Search

The 31st IEEE International Symposium on Power Semiconductor Devices and ICs (ISPSD), May 19-23, 2019, Shanghai

Rubyspira brasiliensis Hasegawa, Fujiwara & Okutani sp. nov. (Figs 2–5) Type material. Holotype MZUSP 141885 (Figs 2 A–E). Paratypes, #1 NSMT-Mo 78943 (Figs 2 F–H); #2 NSMT- Mo 78944; #3 NSMT-Mo 78945 (Figs 3, 4); #4 JAMSTEC No. 1130057451; #5 JAMSTEC No. 1130057452. All the specimens are stored in 99% ethanol, except paratype #6, which was used for the examination of the soft parts, including the radula. Shell dimensions and depository of the type series are summarized in Table 1. Additional material examined: MZUSP 141885 (4 exs). Type locality. São Paulo Ridge, Southwest Atlantic (28˚31.12´S, 41˚39.41´W), at a depth of 4204 m, on and around a whale carcass (see Material section for detail). Diagnosis. Shell globose, with an Ampullaria -like appearance, sculptured by fine, crowded spiral cords all over. Umbilicus deeply open. Radula taenioglossate; central, lateral and marginal teeth smooth, completely lacking denticles. Description. Shell (Figs 2, 5) rather thin, globose, with Ampullaria -like appearance, covered by pale strawcolored, filmy periostracum, which occasionally bears weak axial lamellae near labral margin. Protoconch missing in all specimens examined due to corrosion. Teleoconch consisting of at least four roundly inflated whorls with moderately constricted suture. Initial teleoconch whorls with sharp angulation at shoulder, which becomes indistinct on lower whorls. Last whorl large, occupying 89% of shell length. Surface sculptured by fine, crowded spiral cords with narrower interspaces all over. Spiral cords rather uniform in thickness and crowded in basal part of last whorl, but becoming stronger and more irregular adapically, especially on sutural ramp area, where strongest spiral cord sometimes forms weak shoulder keel. 15 or more cords on penultimate whorl, some 40–50 on last whorl. Umbilicus narrow but deep, encircled by indistinct fasciole; inner wall ornamented by weak spiral cords. Aperture semi-circular, entire with no anterior sinus or anal notch. Outer lip smooth, neither reflected nor thickened. Inner lip weakly calloused, continuing to nearly straight columellar lip and barely reflected over umbilicus. Animal (Fig. 3). One probably immature female specimen was examined. Head with relatively large and extremely broad snout and rather blunt cephalic tentacles, lacking pigmented eyes; foot small with propodium and metapodium, separated by narrow lateral groove. Mantle edge simple with small but distinct notch at left corner and simple (not annulate) pallial tentacle in notch in front of anus. Ctenidium well developed, covering nearly one third of pallial roof, and consisting of triangular leaflets. Osphradium relatively small, leaf-like and situated near left corner of pallial roof. Posterior esophagus swollen with soil-like contents, seen through epithelium of mantle floor. Stomach large, comprising large part of ventral side of visceral mass. Rectum also considerably packed with soil-like contents, and sharing most part of right side of pallial roof, especially in its proximal part, leaving little space for gonoduct. Radula (Fig. 4A) taenioglossate, 2-1-1-1-2. Central tooth with ovo-quadrate base and triangular cusp, smooth. Lateral tooth with broad shaft and gently incurved, blunt cusp. Inner and outer marginal teeth gently incurved, with blunt tip; shaft carrying low, lateral wing. All teeth distinctly smooth, with no trace of denticles. Operculum (Fig. 4B) leaf-like in shape, yellowish brown, horny, paucispiral, with indistinct spiral ridge in center. Rather small relative to size of apertural opening. Variation (Figs 5, 6). All the specimens larger than 30 mm in shell length (19 examples) were rather uniform both in general shape and sculpture, except for some minor variations mentioned in the description. Only three empty shells in the present material were small (less than 30 mm in length), and they differ considerably from the larger ones in being more narrowly elongate in shape and possessing finer and more crowded spiral ribs. Because of the absence of live-collected specimens of the latter form, both are provisionally regarded herein as forms or growth stages of a single species. Etymology: The specific epithet brasiliensis refers to the type locality, the São Paulo Ridge, which is located off Brazil. Remarks. Only two Recent species (R. osteovora and R. goffrediae) have previously been known in the genus Rubyspira (Johnson et al. 2010). The present new species is readily distinguished from both by its Viviparus -like globose shell with a widely perforate umbilicus. No other conchologically comparable species in other systematic groups has been found from deep-sea chemosynthetic communities worldwide, including whale falls.

