Acanthohoplites aschiltaensis var. rotundatus Sinzow, 1908

Frau, Camille, 2023, The systematic affinities between the Lower Cretaceous Ammonoidea Protacanthoplites abichi (Anthula, 1900) and Acanthohoplites aschiltaensis (Anthula, 1900), European Journal of Taxonomy 888 (1), pp. 137-158 : 148

Acanthohoplites aschiltaensis var. rotundatus Sinzow, 1908

The subspecies is based on a single, incomplete, moderate-sized phragmocone of an acanthohoplitid from the Mangyshlak Peninsula ( Sinzow 1908: pl. 5 figs 2–3). The specimen closely resembles the paralectotype PMU.24108 of Acanthohoplites aschiltaensis (compare with Fig. 6D–H ). The rounded whorl section of Acanthohoplites aschiltaensis var. rotundatus cannot be retained as a distinctive conch parameter since its whorl width index (Ww/Wh ~ 1) falls in the variability of the type material. Consequently, it seems unnecessary to separate the subspecies rotundatus from Acanthohoplites aschiltaensis . Other citations of the subspecies rotundatus in the literature differ from true Acanthohoplites aschiltaensis (see synonymy list in Appendix).

Figures

Fig. 6. Acanthohoplites aschiltaensis (Anthula, 1900). A–C. Paralectotype (PMU.24107). D–H. Paralectotype (PMU.24108). Scale bars = 10 mm.