Ischnochiton boninensis Bergenhayn, 1933
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publication ID |
https://doi.org/10.3897/BDJ.12.e134521 |
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DOI |
https://doi.org/10.5281/zenodo.13983692 |
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persistent identifier |
https://treatment.plazi.org/id/717A10D7-2C9F-514F-B545-D3DADC0AC1E5 |
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treatment provided by |
Biodiversity Data Journal by Pensoft (2024-10-23 16:20:01, last updated by Admin 2024-10-23 17:52:17) |
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scientific name |
Ischnochiton boninensis Bergenhayn, 1933 |
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Ischnochiton boninensis Bergenhayn, 1933 View in CoL
Ischnochiton boninensis Bergenhayn (1933): 10–13, taf. 1, figs. 2, 3, taf. 2, figs. 24–29, 32, textfig. 3; Taki (1938): 369, 373, 375; Kang (1971): 52; Kaas and Van Belle (1980): 18; Kaas and Van Belle (1998): 33; Kira (1982): 183, pl. 67, fig. 2; Saito (1995): 105; Saito (2000): 12, 13, pl. 6, fig. 15; Saito (2017): 732, pl. 4, fig. 11; Slieker (2000): 98, 99, pl. 37, fig. 10; Owada (2016): 5, 6, figs. 4 A – E, 5 A – E; Sirenko and Zhang (2019): 6, fig. 2 B. View in CoL
Ischnochiton zebrinus Bergenhayn (1933): 13–15, taf. 1, fig. 4, taf. 2, figs. 30, 31, 33–39, textfig. 4; Taki (1938): 375; Taki (1964 a): 342. View in CoL
Ischnochiton (Ischnochiton) boninensis View in CoL : Taki (1962): 43; Higo (1973): 6; Yum (1988): 20, 21, pl. 1, fig. 4, pl. 8, pl. 23, figs. 1, 2, pl. 28, fig. 4; Kaas and Van Belle (1990): 184 –186, fig. 83, map 39; Higo et al. (1999): 27; Lee and Min (2002): 94; Min et al. (2004): 70, 71, fig. 8.
Ischnochiton (Ischnochiton) comptus (Gould) View in CoL forma isaoi: Taki (1964 a): 348, text-figs. 2, 4, 6; Taki (1964 b): 408; Higo (1973): 6; Higo and Goto (1993): 3.
? Ischnochiton (Ischnochiton) zebrinus View in CoL : Taki (1962): 43; Taki (1964 b): 408; Higo (1973): 6; Higo and Goto (1993): 3; Higo et al. (1999): 27.
Ischnochiton (Simplischnochiton) boninensis View in CoL : Van Belle (1982): 470; Dell'Angelo et al. (1990): 36, 37.
Materials
Type status: Other material. Occurrence: individualCount: 3; occurrenceID: B04F80DF-C510-566A-9E5A-CEEA8BBADF80; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Jongdal-ri, Gujwa-eup, Jeju-si, Jeju-do ; verbatimCoordinates: 33°29'16.84"N, 126°54'41.37"E; Event: eventDate: 26 Jan 2015 GoogleMaps
Type status: Other material. Occurrence: individualCount: 5; occurrenceID: C8673915-9FF2-5CC2-AC00-144DD7F27CAD; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Jongdal-ri, Gujwa-eup, Jeju-si, Jeju-do ; verbatimCoordinates: 33°29'16.84"N, 126°54'41.37"E; Event: eventDate: 21 Dec 2015 GoogleMaps
Type status: Other material. Occurrence: individualCount: 1; occurrenceID: 283FB9B8-108F-585F-B330-D280BD77DF60; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Daejeong-eup, Seogwipo-si, Jeju-do ; verbatimCoordinates: 33°14'27.09"N, 126°13'21.24"E; Event: eventDate: 02 Jul 2016 GoogleMaps
Type status: Other material. Occurrence: individualCount: 2; occurrenceID: 7BB82550-EA20-5A66-931F-2117EB63AA04; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Is. Mun, Seogwi-dong, Seogwipo-si, Jeju-do ; locationRemarks: collected by SCUBA-diving; verbatimCoordinates: 33°13'31.06"N, 126°33'54.57"E; Event: eventDate: 26 Mar 2019 GoogleMaps
Type status: Other material. Occurrence: individualCount: 1; occurrenceID: 8B88C27E-086E-5F4E-B663-D333BF8D776F; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Is. Mun, Seogwi-dong, Seogwipo-si, Jeju-do ; locationRemarks: collected by SCUBA-diving; verbatimCoordinates: 33°13'35.78"N, 126°34'07.27"E; Event: eventDate: 27 Mar 2019 GoogleMaps
