Baseodiscus komatsui, Kajihara & Abukawa & Chernyshev, 2022

Kajihara, Hiroshi, Abukawa, Shushi & Chernyshev, Alexei V., 2022, Exploring the basal topology of the heteronemertean tree of life: establishment of a new family, along with turbotaxonomy of Valenciniidae (Nemertea: Pilidiophora: Heteronemertea), Zoological Journal of the Linnean Society 196, pp. 503-548 : 526-527

publication ID

https://doi.org/ 10.1093/zoolinnean/zlac015

publication LSID

lsid:zoobank.org:pub:78C56409-FCCF-4116-8D8C-FF66B247C56C

DOI

https://doi.org/10.5281/zenodo.7036937

persistent identifier

https://treatment.plazi.org/id/28FE54EB-D2A3-4D1F-9A60-302696A12338

taxon LSID

lsid:zoobank.org:act:28FE54EB-D2A3-4D1F-9A60-302696A12338

treatment provided by

Plazi

scientific name

Baseodiscus komatsui
status

sp. nov.

BASEODISCUS KOMATSUI SP. NOV.

( FIGS 2K View Figure 2 , 6F View Figure 6 )

Zoobank registration: u r n: l s i d: z o o b a n k. org:act: 28FE54EB-D2A3-4D1F-9A60-302696A12338.

Material examined: Two specimens; detailed depth information lacking for both, but probably<20 m depth. Holotype, NMNS-Ne 1 (DNA voucher ICHUM 6342 View Materials ), 27 June 2014, subtidal, SCUBA diving, Nishijima-Oiwa (27°07′06″N, 142°10′19″E), Ogasawara Islands , Japan, collected by H. Komatsu. GoogleMaps Paratype, ICHUM 6312 View Materials , 27 May 2001, subtidal, SCUBA diving, among coral rubble, Kakeroma-jima (c. 28°7′29″N, 129°14′41″E), Kagoshima, Japan, collected by H. Kajihara. GoogleMaps

Sequences: From the holotype: LC178597 View Materials , 18S (1775 bp) ; LC178627 View Materials , 28S (2107 bp) ; LC178648 View Materials , H3 (331 bp) ; LC178673 View Materials , 16S (504 bp). From the paratype: LC178596 View Materials , 18S (1798 bp) ; LC178626 View Materials , 28S (2123 bp) ; LC178672 View Materials , 16S (479 bp) .

Etymology: The new specific name is a noun in the genitive case, after Dr Hironori Komatsu (National Museum of Nature and Science, Japan), a Japanese carcinologist, who collected the holotype specimen.

Description: Background body colour beige, uniformly mottled with brown to dark-olive dots and lines on dorsal, ventral and lateral surfaces of body ( Figs 2K View Figure 2 , 6F View Figure 6 ). Eyes and cephalic furrows (with secondary furrows) present, as in congeners. In life, holotype 120 cm long, 8 mm wide; paratype, 16 cm long, 2.5 mm wide.

Distribution: So far known from the Ogasawara Islands (type locality) and the island of Kakeromajima in Japanese waters, but probably more widely distributed in warm waters in the western Pacific.

Remarks: The mottling pattern in Baseodiscus komatsui resembles that in B. takakurai , but the two species differ in body colour: the mottling is much paler in the former than in the latter, where it is dark brown or black; the background colour is light beige in B. komatsui , yellowish in B. takakurai . The mottling tends to be blurred in the posterior part of the body in B. komatsui . These two species differ at six of the 220 amino-acid positions translated from the 658-bp COI sequences: positions 118 and 122, alanine in B. komatsui , serine in B. takakurai ; 126, glycine in B. komatsui , alanine in B. takakurai ; 154, isoleucine in B. komatsui , valine in B. takakurai ; 159, arginine in B. komatsui , leucine in B. takakurai ; 190, glycine in B. komatsui , alanine in B. takakurai .

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