Palaeodawsonocerina Kröger & Isakar, 2006

Kröger, Björn, 2013, The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden, European Journal of Taxonomy 41, pp. 1-110 : 34

Genus Palaeodawsonocerina Kröger & Isakar, 2006

Type species

Spyroceras senckenbergi Teichert, 1930 , from Lyckholm, Estonia; “Lyckholm stage” of Teichert (1930), Vormsi/Pirgu Regional Stage, late Katian, Late Ordovician.

Diagnosis

Straight or slightly cyrtoconic, circular or subcircular shell, with prominent, narrowly spaced annulations, growth lines and numerous subordinate filiform longitudinally raised lines, producing a finely reticulate pattern. Siphuncle central or slightly eccentric, slightly expanded, with achoanitic to very short orthochoanitic septal necks. Apex blunt, slightly cyrtoconic, annulated. (From Kröger & Isakar 2006.)