Opis

Przyżyciowo nietrwałe rurki syfonu.

Diagnosis. - Subcentral, cylindrical siphuncle with long septal necks. Exogastric coiling of the apical part of shell, extended in phylogeny over later ontogenetic stages; funnel sinus narrow and deep, except in the most primitive forms.
Remarks. - The Lituitina differ from homeomorphic representatives of the Tarphyceratida and Nautilida in their narrow apertural sinus constricted by lateral lappets, and the funnel sinus. The boundary between the Lituitina and Orthoceratina is traced rather arbitrarily, as the genus Rhynchorthoceras and whole family Sinoceratidae may be assigned to the suborder Orthoceratina as well as to the Lituitina.

Synonimy

Zasięg czasowy

Literatura

Dzik, J. 1984a. Phylogeny of the Nautiloidea. Palaeontologia Polonica 45, 1-255