Xenognath type of polychaete jaw apparatuses
Piotr Mierzejewski and Grażyna Mierzejewska
Acta Palaeontologica Polonica 20 (3), 1975: 437-444
A new type of ?eunicid jaw apparatuses designated xenognath is described; it differs from previously known jaw. apparatuses in having the denticulated ridges.in compound jaws perpendicular to apparatus axis. It includes the Ordovician genus Archaeoprion nov., assigned to a new family Archaeoprionidae.
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