(from Chernyshev, A. V. (2007). Nemerteans of the Genus Ototyphlonemertes (Enopla: Ototyphlonemertidae) from Van Phong Bay (South Vietnam). Journal of Marine Biology. 33, 196-199.)
The systematics of the genus Ototyphlonemertes are known for particular complexity: only approximately 20 of the nearly 100 known “species” (or “forms”) are given full species names. In studies dealing with this genus, a considerable number of species are presented under names such as Ototyphlonemertes sp. I, II, III; O. aerneba b, or Ototyphlonemertes sp. A, or Norenburg 34, F-SB1 etc. This state of the systematics of the genus Ototyphlonemertes is caused by the fact that it is still not clear whether the distribution of cirri on the nemertean body that are used for discriminating close species and some other minor differences can be taken as valid species characters. Neither a variability analysis, nor even a DNA-analysis allowed us to reach an unambiguous conclusion on this question.
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