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Published: 2020-12-28

A new interstitial genus and species of Acrocirridae from Okinawa-jima Island, Japan

Bioscience group, National Institute of Polar Research, 10-3 Midoricho, Tachikawa 190-8518, Japan
Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, Aomori 039-3501, Japan
Bioscience group, National Institute of Polar Research, 10-3 Midoricho, Tachikawa 190-8518, Japan The Graduate University for Advanced Studies, SOKENDAI, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan


A new interstitial acrocirrid, Actaedrilus yanbarensis gen et. sp. nov., is described from Okinawa-jima Island, Japan. Individuals of the new genus and species were collected from the interstices of subtidal coarse sand (about 1 m depth). The new genus is comprised of the new species and A. polyonyx (Eliason, 1962) comb. nov. and it is characterized by the presence of two pairs of long branchiae, non-retractile head, minute body, and short club-shaped palps. We infer the phylogenetic position of A. yanbarensis gen. et sp. nov. within Acrocirridae using five gene markers (COI, 16S, 18S, 28S, Cyt B).


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