Abstract
AbstractLacydonia Marion & Bobretsky, 1875 is the sole genus in the family Lacydoniidae Bergström, 1914. We herein describe the new species of Lacydonia shohoensis sp. nov. from 2042-m deep bottoms at Shoho Seamount of the Nishi-Shichito Ridge, the Northwest Pacific Ocean. It is most similar to L. anapaulae Rizzo et al., 2016 in having a depression on the median anterior region and lacking lateral lobes on the posterior margin of prostomium whereas it is distinguished by possessing pygidium dorsally pigmented with three reddish spots and non-pigmented pygidial lateral cirri equally elongated.
Highlights
We describe a new species of Lacydonia Marion & Bobretsky, 1875 associated with a piece of sunken wood collected at Shoho Seamount of the Nishi-Shichito Ridge in the North-western Pacific during the research project ‘Development of Biodiversity Monitoring Methods for the Management of Deep-sea Marine Protected Areas’
Type material Three specimens: holotype, NSMT-Pol H-844, preserved in 70% ethanol, 33 chaetigers, 4.0 mm in the body length and 1.1 mm in maximum body width, collected from wood falls found at a depth of 2042 m, 32°20.854′N 138°39.472′E, Shoho Seamount, Nishi-Shichito Ridge, Japan, by the remotely operated vehicle (ROV) ‘KM-ROV’ dive #122 during the KM 20-10C cruise of the RV ‘Kaimei’ on 26 November 2020; posterior tip used for DNA extraction
Lacydonia shohoensis sp. nov. is morphologically similar to L. anapaulae Rizzo et al, 2016, L. gordia Hartmann-Schröder, 1993, L. laureci Laubier, 1975, L. laureci sensu Böggemann (2009) and L. laureci sensu Rizzo et al (2016) in the absence of eyes and prostomial width being more than twice its length (Table 3)
Summary
Wood falls serve as a significant organic source to the oligotrophic deep-sea environment (Bienhold et al, 2013; McClain & Barry, 2014). Several members of polychaetes such as polynoids are known as a main indicator species of successional stage during colonization and development of wood-fall benthic communities (McClain & Barry, 2014). The members have been known to occur among encrusting algae on coral rubbles as well as in sandy and muddy substrata mixed with shell debris, gravel and volcanic rocks (Rouse & Pleijel, 2001; Rizzo et al, 2016; Mazurkiewicz et al, 2017). We describe a new species of Lacydonia Marion & Bobretsky, 1875 associated with a piece of sunken wood collected at Shoho Seamount of the Nishi-Shichito Ridge in the North-western Pacific during the research project ‘Development of Biodiversity Monitoring Methods for the Management of Deep-sea Marine Protected Areas’. We performed morphological examination by use of a scanning electronic microscope (SEM) for the 15th member of the genus, as well as preliminary analyses for phylogenetic relationships within Lacydonia based on partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI), 16S rRNA (16S) genes, and the nuclear 18S rRNA (18S) and 28S rRNA (28S) genes
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