The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden Author Kröger, Björn text European Journal of Taxonomy 2013 2013-03-27 41 1 110 journal article http://dx.doi.org/10.5852/ejt.2013.41 386010a0-6da4-4fa3-9d1a-4b3b5427cac5 2118-9773 3814221 A2F1B9ED-870A-466E-B35E-BD5DA782476E 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 .)