Baseodiscus takakurai, GIBSON, 1995

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 : 523-525

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.7036927

persistent identifier

https://treatment.plazi.org/id/038A8132-EE7F-ED50-FC90-CFE6FE11FD91

treatment provided by

Plazi (2022-08-29 10:10:32, last updated 2024-11-26 02:52:19)

scientific name

Baseodiscus takakurai
status

 

BASEODISCUS TAKAKURAI GIBSON, 1995 View in CoL View at ENA

( FIGS 2F View Figure 2 , 6A–E View Figure 6 )

Eupolia sp. : Takakura, 1898: 185, fig. 8 (Misaki, Japan).

Baseodiscus takakurai Gibson, 1995: 304 View in CoL , 367; Kajihara, 2017: 423, fig. 16.2.

Material examined: ICHUM 6266 View Materials , transverse sections, 5 µm thick, Mallory , 43 slides, along with unsectioned body fragment in 99% EtOH; March 2012, under stone, subtidal, 10 m depth , SCUBA diving, mouth of Koajiro Bay (35°09′51″N, 139°36′53″E), K a n a g awa, Ja p a n, c o l l e c t e d b y H. K o h t s u k a GoogleMaps . ICHUM 6306 View Materials , body fragment in 99% EtOH, 4 June 2012, among laminarian holdfasts, rocky intertidal, Oshoro Bay (43°12′43″N, 140°51′13″E), Hokkaido, Japan, collected by H. Kajihara. GoogleMaps ICHUM 6307 View Materials , body fragment in 99% EtOH, collection data same as for ICHUM 6266 GoogleMaps . ICHUM 6309 View Materials , body fragment in 99% EtOH, juvenile, 18 April 2014, among roots of the seagrass Phyllospadix iwatensis Makino, Oshoro Bay , Hokkaido, Japan, collected by H. Kajihara. ICHUM 6308 View Materials , anterior body fragment (~70 cm long) in 99% EtOH, 24 August 2016, among sunken scallop shells used for sea cucumber mariculture, 5 m depth, 300 m offshore, Date (42°27′30″N, 140°52′03″E), Hokkaido, Japan, collected by H. Kajihara. GoogleMaps

Sequences: From ICHUM 6266 View Materials : LC178612 View Materials , 28S (2120 bp) ; LC178645 View Materials , H3 (331 bp) ; LC178654 View Materials , 16S (507 bp). From ICHUM 6306 View Materials : LC178583 View Materials , 18S (1795 bp) ; LC178610 View Materials , 28S (2094 bp) ; LC178652 View Materials , 16S (506 bp). From ICHUM 6307 View Materials : LC178611 View Materials , 28S (2121 bp) ; LC178644 View Materials , H3 (331 bp) ; LC178653 View Materials , 16S (507 bp) ; LC190937 View Materials , COI (658 bp). From ICHUM 6309 View Materials : LC178584 View Materials , 18S (1793 bp) ; LC178613 View Materials , 28S (2120 bp) ; LC178646 View Materials , H3 (331 bp) ; LC178655 View Materials 16S (507 bp) ; LC190938 View Materials , COI (658 bp) .

Description: Background body colour wheat to light orange, mottled with black to dark brown patches of varying size and shape ( Figs 2F View Figure 2 , 6A, B View Figure 6 ); body markings uniformly distributed both dorsally and ventrally in large specimens, but only dorsally in juveniles ( Fig. 6C, D View Figure 6 ). Head demarcated from body with transverse cephalic furrow; secondary furrows present. Mouth mid-ventral, behind cephalic furrow ( Fig. 6A View Figure 6 ). Eyes numerous, arranged along cephalic margin on each side, also on dorsal surface of head just anterior to cephalic furrow (sparse near midline). No caudal cirrus. Proboscis pore terminal. Rhynchocoel wall consisting of inner longitudinal and outer circular muscle layers. Proboscis wall composed of glandular epithelium, neural plexus, outer longitudinal muscle layer, and inner circular muscle layer ( Fig. 6E View Figure 6 ).