Rissoella golikovi (Gulbin, 1979) (Figs 3 E–F, 5A–G) Jeffreysina golikovi Gulbin, 1979: 89, figs. 1–2 (holotype ZIN 41388 /1; Vanino Bay, Sea of Japan, Russia); Kantor & Sysoev, 2006: 248, pl. 123, fig. E (paratype); Hasegawa, 2017: 398, 1063, pl. 355, fig. 7. Type material not available for analyses. Material examined. Fourteen mature specimens (ICHUM RT3001, RT 3002, RT3003, RO 3001, RO 3002, RO 3003, RK3001, RM 3001, RM 3002, RM 3003, ROM 3001, RA3001, RA 3002, RA 3003). For information on specimens collection locality and GenBank accession numbers see Table 1. Description. Shell minute, smaller (296–450 µm) in comparison to other rissoellids, thin, extremely fragile, translucent or whitish opaque, skeneiform (width about 150% of length), with deep, widely perforate umbilicus (Fig. 5A). Protoconch smooth, of about one whorl (Figs. 5B, C). Teleoconch smooth with distinct growth lines, slightly deep suture, of about three convex whorls; aperture simple, entire, nearly circular but with margin adjacent to previous whorl flattened. Operculum typical of family (Fig. 5D). Head–foot brown or dark grey with colorless sole; oral lobes short; cephalic tentacles slightly longer than oral lobes; oral lobes and cephalic tentacles proximally having similar coloration to head, gradually becoming transparent in distal portion. Mantle dark brown or black pigmented, with black or darker brown patch on center of dorsal portion of body whorl; another smaller dark patch placed on left of neck (Figs. 3E, F). Radular formula 12–13 × 1.R.1 (Fig. 5E). Central tooth higher than wide (width about 52% of length), with medial narrow ridge, cutting edge with one small central sharp cusp flanked by several larger cusps (Figs. 5F, G). Lateral teeth triangular (width about 41% of length), each with median ridge; cutting edge with larger median cusp, flanked by 4–5 sharp cusps, consecutively decreasing in size (Figs. 5E, F). Distribution and microhabitat. Known from Vanino Bay, as well as middle Kurile Islands, Russia. Material in this study was collected from Hokkaido, Japan: Otaru and Kamoenai (Sea of Japan), near Omu (Sea of Okhotsk), and Akkeshi and Muroran (Pacific). It was found on various algae including the coralline algae Corallina spp. Remarks. The type material of Rissoella golikovi was not examined, due to restrictions on shipping biological material. However, our newly sampled material agrees with its description. The present morphospecies is nearly identical in radula morphology to Rissoella globularis (Forbes & Hanley), which has been reported from France to northern Norway, as illustrated by Sars (1878). Nevertheless, these two species can clearly be distinguished by shell morphology. In R. globularis, the shell is depressed conical, while it is skeneiform in R. golikovi. The skeneiform shell of this species makes it easily distinguishable from other species in the family where shells are either ovate or elongate. Rissoella golikovi was first described by Gulbin (1979) from Vanino Bay, Russia, and was subsequently recorded from the eastern part of Hokkaido (Hasegawa 2017)., Published as part of Chira Siadén, Luis E., Wakeman, Kevin C., Webb, Stephen C., Hasegawa, Kazunori & Kajihara, Hiroshi, 2019, Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan, pp. 415-431 in Zootaxa 4551 (4) on pages 419-420, DOI: 10.11646/zootaxa.4551.4.2, http://zenodo.org/record/2623029, {"references":["Gulbin, V. V. (1979) A new species of the littoral gastropod Rissoellidae from the Far-eastern seas. Academy of Sciences of the USSR, Vladivostok. Far East Science Center. Marine Biology, 3, 88 - 89. [in Russian]","Kantor, Y. I. & Sysoev, A. V. (2006) Marine and Brackish Water Gastropoda of Russia and Adjacent Countries: An Illustrated Catalogue. KMK Scientific Pres Ltd., Moscow, 371 pp., 140 pls.","Hasegawa, K. (2017) Rissoellidae. In: Okutani, T. (Ed.), Marine Mollusks in Japan. 2 nd Edition. Tokai University Press, Tokyo, pp. 398 + 1063.","Sars, G. O. (1878) Mollusca regionis Arcticae Norvegiae. In: Bidrag til Kundskaben om Norges Arktiske Fauna. Chritiania, Brogger, 466 pp."]}

