Vol. 59, 2020
(update: 2020.05.22; 07.10)
Lacydoniidae (Annelida) Off the
Coast of North-eastern Japan: A Description of Lacydonia japonica sp. nov.
Hookabe1,*, Naoto Jimi2, Shinji Tsuchida3,
Yoshihiro Fujiwara3, and Hiroshi Kajihara4
Marine Biological Station, Graduate School of Science, The University
of Tokyo, Miura 238-0225, Japan. *Correspondence: E-mail:
2Bioscience Group, National Institute of Polar
Research, Tachikawa 190-8518, Japan. E-mail: email@example.com
3Marine Biodiversity and Environmental Assessment
Research Center, Japan Agency for Marine-Earth Science and Technology,
Yokosuka 237-0061, Japan. E-mail: firstname.lastname@example.org (Tsuchida);
4Graduate School/Faculty of Science, Hokkaido
University, Sapporo 060-0810, Japan. E-mail: email@example.com
(Received 13 November 2019 / Accepted
14 May 2020)
Communicated by Benny K.K. Chan
Lacydonia japonica sp. nov.
(Annelida, Lacydoniidae) is described based on material found in
sediments collected off the Pacific coast of northern Honshu, Japan, at
depths of 262 m and 407 m. The sediments were obtained by a remotely
operated vehicle equipped with a suction sampler during a Tohoku
Ecosystem-Associated Marine Sciences (TEAMS) project in 2019. Lacydonia japonica sp. nov. belongs
to the eyeless group of lacydoniids and is discriminated from the
morphologically most similar congener, Lacydonia papillata Uschakov, 1958
by its reddish pigments on both the dorsal and ventral parapodial cirri
and four pigment spots on the pygidium. To assess the phylogenetic
position of the new species among other lacydoniids for which sequence
data are available in public databases, analyses were performed using
the mitochondrial cytochrome c
oxidase subunit I (COI) and
16S rRNA, as well as the nuclear 18S rRNA and 28S rRNA genes. We
additionally obtained some lacydoniids by sledging off western Japan,
but these were severely fragmented and broken during collection. Using
the paucity of morphological data, they were left unidentified as
Lacydonia sp. but included in the molecular analyses. Genetic distances
between Lacydonia eliasoni
Hartmann-Schröder, 1996, Lacydonia
japonica, and Lacydonia
sp. off western Japan were 10.4–17.1% uncorrected p-distance (11.3–18.6% K2P) in
terms of 658-bp COI sequences.
Key words: Benthos, Deep sea,
Marine invertebrates, Polychaetes, ROV.
Hookabe N, Jimi N, Tsuchida S, Fujiwara Y, Kajihara H. 2020.
Lacydoniidae (Annelida) off the coast of north-eastern Japan: a
description of Lacydonia japonica
sp. nov. Zool Stud 59:28.