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Neocaridina iriomotensis is described from Iriomote Island, southern Ryukyus, Japan. This species apparently belongs to the N. palmata species group and is morphologically closest to N. anhuiensis (Liang, Zhu & Wei, 1984) and N. ishigakiensis (Fujino & Shokita, 1975). It can be differentiated from the former by the longer rostrum and the presence of a pterygostomian spine, and from the latter by the armature of the rostrum.
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Naruse et al. (2006) studied this question.
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