Biogeographia – The Journal of Integrative Biogeography

Here, I describe a new rotifer species within the Ptygura elsteri group collected from Mallorca, Spain (Palearctic). Previously reported from the Nearctic, this form possesses anatomical and ecological characteristics that indicate it to be a separate species. While other morphotypes assigned to the P. elsteri group have cervical hooks, the hooks on this morphotype are clearly different. In this report, I discuss previously published observations of this form, describe its anatomical and ecological details, and discuss its taxonomic position within the genus Ptygura. The name for this new species is Ptygura innominata n. sp.