H 7Ts?Fiit the Oenopotinae(Gastropoda:Turridae
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The malacologicalsocietymalacological society of Japan Hre VEts'US(Jap. Jour. Matuc,) -4] VoL 51, Nos.1&2(1992)/11 H 7ts v > 7tf" ･ Se ?fiitiii]FkltwEl Y' i [rtEN(iva,Ell an 7 Y"v7 lf"i N) CaDv)( I.P. ;tt 7" S" / 7 ･ i#eswr=F-t" { Jq. v s)': ･ H 2tsc fiJ It H'hr' ( 7 .Kl ) O'[' ?reLXrkti yhe.) The Oenopotinae (Gastropoda: Turridae) Mollusks from the Southeastern of the Part Japan Sea Igor P. BoGDANov and Katsuchiyo ITo (Dept. of lnvertebrate Zoology, Biological Faculty, Moscow State University, 119899 Russia and ex-Japan Sea Regional Fisheries Research Laboratory, Suido-cho, Niigata 951, Japan) Abstract: Twenty-seven species of the Subfamily Oenopotinae of the Family Turridae were materiats that identified in the had been previously reported by Ito (1967, 1985, 1989) and Ito et al. (1986) from Japan Sea. Among them 21 species among which three are new to science are described and illustrated. The most of them are widely distributed subarctic species, but ranges of a few species seem to be limited in Japan Sea coast of Honshu, This study is an attempt to summarize the material, which was collected recently. The material consists of one of the most interesting groups of the family Turridae, the subfami- ly Oenopotinae, which is mainly distributed in the North Polar Basin. All the reviewed material was collected by the junior author (Katsuchiyo Ito) in different areas of the Japan Sea near the coast of Honshu, the region of Ishikawa and Niigata Prefeetures at depths from 200 to 350 metres. The photos of the part of the Oenopotinae shells were early pub]ished by Ito without descriptions or diagnoses and sometimes without the specific determination (Ito, 1967, 1985, 1989, Ito et al., 1986), The geographical ceordinates of Tab]e 1. Collecting stations of specimens under report (I-series) Station Date Coordinate Depth (m) I-1I-2I-3I-4l-51-614.06,1980 37eOl,O N-136022.0 E 2S531431820S25025S 26.06.1980 37012,7 N-.137e12.1 E 25.06.1980 37014,6 N-137e12.9 E 13.06.1980 37D05.5 N-136025.0 E 13.06.1980 37004.4 N-136e22.1 E 14.06.1980 36057.0 N-136e21,9 E NII-Electronic Library Service t/society The malacological society of Japan 12 VENUS: Vol. 51, Nos.1&2(1992) the I-series stations are given in Table 1. The locality accompanying S designated off Sado Island where sampling was done during August 1981 till July 1982. All stations are fallen within the range within: 38"08.1-08.6N, 138e44.0-44.6eE, 200-300 m deepl 38002.5-03.2N, 138e38.3-38.7E, 200-275 m deep, Summarizing up the material and literature data, it became clear that Oenopotinae fauna of the southeastern part of the Japan Sea is represented by five genera and 27 species. Genus Curtitoma Bartsch, 1941 1. Curtitoma violacea (Mighe)s et Adams, 1842) (Figs. Ia-e, 22) Pteurotoma bicarinata Couthouy, 1838 (non W. Wood, 1828): 104, pl. 1, fig. 11. Pteurotoma violacea Mighels et Adarns, 1842: 51, pl. 4, fig. 21. Dqf7ancia livida MO]ler, 1842: 14. Bela violacea var. cylindracea MOrch, 1868: 215, Beta bicarinata var. ruLfescens G.O. Sars, 1878: 238, tab. 16, fig. 11. Bela bicarinata var. ge,ninotineata Friele, 1879: 277; 1886: 16, pl. 8, fig. 19. Bela minuscularia LocaTd, 1897: 2S9, pr. 12, fig, 28-30. Nbmatoma sp., Ito, 1985: 29, pl, 7, fig. 4. Propebela sp. No. 9, Ito, 1985: 30, pl. 8, fig. 3. IVbmatoma sp, No. 3, Ito, 1986: 17, pl. 21, fig. 4. Benthomangelia ? sp. Ito, 1989: 52, pl. 12, fig. 7. The shell is fusiform, small, from 6 to 8 mm in height, consists of 4.5-5 whorls. well-defined ribs. as a rule, The spiral sculpture is represented sometimes by two But, there are two more spiral ribs. In some cases, spiral elements are deve!oped on the pro- toconch, but absent on the definitiye shell whorls. It is worth to mention that this species is characterized by significant variety of sculptures, The axial sculpture is developed to some extent. It is represented by the folds evenly developed on the whorl surface, straight on the periphery of the whorl and sigmoidally curved on the shoulder. Protoconch has a large number of microscopic granules, concentrated on the spiral ribs. Remarks: The species is well separate from other Curtitoma species by fusiform shell and two or more well-defined spiral ribs. A great variability of spiral and axial sculptures and the shell polymorphism caused the previous investigators to create a lot of new species. But, all of them are the infraspecific variety of Curtitoma violaeea because of the identical morphology of the radular