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Published on: July 11, 2025
Molecular systematics of Tanaidacea (Crustacea: Peracarida) based on 18S sequence data, with an amendment of
Keiichi Kakui1, Toru Katoh, Shimpei F Hiruta
1Department of Natural History Sciences, Hokkaido University, Sapporo, Japan. k_kakui@mail.goo.ne.jp
Abstract:
Phylogenetic relationships within Tanaidacea were analyzed based on sequence data for the 18S rRNA gene. Our results strongly supported a monophyletic group composed of Neotanaidae, Tanaoidea, and Paratanaoidea, with the first two taxa forming a clade. These results contradict three previously suggested hypotheses of relationships. Based on the molecular results, and considering morphological similarities/differences between Neotanaidomorpha and Tanaidomorpha, we demoted Suborder Neotanaidomorpha to Superfamily Neotanaoidea within Tanaidomorpha; with this change, the classification of extant tanaidaceans becomes a two-suborder, four-superfamily system. This revision required revision of the diagnoses for Tanaidomorpha and its three super-families. The results for Apseudomorpha were ambiguous: this taxon was monophyletic in the maximum likelihood and Bayesian analyses, but paraphyletic in the maximum parsimony and minimum evolution analyses.
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