Distribution: So far confirmed only from eastern Japan: Misaki, Honshu (type locality; Takakura, 1898; present study); Date, Hokkaido (present study); and Oshoro, Hokkaido (present study).

Remarks: Takakura (1898) recorded an unidentified form as Eupolia sp. , stating that it resembled Eupolia antillensis Bürger, 1895a . Gibson (1995) mistakenly thought that Takakura (1898) had established a new taxon with the specific name antillensis , and introduced the new name Baseodiscus takakurai for Takakura’s (1898) Eupolia sp.

Burger O. 1895 a. Die Nemertinen des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. Fauna und Flora des Golfes von Neapel und der Angrenzenden Meeres-Abschnitte,

Gibson R. 1995. Nemertean genera and species of the world: an annotated checklist of original names and description citations, synonyms, current taxonomic status, habitats and recorded zoogeographic distribution. Journal of Natural History 29: 271 - 561.

Kajihara H. 2017. Species diversity of Japanese ribbon worms (Nemertea). In: Motokawa M, Kajihara H, eds. Species diversity of animals in Japan. Tokyo: Springer Japan, 419 - 444.

Takakura U. 1898. Misaki kinbosan himomushirui (Nemertine) no bunrui [A classification of nemerteans from the vicinity of Misaki]. Dobutsugaku Zasshi 10: 38 - 44, 116 - 120, 184 - 187, 331 - 337, 424 - 429. [In Japanese]

Gallery Image

Figure 2. A, Eopilidion misakiense gen. et sp. nov., holotype, ICHUM 6303, lateral view, head to the right; B, Oxypolella hiebertae sp. nov., holotype, MIMB 42256; C, Cephalomastax brevis Iwata, 1957, ICHUM 6304; D, E, Valencinura jambio sp. nov., holotype, ICHUM 6305, anterior body fragment (D) and enlargement of intestinal region (E) showing yellowish proboscis (indicated by arrowheads); F, Baseodiscus takakurai Gibson, 1995, ICHUM 6306; G, Baseodiscus profundus sp. nov., holotype, MIMB 42257; H, I, Baseodiscus narusei sp. nov., holotype, ICHUM 6310, anterior end of body, dorsal (H) and ventral (I) views; J, Baseodiscus paracelensis sp. nov., holotype, MIMB 33132; K, Baseodiscus komatsui sp. nov., holotype, NMNS-Ne 1; L, Baseodiscus unicolor Stiasny-Wijnhoff, 1925; M, Baseodiscus giribeti sp. nov., holotype, MCZ IZ-135324; N, Baseodiscus cf. amboinensis (Staub, 1900); O, Baseodiscus hemprichii (Ehrenberg, 1828-1831), specimen from Okinawa, different from any voucher specimens in this study; P, Baseodiscus zebra sp. nov., holotype, RUMF-ZN-00001; Q, Baseodiscus quinquelineatus (Quoy & Gaimard, 1833), ICHUM 6319. Photographs by H. Kajihara (A, C, D, E, F, O), A.V. Chernyshev (B, G, J), T. Naruse (H, I), H. Komatsu (K), G. Giribet (L, M), D. Uyeno (P), and R.Yoshida (Q).

Gallery Image

Figure 6. A–E, Baseodiscus takakurai Gibson, 1995, ICHUM 6308, A, anterior end of body, ventral view; B, middle body region, showing appearance of body markings in differently contracted states; C, juvenile, showing dorsal mottling; D, juvenile, with head viewed ventrolaterally, showing two ocelli; E, transverse section of proboscis; F, Baseodiscus komatsui sp. nov., holotype, NSNM NMNS-Ne 1, entire body. Photos by H. Kajihara (A–E) and H. Komatsu (F).

Kingdom

Animalia

Phylum

Nemertea

Class

Pilidiophora

Order

Heteronemertea

Family

Valenciniidae

Genus

Baseodiscus