Baseodiscus princeps (Coe 1901)
- Dataset
- Exploring the basal topology of the heteronemertean tree of life: establishment of a new family, along with turbotaxonomy of Valenciniidae (Nemertea: Pilidiophora: Heteronemertea)
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Nemertea
- class
- Pilidiophora
- order
- Heteronemertea
- family
- Valenciniidae
- genus
- Baseodiscus
- species
- Baseodiscus princeps
description
(FIG. 3 L, M) 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 Soyo-maru. ICHUM 6336, 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 Soyo-maru. One specimen (DNA voucher ICHUM 6337), 7 July 2011, off Kuril Island (44 ° 36.62 ′ N, 146 ° 26.35 ′ E), Ekaterina Strait, 200 m depth, collected by A. V. Chernyshev during cruise 41 of the S / V Akademik Oparin. Sequences: From ICHUM 6335: LC 178589, 18 S (1740 bp); LC 178617, 28 S (2101 bp); LC 178660, 16 S (505 bp); LC 190940, COI (658 bp). From ICHUM 6336: LC 178618, 28 S (2097 bp); LC 178661, 16 S (505 bp); LC 190941, COI (658 bp). From ICHUM 6337: LC 178590, 18 S (1797 bp); LC 178619, 28 S (2089 bp); LC 178662, 16 S (505 bp); LC 190942, 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. 3 L, M). 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, 1901 a). 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 16 S 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). 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 16 S and 14.3 % for COI (Hiebert & Maslakova, 2015); between Kulikovia alborostrata and Kulikovia fulva, 2.8 % for 16 S and 14.4 % for COI (Ikenaga et al., 2019).