tooth. Distribution: The boreal-arctic, widely spread species. It is distributed in all arctic seas, and is found in the boreal regions of the Atlantic and Pacific Oceans. It was recorded from the Canadian Arctic : Labrador Strait, British Columbia, Newfoundland, New England, Massachusetts, western and eastern parts of Greenland, west Ireland and Iceland, near the coast of Norway, Spitzbergen, in Barentz and White Seas, near the islands of Franz- Josef Land, Novaja Zemlja, Severnaja Zemlja, in the Laptev Sea near Novosiberian Islands NII-Electronic Library Service The malacologicalsocietymalacological society of Japan Bogdanov-Ito: Oenopotinae from Japan Sea 13 and in the Chukotski Sea near Wrangel Island, It is also found in the Bering Sea, off the coast of eastern Kamchatka and in the Okhotsk Sea. In the Japan Sea it was recorded in the Tartary Strait and near the Primorie coast. It was found near the Japanese coast at Stations S-67, 59 and S-52. 2. Curtitoma decussata (Couthouy, 1839) (Figs. 2a-b) Pleurotoma decussata Ceuthouy, 1839: 183, pl. 4, fig. 8. Pleurotoma tenuicostata M. Sars, 1868: 259 (nomen nudum). Bela tenuicostata var. wiltei Friele, 1886: 13, pl. 8, fig. 16, 17, pl. 10, fig. 14 (radula). Bela willei Kobelt, 1905: 254, pl, 84, fig, 6. IVlematoma dissoluta Ito, 1989: 52, pl. 12, fig. 2-3. The shell is oval or oval-fusiform, small, from 8 to 9 mm in height, consists of 4-5 whorls. (Dimensions of the holotype: 8.7 mm in height of the shell (H) and 3,7 mm in body whorl diameter (D). The maximum sizes of the shell from Massachusetts: H= 12,5, D=6,O mm). The spiral sculpture is represented by thread-like ribs, which are, usually 2-3 times wider than spaces between them. The ribs are equal in size on the whole surface of the whorl and the base of the shell. The axial sculpture is represented by numer- ous thin folds (from 14 to 34 in number) divided by spaces equal in width to the folds, The most developed folds are on the shoulder and on the upper part of the periphery. They are obsolete on the base. The characteristic feature of the species is the flattened shell base, transforming into the siphonal canal. Remarks: This species is close to C. Iawrenciana by radular morphology and the shell form. but can be distinguished therefrom by numerous thin axial folds. Distribution : Boreal and arctic parts of the North Pacific, spread in the East Siberian, Kara, Laptev and Chukehi Seas, in the Labrador, near the New Scotland coast, in the Massachusetts Bay and in Canadian Arctic, in the Bering, Okhotsk and Japan Seas. It was found near the Japanese coast at Stn. [-5. 3. Curtitoma becklemishevi Bogdanev, 1989 (Figs. 3a-g, 23) iVematoma hokkaidoensis Okutani, 1964 (non Bartsch, 1941): 431, pl, 7, fig. 9; 1966: 24, pl, 2, fig. 8, 9; Ito, 1985: 29, pl. 7, fig. 5: lto, 1989: 52, pl, 12, fig, 1. Curtitoma becklemishevi Bogdanov, 1989: 134, fig. 1, 1-2; 2, a-b. Propebela sp. No. 3, rto et al., 1986: 18, pl, 23, fig, 1. The shell is oval-fusiform, light-gray, with thin walls. (Dimensions of the holotype: H=7,7, D=3.9 rnm.) The spiral sculpture is represented by string-like ribs, which are equally spaced and are of the same size on the whole surface of the shell. The axial sculp- ture is represented by thin folds, which have a deep sigmoidal bend on the shoulder. NII-Electronic Library Service The malacologicalsocietymalacological society of Japan 14 VENUS: Vol. 51, Nos,1&2(1992) There are from 14 to 18 folds on the body whorl and from 13 to 16 on the penultimate one. may separated elongate Remarks: This species isthe closest to C, hebesbut be by its siphonal canal and more round shell base. Distribution: The Asian boreal parts of the North Pacific. Okhotsk (51010'N- 154017'E), in the Tartary Strait and near the Primorie coast. It was found near the Japanese coast at Stn. I-1, I-2, I-3, S-48, S-S8 and S-60. 4. Curtitoma trevelliana (Tllrton, 1834) (Figs. 5a-c) reticulata figures);1844: 8, fig. 29-30. Pleurotoma Brown, 1827: pl.48,fig.29, 30 (only pl.5, Pteurotoma tneveUianum Turton, 1834: 351. 1886: 12, 8, 11-13. Beta decussata var. .finmarchia Friele, pl, fig. shell or turretiform, small, 4.5 mm in height. The Iargest The isfusiferm from to 8.0 ±= specimen from Murmansk is H= 10.6, D=5.2, hb.;7.7 (height of body whorl), h, 5.4 (height of aperture); d=2.3 mm (width of aperture). The spiral sculpture is represented by fine striae on the shoulder and string-like ribs on the other surface of the whorl and on the shell base. As a rule, the most developed rib lies on the shoulder and in some specimens it becomes the keel.