Type status: Other material. Occurrence: individualCount: 1; occurrenceID: 6A0AE6BA-B86B-5D25-A78E-A730101EC7B8; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Geumgye-ri, Gogun-myeon, Jindo-gun, Jeollanam-do ; verbatimCoordinates: 34°25'21.32"N, 126°20'56.94"E; Event: eventDate: 14 Dec 2016 GoogleMaps
Type status: Other material. Occurrence: individualCount: 1; occurrenceID: 5DF8577C-F423-5E58-AF2D-9FB504D98202; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Gujora Beach, Gujora-ri, Irun-myeon, Geoje-si, Gyeongsangnam-do ; verbatimCoordinates: 34°48'05.58"N, 128°41'28.40"E; Event: eventDate: 12 Jun 2018 GoogleMaps
Type status: Other material. Occurrence: individualCount: 1; occurrenceID: 1DB2075D-449C-5995-BCB5-B9A6A2EF4C92; Taxon: scientificName: Ischnochiton boninensis ; Location: country: Korea; locality: Haengnam Lighthouse, Dodong-ri, Ulleung-eup, Ulleung-gun, Gyeongsangbuk-do ; locationRemarks: collected by SCUBA-diving; verbatimCoordinates: 37°29'13.48"N, 130°55'00.18"E; Event: eventDate: 30 Oct 2018 GoogleMaps
Description
Body elongate-oval shaped, medium, less than 30 mm in length (Fig. 2 View Figure 2 A and C – E; in examined materials, body length [BL] 14.6–21.76 mm, body width [BW] 7.21–12.23 mm). Valves generally yellowish-green to dark green or wholly whitish or pinkish in colour, brown streaks or cream, yellow, bright pink blotches. Girdle rather narrower in width than valves, dark brown, often with yellow-brown blotches or transverse bands. Gills arrangement holobranchial and adanal on both sides with interspace (Fig. 2 View Figure 2 B).
Valves: Head valve semicircular in shape, tegmentum sculpted with about 50 fine radial riblets and a few strong growth lines; radial riblets bifurcate towards margin, but faint towards apex; anterior margin round; posterior margin widely V-shaped (Fig. 3 View Figure 3 A). Intermediate valves broadly rectangular in shape, not beaked (Fig. 3 View Figure 3 B and C), dorso-ventrally rounded or subcarinated, somewhat high in frontal view, side slope slightly convex (Fig. 3 View Figure 3 J; elevation ratio of 0.46 in the 4 th valve); anterior margin nearly straight to slightly convex, except for 2 nd valve (Fig. 3 View Figure 3 B; more convex than other intermediate valves, almost triangular); lateral margins somewhat round; posterior margin straight; tegmentum in central area (ca) with rows of densely small, elongate granules in quincunx or zig-zag patterns (Fig. 3 View Figure 3 I); lateral area (la) slightly raised, sculpted with 5–7 riblets, dividing to almost double towards margin, similar to head valve (Fig. 3 View Figure 3 B and C). Tail valve almost semicircular, as wide as head valve; anterior margin nearly straight (Fig. 3 View Figure 3 D); mucro (m) subcentral, not pointed; sculpture of antemucronal area (ama) similar to central area of intermediate valves; postmucronal area (pma) sculpted like head valve; postmucronal slope (pms) weakly concave (Fig. 3 View Figure 3 K). Articulamentum light blue, generally red violet in centre, very thin, reflecting colouration and patterns on tegmentum. Apophyses (ap; sutural laminae) short, delicate, triangular in 2 nd valve, but broad rectangular in the other valves; jugal lamina (jl) extremely short; jugal sinus (js) shallow, nearly straight; insertion plate (ip) short, teeth (t) relatively smooth with varying size; slit formula 10–13 / 1 / 9 – 10, slit rays (slr) distinct (Fig. 3 View Figure 3 E – H). Eaves (e) narrow, solid (Fig. 3 View Figure 3 J).
