Contributions to the Lower Carboniferous Cyrtosymbolinae (Trilobita)
Halszka Osmólska
Acta Palaeontologica Polonica 13 (1), 1968: 119-150
Seven species and subspecies of the Lover Carboniferous Cyrtosymbolinae Hupe from Poland and Great Britain are described, including 5 new ones. They are assigned to 5 subgenera (one new) of the genus Archegonus Burmeister, 1843 (emend. Hahn, W65). Archegonus (Cyrtoproetus) Reed, 1943 is revised. The relation between Archegonus (Phillibole) R. & E. Richter, 1937 and Liobole R. & E. Richter, 1949 is discussed. Also described is the ontogenetic development of Archegonus (Phillibole) aprathensis richteri n.subsp.
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