Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician) Aubrechtová, Martina Korn, Dieter European Journal of Taxonomy 2022 2022-03-08 799 1 1 108 Starobogatov, 1983 Starobogatov 1983 [659,1005,419,445] Animalia Lituitida 11 12 order    Diagnosis Cephalopods with longiconic orthoconic or weakly cyrtoconic conchs, with cyrtoconic or coiled apical part. Siphuncle tubular, narrow (up to 0.20 of whorl height). Septal necks straight (orthochoanitic), rarely cyrtochoanitic in apical conch parts, and long (usually 0.25–0.30 of chamber length but over 0.50 insome taxa). Connecting rings often disaggregated and covered with cameral deposits that extend to cover the septal neck and inner parts of the connecting ring. Cameral deposits often consist of longitudinal lamellae or sheets that longitudinally divide chambers. Initial chamber small (length = 0.4 mm), subspherical, without cicatrix (after Kröger et al.2007, emended).