Girdle: Perinotum scales (ps: length [L] 91–110.8 μm, width [W] 120.3–190.7 μm) small, oval, flat, slightly bent, sculpted with 9–16 fine longitudinal ribs converging to distal tip, densely overlapped, parallel to outer margin (Fig. 7 View Figure 7 A and B); peripheral scales of perinotum (pps: L 25.8–56.4 μm, W 33.8–86.5 μm) much smaller than perinotum scales, elongate-oval, with 4–7 fine, flat longitudinal ribs (Fig. 7 View Figure 7 A – C); marginal spicules of three types: large one (lmsp: L 67.2–87.6 μm, W 16.9 μm) flat-ovate, narrower to tip, blunt, with weakly longitudinal ribs, middle one (mmsp: L 68.2–80.3 μm, W 7.3–10 μm) long, nearly straight, smooth, rod-shaped with blunt tip and small one (smsp: L 22.1–33.5 μm, W 9.9–11.5 μm) very short, stout with strong radial ribs at tip (Fig. 7 View Figure 7 A and C); hyponotum scales (hs: L 56.7 μm, W 14.7 μm) hyaline, smooth, oblong, overlapped, radiated to outline (Fig. 7 View Figure 7 D).
Radula: Radula teeth symmetrical (Fig. 8 View Figure 8 A). Central tooth (c) small, narrow, keeled from basal, blade broader than stalk, deeply concaved, bent forward; centro-lateral teeth (cl) slightly taller than central tooth, cuspids thickened, convex; head (h) of major lateral teeth (mlt) bicuspid, cuspids sharp, tapering towards tip, inner cuspid longer than outer one; petaloid process (pp; wing) below at head of major lateral tooth, large, rectangular, inner distal concave; major uncinus teeth (mu) long, spatula-shaped with rounded tip; marginal teeth (im, mm, om) flat, increasing in size from inner to outer teeth.
Distribution
China, Hong Kong, Japan, Vietnam and Korea.
Type locality
Japan: Sagami Misaki and Bonin Islands (Ogasawara).
Taxon discussion
This species is morphologically similar to I. comptus ( Gould, 1859) , but easily distinguished by the size and microstructure of its perinotum scales (Table 2 View Table 2 ). I. boninensis has small perinotum scales sculpted with conspicuous fine longitudinal ribs (Fig. 7 View Figure 7 A and B), while I. comptus displays relatively large, smooth, glossy scales (Fig. 7 View Figure 7 E and F). In contrast to the markedly high individual variations in tegmentum colour and pigmentation patterns, the mtDNA cox 1 sequences of this species showed moderate within-species variations, less than 1.8 % (Fig. 2 View Figure 2 A and C – E, Table 3 View Table 3 ), even amongst individuals sampled from different geographic regions (i. e. Japan and Korea).
Bergenhayn J. R. M 1933 Die Loricaten von Prof. Dr. Sixten Bocks Expedition nach Japan und den Bonin-Inseln, 1914 Kungl. Svenska Vetnskapsakademiens Handlingar 12 4 1 58
Dell'Angelo B., Hong J. S., Van Belle R. A. 1990 The Chiton fauna (Mollusca: Polyplacophora) of Korea: Part I: Suborder Lepidopleurina and Ischnochitonina Animal Systematics, Evolution and Diversity 6 29 55
Gould Augustus. A. 1859 Description of shells, collected by the North Pacific Exploring Expedition Proceedings of the Boston Society of Natural History 7 161 165 10.5962 / bhl. part. 4821
Higo S 1973 A catalogue of molluscan fauna of the Japanese Islands and the adjacent area Nagasaki Biological Society Nagasaki 397 Japanese
Higo S, Goto Y 1993 A systematic list of molluscan shells from the Japanese Is. and the adjacent area Elle Scientific Publications Osaka 693 Japanese
Higo S, Callomon P, Goto Y 1999 Catalogue and bibliography of the marine shell-bearing Mollusca of Japan Elle Scientific Publications Osaka 749
