Holotype. Specimen MB.C.18683.1

2010 Bollandoceras subangulare: Bockwinkel, Korn & Ebbighausen, p. 229, text-figs. 16, 17

A rather wide umbilicus in the adult stage. It differs fromthe co-occurring B. nitens mainly in the wider umbilicus (uw/dm 0.20–0.25 at 20 mm dm in B. subangulare andonly 0.10–0.15 in B. nitens). B. subangulare has rather strong steinkernconstrictions, which is different from B. nitens. Differ from B. hagaraswad andB. hagarkarim in their much shorter evolute juvenile stage.

(after Korn et al., 2010)