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

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.

Kingdom

Animalia

Phylum

Nemertea

Class

Pilidiophora

Order

Heteronemertea

Family

Valenciniidae

Genus

Baseodiscus

Loc

Baseodiscus takakurai

Kajihara, Hiroshi, Abukawa, Shushi & Chernyshev, Alexei V. 2022
2022
Loc

Eupolia sp.

Takakura U 1898: 185
1898
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