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Taxonomy
Cyclus was named by de Koninck (1841) [Sepkoski's age data: C Vise-l P l Sepkoski's reference number: 2]. It is not extant. Its type is Agnostus radialis. It is the type genus of Cyclidae.
It was assigned to Xiphosura by Rogers (1902); to Cyclida by Sepkoski (2002); and to Cyclidae by Goldring (1967), Glaessner (1969), Schram et al. (1997), Schweitzer et al. (2020), Schram and Koenemann (2021).
It was assigned to Xiphosura by Rogers (1902); to Cyclida by Sepkoski (2002); and to Cyclidae by Goldring (1967), Glaessner (1969), Schram et al. (1997), Schweitzer et al. (2020), Schram and Koenemann (2021).