Rissoella elatior (Golikov, Gulbin & Sirenko, 1987) (Figs 2 A–D, 3A–H) Jeffreysina elatior Golikov, Gulbin & Sirenko, 1987: 35, pl. 3, fig. 6; Kantor & Sysoev, 2006: 248, pl. 123, fig. D (holotype 36525/1; Moneron Island, Russia). Type material not available for analyses. Jeffreysiella elatior — Hasegawa, 2017: 398, 1063, pl. 355, fig. 6. Material examined. Thirteen mature specimens (ICHUM RT1001, RT 1002, RO 1001, RO 1002, RO 1003, RSH 1001, RSH 1002, RK1001, RK1002, RM 1001, RSU 1001, RSE 1001, and RSE 1002). For information on specimens collection locality and GenBank accession numbers see Table 1. Description. Shell minute (800–1270 µm) but relatively larger if compared to other species described here, thin, fragile, translucent or whitish opaque, elongate (width about 63% of length), with narrow umbilicus, spire of about 25% of total length (Fig. 4A). Protoconch smooth, slightly pointed, of approximately one whorl, without sculpture at suture (Figs. 4B, C). Teleoconch smooth except for faint markings of growth lines; with deep suture; up to 3 ½ convex whorls; aperture simple, entire, semicircular, slightly shorter or almost 50% of total length. Operculum typical of family (Fig. 4D). Head–foot opaque white, with slender oral lobes and longer cephalic tentacles. Mantle brown or black pigmented, with black patch centrally placed on dorsal portion of body whorl. Black patch hardly recognized in specimens with black mantle (Figs. 3 B–D). Radular formula 15–16 × 2.1.R.1.2 (Fig. 4E). Central tooth wide (width about 61% of length), with 7–8 sharp cusps, latter gradually increasing in size from left to right until 6th (or in some cases 7th); right-most cusp slightly smaller than left ones. Group of 10–13 minute secondary cusps encircling upper margin of last right cusp (Figs. 4E, F). Lateral teeth elongate-triangular (width about 78% of length), each with large, sharp, smooth median cusp, and 8–12 smaller cusps along inner and outer margins (Figs. 4E, G). Inner marginal teeth represented by small, curved plates (width about 93% of length), each with large, sharp, smooth median cusp, flanked by 4–5 (along inner margin) or 5–7 (along outer margin) smaller cusps (Figs. 4E, H). Outer marginal teeth reduced, simple, plate-like (width almost 200% of length) (Figs. 4E, H). Distribution and microhabitat. Originally reported from the northern part of the Sea of Japan (Moneron Island) (Golikov et al. 1987), Russia, and subsequently reported to be widely distributed along the Japanese Archipelago from Hokkaido to Miyako Island, Okinawa (Hasegawa 2017). Material in this study was collected from Rumoi to Setana on the Sea of Japan; and on the Pacific coast near Muroran, Japan. It was found on various algae including the coralline algae Corallina spp. Remarks. Although the type specimens of Rissoella elatior have not been examined in this work, our newly sampled material agrees with the original description of this species (Golikov et al. 1987), as well as the photograph of the holotype (Kantor & Sysoev 2006: pl. 123, fig. D). In some specimens (Fig. 3A) the mantle coloration is brighter than others (Figs. 3 B–D), the former being pale brown with yellowish white asymmetrical patches and a brown patch centrally placed on the dorsal portion of the body whorl., Published as part of Chira Siadén, Luis E., Wakeman, Kevin C., Webb, Stephen C., Hasegawa, Kazunori & Kajihara, Hiroshi, 2019, Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan, pp. 415-431 in Zootaxa 4551 (4) on pages 418-419, DOI: 10.11646/zootaxa.4551.4.2, http://zenodo.org/record/2623029, {"references":["Golikov, A. N., Gulbin, V. V. & Sirenko, B. I. (1987) Prosobranch from Moneron Island shelf (Sea of Japan). I. Orders Patelliformes-Calyptraeiformes. In: Fauna and Distribution of Molluscs, North Pacific and Polar Basin, edited by A. Kafanov. Far Eastern Science Center of the USSR Academy of Science, Moscow, pp. 20 - 40.","Kantor, Y. I. & Sysoev, A. V. (2006) Marine and Brackish Water Gastropoda of Russia and Adjacent Countries: An Illustrated Catalogue. KMK Scientific Pres Ltd., Moscow, 371 pp., 140 pls.","Hasegawa, K. (2017) Rissoellidae. In: Okutani, T. (Ed.), Marine Mollusks in Japan. 2 nd Edition. Tokai University Press, Tokyo, pp. 398 + 1063."]}

