The Importance of Type Species and their Correct Identification – a Key Example from Tintinnid Ciliates (Alveolata, Ciliophora, Spirotricha)

Types and the corresponding rules in the International Code of Zoological Nomenclature are crucial for taxonomy and are meant to provide nomenclatural stability. In the case of neotypification, especially diligent taxonomic work is required to retain continuity. In the present communication, we first outline the main principles of typification and neotypification. We then discuss a critical case, using a current example from the marine planktonic tintinnid genus Tintinnopsis Stein, 1867 (Alveolata, Ciliophora). This diverse and ubiquitous genus is non-monophyletic, but its revision and the erection of new related genera is currently prevented by the uncertain affiliation of its type species.

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