Tetrarca boucardi ( Jousseaume, 1894 )

Lisitsyna, Kseniya N. & Kamenev, Gennady M., 2024, New and rare bivalve species for the fauna of the Kuril Islands (northwestern Pacific Ocean): A study of materials collected over 70 years of expeditions (from 1949 to 2019), Zootaxa 5523 (2), pp. 231-253 : 239

Tetrarca boucardi ( Jousseaume, 1894)

( Fig. 2 Q, R )

Arca boucardi Jousseaume, 1894: 41 .

Tetrarca boucardi ( Jousseaume, 1894) — Vermeij & Amano 2021: 44.

Material examined: eight specimens from the sea slope of the southern Kuril Islands ( Iturup and Kunashir Islands) and the Shpanberg Strait (5–55 m) .

Distribution: Yellow Sea; Taiwan; Okinawa, Kyushu to Hokkaido; Sea of Japan; south Kuril Islands, Shpanberg Strait (0–68 m) ( Scarlato 1981; Darkina & Lutaenko 1996; Evseev 2000; Matsukuma & Okutani 2000, 2017; Kantor & Sysoev 2005; Lutaenko & Maestrati 2007; Liu 2008; Nobetsu & Yamazaki 2011; Lutaenko & Noseworthy 2012; Lee 2013).

Remarks: Previously, this warm-water species was recorded only from off Kunashir Island ( Evseev 2000). New findings of Tetrarca boucardi ( Jousseaume, 1894) have extended the range of this species northward along the Kuril Islands to Iturup. Lutaenko & Maestrati (2007) indicated that T. boucardi was found at depths to 175 m, but it is not completely clear whether those findings were live-collected individuals or empty shells.

Figures

FIGURE 2. New and rare bivalve species for the fauna of the Kuril Islands. (A, B) Acila divaricata (Kunashir Strait, 200 m, shell length 29.7 mm). (C, D) Acila insignis (Yuri Island, 1000 m, shell length 11.0 mm). (E, F) Nuculana ensiformis (Shikotan Island, 200 m, shell length 22.5 mm). (G, H) Poroleda ushakovi (Shumshu Island, 820 m, shell length 17.1 mm). (I, J) Robaia robai (Kunashir Strait, 300 m, shell length 16.3 mm). (K, L) Yoldia hyperborea (Paramushir Island, 215 m, shell length 19.0 mm). (M, N) Scanning electron micrographs of Huxleyia pentadonta (Paramushir Island, 214 m, shell length 2.3 mm). (O, P) Samacar kurilensis (Iturup Island, 265–270 m, shell length 16.5 mm). (Q, R) Tetrarca boucardi (Shpanberg Strait, 55 m, shell length 20.0 mm). (S, T) Limopsis oliveri (Urup Island, 50 m, shell length 9.0 mm). (U, V) Limopsis vaginata (Iturup Island, 600 m, shell length 26.3 mm).