Leptochiton belknapi Dall, 1878

Schwabe, Enrico, 2008, A summary of reports of abyssal and hadal Monoplacophora and Polyplacophora (Mollusca) *, Zootaxa 1866, pp. 205-222 : 213-214

Leptochiton belknapi Dall, 1878

Leptochiton belknapi Dall 1878: 1 .

While the species was originally described from the Bering Sea of the Alaskan Aleutian Islands, from a depth

of 1840 m “only”, there are subsequent deeper records of this species from the following localities:

­ specimen number unknown; [described as Leptochiton benthus , which is a junior synonym] from the North Pacific, 15° north of Hawaii (35°41'N, 157°42'E), 4206 m ( Haddon 1886)

­ specimen number unknown; [described as Lepidopleurus mesogonus , which is a junior synonym] from Canada, British Columbia, off the Queen Charlotte Islands [53°06’N, 132°14’W], 2904 m ( Dall 1902)

­ specimen number unknown; [described as Lepidopleurus halistreptus , which is a junior synonym] from Mexico, off Acapulco (14°46'N, 98°40'W), 3436 m ( Dall 1902) [locality data from Dall 1908]

­ 3 specimens [described as Lepidopleurus giganteus , which is a junior synonym] from Indonesia, south of Sulawesi Tengarra, Banda Sea (06°24'S, 124°39'E), 2798 m ( Nierstrasz 1905)

­ specimen number unknown; [described as Lepidopleurus opacus , which is a junior synonym] from the Gulf of Panama (07°05'30''N, 79°40'W), 2323 m ( Dall 1908)

­ specimen number unknown; [described as Lepidopleurus opacus ] from between the Galapagos Islands and the Peruvian coast (04°33'S, 87°42.5'W), 3667 m ( Dall 1908)

­ 1 specimen [as Lepidopleurus (Leptochiton) benthus ( Haddon, 1886) ] from the eastern Pacific (15°N, 125°W), 4000 m ( Hanselman 1977)

­ Lepidopleurus benthus ( Haddon, 1886) was generally mentioned as occurring at a depth below 4000 m ( Sirenko 1977)

­ 4 specimens [as Leptochiton alveolus ] from the United States of America, Oregon, off Lincoln County (44°33.5'N, 125°14.6'W), 2000 m ( Ferreira 1979) [this is “CASIZ RV Ancona ”, data from: http:// www.calacademy.org/research/izg/iz_coll_db/index.asp]

­ 3 specimens [as Leptochiton alveolus ] from the United States of America, California, 10 miles SE off Farallon Islands, SW by S1/4 S (37°48'N, [122°58’W]), 2341–2741 m ( Ferreira 1979) [this is “CASIZ USS Mulberry; RV Scofield ”, data from: http://www.calacademy.org/research/izg/iz_coll_db/index.asp]

­ 3 specimens [as Leptochiton alveolus ] from Mexico, off Nayarit, Las Tres Marias Islands (21°25'N, [106°28’W]), 2996–2999 m ( Ferreira 1979) [this is “CASIZ 009520”, data from: http://www.calacademy.org/research/izg/iz_coll_db/index.asp]

­ 1 specimen [as Leptochiton alveolus ] from Japan, near Northern Honshu, 2500 m ( Ferreira 1979) [this is “CASIZ 001818”, data from: http://www.calacademy.org/ research/izg/iz_coll_db/index.asp]

­ 1 specimen [as Leptochiton alveolus ] from off Baja California Sur southwest of Cabo San Lucas (22°30.8'­ 22°37.2'N, 110°03.8'­ 110°15.5'W), 2507–2891 m ( Ferreira 1980)

­ 1 specimen from off northeastern Honshu, Japan (38°21.7'N, 143°25.9'E), 2930–3020 m ( Wu & Okutani 1984)

­ 4 specimens from south of Izu­Shoto, Japan (30°37.0'N, 140°40.5'E), 2140 m ( Wu & Okutani 1984)

­ 1 specimen from Izu­Shoto, Japan (31°58.1'N, 140°21.0'E), 2230–2245 m ( Wu & Okutani 1984)

­ 1 specimen from the Philippines (06°08'N, 125°58'E), 2800 m (Kaas 1990)

­ 2 specimens from the Philippines (05°02'N, 125°15'E), 3250 m (Kaas 1990)

­ 1 specimen from the Philippines (14°05'N, 120°02'E), 2050 m (Kaas 1990)

­ specimen number unknown; from the Commander Islands [54°48’N, 166°59’E], 100–4400 m ( Sirenko & Agapova 1997)