Baseodiscus profundus, 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 : 525

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.7036929
persistent identifier	https://treatment.plazi.org/id/C892A88C-DEBF-44A5-AD1C-0DE7D9823B69
taxon LSID	lsid:zoobank.org:act:C892A88C-DEBF-44A5-AD1C-0DE7D9823B69
treatment provided by	Plazi
scientific name	Baseodiscus profundus
status	sp. nov.

Treatment

BASEODISCUS PROFUNDUS SP. NOV.

( FIG. 2G View Figure 2 )

Baseodiscinae sp. 21DS: Chernyhsev & Polyakova, 2018: 125, 128, 130, table 1, fig. 1F, fig. 4B.

Baseodiscinae sp. 7DS: Cheryshev & Polyakova, 2018: 125, table 1.

Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. o r g: a c t: C 8 9 2 A 8 8 C - D E B F - 4 4 A 5 - A D 1 C - 0DE7D9823B69.

Material examined: Two specimens, collected by A. V. Chernyshev. Holotype, MIMB 42257 View Materials , 22 July 2015, S/ V Akademik M.A. Lavrentyev, station 7-1, Sea of Okhotsk (46°57.0′N, 151°05.0′E), 3300 m depth, mud. GoogleMaps Paratype, MIMB 42258 View Materials , 23 July 2015, S/ V Akademik M. A. Lavrentyev, station 7-11, Sea of Okhotsk (46°57.0′N, 151°00.4′E), 3306 m depth, mud GoogleMaps .

Sequences: Determined by Chernyshev & Polyakova (2018). From the holotype (as Baseodiscinae sp. 21DS): MF512047 View Materials , 16S (499 bp) ; MF512072 View Materials , 18S (1760 bp) ; MF512098 View Materials , 28S (359bp) ; MF512140 View Materials , H3 (331bp). From the paratype (as Baseodiscinae sp. 7DS) : MF512045 View Materials , 16S (499 bp) ; MF512070 View Materials , 18S (1770 bp) ; MF512096 View Materials , 28S (1050 bp) ; MF512138 View Materials , H3 (331 bp) .

Etymology: The new specific name is the Latin adjective profundus meaning ‘deep’.

Description: Body 25–27 mm long, 1.0–1.2 mm wide, cylindrical in foregut region and slightly flattened in region of intestine; head dark rose, body pale rose, yellowish gonads visible through integument ( Fig. 2G View Figure 2 ); thin transverse furrows present; secondary furrows not confirmed; eyes absent; mouth small, pit-like. Diagonal muscle layer absent in proboscis ( Chernyshev & Polyakova, 2018).

Distribution: Known only from the Sea of Okhotsk ( Chernyshev & Polyakova, 2018).

Remarks: This new species differs from other species in the genus in having a relatively small, narrow body lacking any specific colour patterning. Baseodiscus profundus may be unique within the genus in lacking the proboscis inner diagonal musculature, which has been confirmed in all the other congeners studied so far ( Magarlamov & Chernyshev, 2011; Chernyshev, 2015).