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 Order Barrandeocerida Flower in Flower & Kummel, 1950 Remarks The order Barrandeocerida was not accepted by Dzik (1984: 46) , who placed the genus Barrandeoceras Hyatt, 1884 within the Tarphyceratidae , or by Flower (1984: 1377) , who placed the family Barrandeoceratidae within the Tarphycerida . However, Barrandeoceras and similar forms, which were assigned to the Barrandeocerida by Flower & Kummel (1950) and Sweet (1964a) are clearly distinguished from Tarphycerida in having a thin-walled orthocerid-like siphuncle with achoanitic to cyrtochoanitic septal necks. The differences between the connecting ring structure and morphology in tarphycerids and barrandeocerids were examined and discussed by Mutvei & Dunca (2011) , renewing earlier hypotheses (see Flower 1984 ) of an orthocerid ancestry for the Barrandeocerida (see discussion below).