Rissoella sp. 1 (Figs 3J, 3K) Material examined. Two mature specimens: ICHUM RSH 4001, RSH 4002; Shakotan, Hokkaido, Japan, 43°18′06.2″N 140°35′55.6″E, 25 August 2017. Both specimens were used for DNA extraction. For further information on specimens collection locality and GenBank accession numbers see Table 1. Remarks. Shell minute, thin, fragile, translucent or whitish, elongate. Head–foot translucent white; with very short round oral lobes, long cephalic tentacles with tapering tip, translucent as well. Mantle pigmented in light brown with three or four big yellowish asymmetrical patches. Big black patch, with few small whitish blotches inside, centrally placed on the dorsal portion of body whorl. Visceral mass dark brown to black, with several elongate whitish blotches (Figs. 3J, K). Distribution and microhabitat. Found in Shakotan, Hokkaido, Japan; in the subtidal zone on red algae Gelidium spp.

Rissoella sp. 1 (Figs 3J, 3K) Material examined. Two mature specimens: ICHUM RSH 4001, RSH 4002; Shakotan, Hokkaido, Japan, 43��18���06.2���N 140��35���55.6���E, 25 August 2017. Both specimens were used for DNA extraction. For further information on specimens collection locality and GenBank accession numbers see Table 1. Remarks. Shell minute, thin, fragile, translucent or whitish, elongate. Head���foot translucent white; with very short round oral lobes, long cephalic tentacles with tapering tip, translucent as well. Mantle pigmented in light brown with three or four big yellowish asymmetrical patches. Big black patch, with few small whitish blotches inside, centrally placed on the dorsal portion of body whorl. Visceral mass dark brown to black, with several elongate whitish blotches (Figs. 3J, K). Distribution and microhabitat. Found in Shakotan, Hokkaido, Japan; in the subtidal zone on red algae Gelidium spp., Published as part of Chira Siad��n, Luis E., Wakeman, Kevin C., Webb, Stephen C., Hasegawa, Kazunori & Kajihara, Hiroshi, 2019, Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan, pp. 415-431 in Zootaxa 4551 (4) on page 423, DOI: 10.11646/zootaxa.4551.4.2, http://zenodo.org/record/2623029

Rissoella japonica Chira & Hasegawa, n. sp. (Figs 3 G���I, 6A���G) Rissoella sp.��� Hasegawa, 2000: 700 -701, plate 349, fig. Rissoellidae-1; Hasegawa, 2017: 398, 1063, pl. 355, fig. 5. Type material. Holotype: adult, 0.9 mm (ICHUM RK2001); Kamoenai, Hokkaido, Japan, 43��08���10.5���N 140��25���43.1���E, 6 November 2016. Paratypes: 3 specimens (ICHUM RK2002, RO2001, RO2002) from Oshoro Bay, Hokkaido, Japan; 1 specimen (RSH2001); Shakotan, Hokkaido, Japan. For information on specimens collection locality and GenBank accession numbers see Table 1. ZooBank registration: urn:lsid:zoobank.org:act: E3102674-B307-40F6-A700-7696AE32FCA8 Etymology. The species name, Rissoella japonica, refers to the geographical distribution from where the species was found. Diagnosis. Protoconch with rippled sculpture at suture. Radula, central tooth with 10-13 sharp cusps on cutting edge. Lateral teeth narrow, with median ridge becoming basal process, and outer lateral projection on base; cutting edge with major median cusp, flanked by 5-6 (along outer margin) or 7-9 (along inner margin) sharp cusps. Marginal teeth similar in shape to lateral one but smaller, cutting edge with median cusp, flanked by 3-5 smaller