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Hercoglossidae
Hercoglossidae was established by Spath in 1927 for smooth, involute nautiloids characterized by a suture with differentiated elements, known from the Upper Jurassic to the Oligocene. Hercoglossids make up part of the Nautilid superfamily Nautilaceae. ( 1964)
Four genera are described in the Treatise ( 1964). They are ''Hercoglossa'', ''Aturoidea'', ''Cimonia'', and ''Deltoidonatilus''. All have a whorl section that is generally rounded, except for ''Deltoidonatilus'' where in it is triangular in outline. Sutural complexity increases from ''Cimonia'' to ''Hercoglossa'' and to ''Aturoidea''. The suture in ''Deltoidonautilus'' is like than in ''Hercoglossa''. (ibid)
''Cimonea'', which intergades with ''Eutrephoceras'', is the earliest and makes its first appearance in the Upper Jurassic. ''Eutrephoceras'' is assigned to the Nautilidae which includes ''Nautilus''. ''Hercoglassa'', which is derived from ''Cimomia'', first appears in the Lower Cretaceous and is followed stratigraphically by ''Aturoidea'' and ''Deltoidonautilus'' which first appear in the Upper Cretaceous. ''Aturoidea'' is the source for ''Aturia'', to which it gave rise in the Paleocene. (ibid)
==References==
* , B 1964. Nautilioidea - Nautilida, in the Treatise on Invertebrate Paleontology, Part K Nautiloidea, Geological Society of America and University of Kansas press. (K455-K457)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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