Ellesmeroceratidae Kobayashi, 1934

Dzik, Jerzy, 2020, Variability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia, Acta Palaeontologica Polonica 65 (1), pp. 149-165 : 162

Family Ellesmeroceratidae Kobayashi, 1934

Remarks.— Korde (1949) introduced the family name Ruthenoceratidae without any comments. Chen and Teichert 1983) proposed to separate longiconic ellesmeroceratids with supposedly thin connecting rings and diaphragms restricted to apical part of the phragmocone into the family Acaroceratidae . I find both these taxa redundant at the present stage of knowledge.