sharp cusps on each side. Description. Shell minute (764���1091 ��m), thin, fragile, translucent or whitish opaque, elongate (width about 67% of length), with narrow umbilicus, spire of about 30% of total length (Fig. 6A). Protoconch smooth, of about 1 whorl, with rippled sculpture along suture (Figs. 6B, C). Teleoconch smooth, with distinct growth lines, deep suture, about 2 �� convex whorls; aperture simple, entire, semicircular, slightly longer than 50% of total length. Operculum typical of family (Fig. 6D). Head���foot dark brown with colorless sole; oral lobes and tentacles dark brown. Mantle dark brown or black pigmented, with black patch placed slightly to left on dorsal portion of body whorl (Figs. 3 G-I). Radular formula 11-13 �� 1.1.R.1.1 (Fig. 6E). Central tooth higher than wide (width about 48% of length), cutting edge with 10���13 sharp cusps of different sizes (Figs. 6E, F). Lateral teeth narrow (width about 23% of length), with median ridge becoming basal process, outer lateral projection on base; cutting edge with larger median cusp, flanked by 5���6 (along outer margin) or 7���9 (along inner margin) sharp cusps (Figs. 6E, G). Marginal teeth with similar shape to lateral one but smaller (width about 33% of length); cutting edge with median cusp, flanked by 3���5 smaller sharp cusps on each side (Figs. 6E, G). Distribution and microhabitat. In the Sea of Japan from Otaru to Setana, Japan. It was found in the intertidal zone on various algae including the coralline algae Corallina spp. Remarks. Both R. japonica n. sp. and R. elatior occur sympatrically in some localities, and they might be confused. However, they can be distinguished by the head-foot coloration (being dark brown in R. japonica n. sp. and white in R. elatior) and the radula morphology, as well as by conchological characters such as spire/total length and aperture/total length ratios. Based on radula morphology, R. japonica n. sp. belongs to a group containing the type species of Rissoella s.s., R. diaphana illustrated by Thiele (1929 ���1935; as R. glabra), in having a symmetrical configuration with five teeth per row. Rissoella japonica n. sp. can be distinguished from R. diaphana by the relatively narrower and smaller central tooth., Published as part of Chira Siad��n, Luis E., Wakeman, Kevin C., Webb, Stephen C., Hasegawa, Kazunori & Kajihara, Hiroshi, 2019, Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan, pp. 415-431 in Zootaxa 4551 (4) on page 423, DOI: 10.11646/zootaxa.4551.4.2, http://zenodo.org/record/2623029, {"references":["Hasegawa, K. (2000) Rissoellidae. In: Okutani, T. (Ed.), Marine Mollusks in Japan. Tokai University Press, Tokyo, pp. 700 - 701.","Hasegawa, K. (2017) Rissoellidae. In: Okutani, T. (Ed.), Marine Mollusks in Japan. 2 nd Edition. Tokai University Press, Tokyo, pp. 398 + 1063.","Thiele, J. (1929 - 1935) Handbuch der systematischen Weichtierkunde. Gustav Fischer, Jena, 1154 pp."]}

High-power conversion systems are based not only on three-phase inverters but also on single-phase inverters because modular multilevel cascade converters (MMCC) consist of half- or full-bridge single-phase converters. Their DC-link capacitors are a major constraint on the improvement of power density as well as of reliability. Evaluation of dc-link capacitors in terms of power loss, ageing, and failure rate will play an important role in the next-generation power converters. This paper presents an evaluation circuit for dc-link capacitors used in a high-power single-phase PWM inverter. The evaluation circuit produces a practical ripple current waveform and a dc bias voltage into a capacitor under test with a downscaled voltage-rating inverter, which is equivalent to those of the full-scale inverter. Theoretical analysis and experimental results verify the effectiveness of the evaluation circuit, PCIM Europe 2017, 16 – 18 May, 2017, Nuremberg, Germany