Kaas P, Van Belle R. A. 1980 Catalogue of living Chitons (Mollusca: Polyplacophora). E. J. Brill, Rotterdam 144 10.1163/9789004630628
Kaas P, Van Belle R. A. 1990 Monograph of living Chitons (Mollusca: Polyplacophora). Vol. 4. Suborder Ischnochitonina: Ischnochitonidae: Ischnochitoninae (continued), Additions to Vols 1, 2 and 3 Brill EJ Leiden 298 10.1163/9789004431706
Kaas P, Van Belle R. A. 1998 Catalogue of living chitons (Mollusca, Polyplacophora) 2 nd Revised Edition Dr. W. Backhuys Leiden 204
Kang YS 1971 Nomina Animalium Koreanorum (3) Hyang Moon Co. Seoul 180 Korean
Kira T 1982 Coloured illustrations of the shells of Japan. Vol. 1. 28 th printing Hoikusha Publishing Co. Osaka 240 Japanese
Lee J. S., Min D. K. 2002 A catalogue of molluscan fauna in Korea The Korean Journal of Malacology 18 93 217
Min D. K., Lee J. S., Koh D. B., Je J. G. 2004 Mollusks in Korea Hanguel Graphics Busan 566 Korean
Owada Masato 2016 A new cryptic species distinguished from Ischnochiton comptus (Gould, 1859) (Polyplacophora: Ischnochitonidae) in central Honshu, Japan Molluscan Research 36 4 255 263 10.1080/13235818.2016.1150772
Saito H 1995 The chiton fauna of Onagawa Bay Memoirs of the National Science Museum 28 99 112
Saito Hiroshi 2000 Polyplacophora Okutani T Marine mollusks in Japan Tokai University Press Tokyo 4-23
Saito Hiroshi 2017 Polyplacophora Okutani T Marine mollusks in Japan 2 nd edition Tokai University Press Tokyo 46-55, 728-738
Sirenko B. I., Zhang J 2019 Chitons (Mollusca: Polyplacophora) of Hainan Island and vicinity, South China Sea Zootaxa 4564 1 40 10.11646/zootaxa.4564.1.1
Slieker F. J. A. 2000 Chitons of the world: An illustrated synopsis of recent polyplacophora L’Informatore Piceno Ancona 154
Taki I. s. 1938 Report of the biological survey of Mutsu Bay 31. Studies of chitons of Mutsu Bay with general discussion on chitons of Japan The Science Reports of the Tôhoku Imperial University 12 323 423
Taki I. s. 1962 A list of the Polyplacophora from Japanese Islands and vicinity Venus 22 1 29 53
Taki I. w. 1964 On the chiton fauna of Japan (1). The status of Ischnochiton comptus and I. boninensis Venus 22 4 342 350
Taki I. w. 1964 Classification of the class Polyplacophora, with a list of Japanese chitons Venus 22 4 401 414
Van Belle R. A. 1982 Supplementary notes on Hong Kong chitons (Mollusca: Polyplacophora) Proceedings of the First International Marine Biology Workshop: The Marine Flora and Fauna of Hong Kong Hong Kong University Press Hong Kong 469-483
Yum S. S. 1988 Classification and distribution of the Korean Polyplacophora (Mollusca) Sung Kyun Kwan University Suwon 104 Korean
Figure 2. External view of Korean Ischnochiton species. A I. boninensis from Jeju, dorsal view; B I. boninensis from Jeju, ventral view; C I. boninensis from Ulleng (NIBRIV 0000863007), dorsal view; D I. boninensis from Jeju, dorsal view; E I. boninensis (= I. zebrinus) from Jeju (NIBRIV 0000863047), dorsal view; F I. comptus from Jeju (NIBRIV 0000863098), dorsal view; G I. comptus from Jeju (NIBRIV 0000863098), ventral view; H I. comptus from Jeju, dorsal view; I I. comptus from Jeju, dorsal view (NIBRIV 0000863020); J I. comptus from Uljin, dorsal view (NIBRIV 0000863048); K I. hakodadensis from Goseong (NIBRIV 0000863028), dorsal view; L I. hakodadensis from Goseong (NIBRIV 0000863028), ventral view; M I. hakodadensis from Goseong, dorsal view; N I. hayamii from Ulsan (NIBRIV 0000863103), dorsal view; O I. hayamii from Ulsan (NIBRIV 0000863103), ventral view. Scale bars: A – O = 5 mm. The NIBR voucher specimen numbers are provided in parentheses.
