Baseodiscus princeps (Coe, 1901)

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 : 537

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.7043858
persistent identifier	https://treatment.plazi.org/id/038A8132-EE49-ED65-FC80-CEB8FDA4FCF6
treatment provided by	Plazi
scientific name	Baseodiscus princeps
status

Treatment

BASEODISCUS AFF. PRINCEPS View in CoL (COE, 1901A)

( FIG. 3L, M View Figure 3 )

Material examined: Three specimens. ICHUM 6335, extracted DNA and remaining body preserved in 99% EtOH; 21 July 2012, dredged off Miyako (between 39°38′37″N, 142°11′02″E, 197 m depth, and 39°37′58″N, 142°10′43″E, 193 m depth), Pacific coast of Honshu, Japan, collected by K. Kakui at station ‘kago- 11’ on a research cruse of the R / V GoogleMaps Soyo-maru. ICHUM 6336 View Materials , extracted DNA and remaining body preserved in 99% EtOH; 18 July 2013, dredged off Miyako (between 39°37′52″N, 142°18′13″E, 517 m depth, and 39°37′08″N, 142°17′42″E, 545 m depth), Pacific coast of Honshu, Japan, collected by K. Kakui at station ‘kago-2’ of the R / V GoogleMaps Soyo-maru. One specimen (DNA voucher ICHUM 6337 View Materials ) , 7 July 2011, off Kuril Island (44°36.62′N, 146°26.35′E), Ekaterina Strait, 200 m depth, collected by A. V GoogleMaps . Chernyshev during cruise 41 of the S/ V Akademik Oparin.

Sequences: From ICHUM 6335 View Materials : LC178589 View Materials , 18S (1740 bp) ; LC178617 View Materials , 28S (2101 bp) ; LC178660 View Materials , 16S (505 bp) ; LC190940 View Materials , COI (658 bp). From ICHUM 6336 View Materials : LC178618 View Materials , 28S (2097 bp) ; LC178661 View Materials , 16S (505 bp) ; LC190941 View Materials , COI (658 bp). From ICHUM 6337 View Materials : LC178590 View Materials , 18S (1797 bp) ; LC178619 View Materials , 28S (2089 bp) ; LC178662 View Materials , 16S (505 bp) ; LC190942 View Materials , COI (658 bp) .

Description: Background colour white, dorsally covered with broad, brown longitudinal stripe having numerous tiny perforations through which background colour can be seen; body up to 8 cm long ( Fig. 3L, M View Figure 3 ).

Distribution: North-west Pacific, off Kuril Island (200 m) and off Miyako, Honshu, Japan (193–545 m) (present study). Baseodiscus princeps s.s. was originally described from three different places in Alaska, USA: Cape Fox, Yakutat and Orca (Prince William Sound) ( Coe, 1901a).

Remarks: Although the PTP /bPTP analyses suggested that the three forms herein labelled B. aff. princeps , B. nipponensis and B. cf. princeps are distinct, they are genetically closely related to one another. Uncorrected p -distances for 16S between B. aff. princeps and B. nipponensis were 1.39–1.59%, between B. nipponensis and B. cf. princeps 1.19– 1.39%, and between B. aff. princeps and B. cf. princeps 0.99–1.39%; those for COI between B. aff. princeps and B. cf. princeps were 4.40–4.71% ( Table 4 View Table 4 ). These values are smaller than those between other heteronemerteans that have been confirmed to be biologically distinct by cross-fertilization experiments: between Maculaura alaskensis and M. oregonensis , 4.0% for 16S and 14.3% for COI ( Hiebert & Maslakova, 2015); between Kulikovia alborostrata and Kulikovia fulva , 2.8% for 16S and 14.4% for COI ( Ikenaga et al., 2019).