Taxon - Links and literature
Frýda J., Rohr D. M. (1999): Taxonomy and paleobiogeography of the Ordovician Clisospiridae and Onychochilidae (Mollusca), Acta Universitatis Carolinae - Geologica 43(1/2) [as Clisospira occidentalis Whitfield, 1877]
Frýda J., Rohr D. M. (1999): Taxonomy and paleobiogeography of the Ordovician Clisospiridae and Onychochilidae (Mollusca), Acta Universitatis Carolinae - Geologica 43(1/2) [as Clisospira occidentalis Whitfield, 1877]