Figure 3. Valves of I. boninensis from Jeju (NIBR voucher specimen no. NIBRIV 0000863097). A head valve, dorsal view; B 2 nd valve, dorsal view; C 4 th valve, dorsal view; D tail valve, dorsal view; E head valve, ventral view; F 2 nd valve, ventral view; G 4 th valve, ventral view; H tail valve, ventral view; I 4 th valve, detail of tegmentum surface of central area using scanning electron microscope; J 4 th valve, frontal view; K tail valve, lateral view. Abbreviations: ama, antemucronal area; ap, apophyses; ca, central area; e, eave; ip, insertion plate; jl, jugal lamina; js, jugal sinus; la, lateral area; m, mucro; pma, postmucronal area; pms, postmucronal slope; sl, slit; slr, slit ray; t, tooth. Scale bars: A – H, J = 5 mm, I = 200 μm, K = 2 mm.
Figure 7. Microstructure of girdles in Ischnochiton species using scanning electron microscope. A – D I. boninensis; E – H I. comptus (NIBRIV 0000863098); I – L I. hakodadensis (NIBRIV 0000863046); M – P I. hayamii (NIBRIV 0000863103); A perinotum scales and marginal spicules of I. boninensis; B perinotum scales of I. boninensis; C marginal spicules of I. boninensis; D hyponotum scales of I. boninensis; E perinotum scales and marginal spicules of I. comptus; F perinotum scales of I. comptus; G marginal spicules of I. comptus; H hyponotum scales of I. comptus; I perinotum scales and marginal spicules of I. hakodadensis; J perinotum scales of I. hakodadensis; K marginal spicules of I. hakodadensis; L hyponotum scales of I. hakodadensis; M perinotum scales and marginal spicules of I. hayamii; N perinotum scales of I. hayamii; O marginal spicules of I. hayamii; P hyponotum scales of I. hayamii. Abbreviations: hs, hyponotum scale; lmsp, large marginal spicule; mmsp, middle marginal spicule; pps, peripheral perinotum scale; ps, perinotum scale; smsp, small marginal spicule. Scale bars: A – P = 50 μm. The NIBR voucher specimen numbers are provided in parentheses.
Figure 8. Microstructure of radula of Ischnochiton species using scanning electron microscope. A I. boninensis (NIBRIV 0000863095); B I. comptus (NIBRIV 0000863098); C I. hakodadensis; D I. hayamii (NIBRIV 0000863103). Abbreviations: c, central tooth; cl, centro-lateral tooth; h, head of major lateral tooth; im, inner marginal tooth; isl, inner small lateral tooth; mlt, major lateral tooth; mm, middle marginal tooth; mu, major uncinus tooth, om; outer marginal tooth; osl, outer small lateral tooth; pp, petaloid process. Scale bars: A – D = 100 μm. The NIBR voucher specimen numbers are provided in parentheses.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Genus |
Ischnochiton boninensis Bergenhayn, 1933
| Park, Jina, Kim, Yukyung, Putri, Eggy Triana & Park, Joong-Ki 2024 |
Ischnochiton (Simplischnochiton) boninensis
| Dell'Angelo B. & Hong J. S. & Van Belle R. A. 1990: 36 |
| Van Belle R. A. 1982: 470 |
Ischnochiton (Ischnochiton) boninensis
| Min D. K. & Lee J. S. & Koh D. B. & Je J. G. 2004: 70 |
| Lee J. S. & Min D. K. 2002: 94 |
| Higo S & Callomon P & Goto Y 1999: 27 |
| Kaas P & Van Belle R. A. 1990: 184 |
| Yum S. S. 1988: 20 |
| Higo S 1973: 6 |
| Taki I. s. 1962: 43 |
Ischnochiton (Ischnochiton) zebrinus
| Higo S & Callomon P & Goto Y 1999: 27 |
| Higo S & Goto Y 1993: 3 |
| Higo S 1973: 6 |
| Taki I. s. 1962: 43 |
| Taki (1964 b |
Ischnochiton boninensis
| Sirenko B. I. & Zhang J 2019: 6 |
| Saito Hiroshi 2017: 732 |
| Owada Masato 2016: 5 |
| Saito Hiroshi 2000: 12 |
| Slieker F. J. A. 2000: 98 |
| