Leptochiton torishimensis ( Wu & Okutani, 1984 )

Sirenko, Boris, 2018, Taiwanese deep-water chitons (Mollusca: Polyplacophora) and survey of chiton fauna of Taiwan, Zootaxa 4422 (3), pp. 301-344: 322

publication ID

https://doi.org/10.11646/zootaxa.4422.3.1

publication LSID

lsid:zoobank.org:pub:225024A4-A643-4F17-9A8D-4905DC236330

persistent identifier

http://treatment.plazi.org/id/985187DA-FFA3-FFE1-FF34-2D6BFE11FB00

treatment provided by

Plazi

scientific name

Leptochiton torishimensis ( Wu & Okutani, 1984 )
status

 

Leptochiton torishimensis ( Wu & Okutani, 1984) 

( Figs 23–25View FIGURE 23View FIGURE 24View FIGURE 25)

Hanleyella tоrishimensis  Wu & Okutаni 1984: 10, pl. 5, figs. 10–14View FIGURE 10View FIGURE 11View FIGURE 12View FIGURE 13View FIGURE 14, pl. 7, figs. 1–11View FIGURE 1View FIGURE 2View FIGURE 3View FIGURE 4View FIGURE 5View FIGURE 6View FIGURE 7View FIGURE 8View FIGURE 9View FIGURE 10View FIGURE 11.

Leptосhitоn tоrishimensis  ; Sаito 1997: 44, pl. 1, fig. 7 View Figure ; 2001: 110; 2005: 103, fig. 2 View Figure .

Type material. Holotype ( UCMAbout UCM No. 30966), 1 paratype ( UCMAbout UCM No.31840), and 3 paratypes ( NMNSAbout NMNS No. 60006)

Type locality. Near Torishima Island , Japan, 31°7.8’N, 139°54.9’E, 310 m.GoogleMaps 

Material examined. Taiwan, Bashi Channel N/O Fishery Researcher 1, “ TAIWAN 2000”, stn CP38, 21°32.1’N, 120°48.1’E, 1314–1317 m, 9 spms, BL 4.0–7.0 mm, 01.08.2000; NE coast of Taiwan, off Tashi, Fishing Boat Chung Tung Long N26, stn CP76, 24°56.5’N, 122°01.5’E, 115–170 m, 3 spms, BL 4.5–8.0 mm, 0 7.05.2001.

Distribution. Izu Islands, 310 m (S.- K. Wu & Okutani 1984), Suruga Bay, 200–350 m ( Saito 2001), Tosa Bay, 177–220 m ( Saito 2001), Amami-Oshima Island, 288–311 m ( Saito 2005), and Taiwan, 170–1314 m (this study). The species is reported from Taiwan waters for the first time and this find extends the distribution and depth range of this species considerably.

Remarks. The specimens from Taiwan are similar to the specimens from Suruga Bay, Japan in their tegmentum sculpture ( Saito 1997) and resemble specimens from Nansei Islands regarding the radula ( Saito 2005) but it differs from the type specimens from Torishima Island, Japan by the absence of irregular radial rows of granules in lateral areas of intermediate valves and the postmucronal area of tail valve ( Wu & Okutani 1984).

The disarticulated specimen from Taiwan (stn CP76, BL 8.2 mm) has ten gills on each side extending from valve VI to anus and a radula that is 2.5 mm long with 41 transverse rows of mature teeth. The girdle is covered by long scales (43 x 18 µm) with 5–6 riblets and by scattered flattened needles (90 x 17 µm) with 4–5 riblets on distal half. Marginal needles are similar to the dorsal ones. The ventral side of the girdle is clothed with long, smooth, pointed scales (60 x 18 µm). Each suture has up to five smooth delicate needles. There are five aesthete pores in each granule on the tegmentum.

UCM

University of Colorado Museum of Natural History

NMNS

National Museum of Natural Science

Kingdom

Animalia

Phylum

Mollusca

Class

Polyplacophora

Order

Neoloricata

Family

Leptochitonidae

Genus

Leptochiton

Loc

Leptochiton torishimensis ( Wu & Okutani, 1984 )

Sirenko, Boris 2018

2018
Loc

Hanleyella tоrishimensis

: 10

Loc

tоrishimensis

: 44