late Ordovician extinctions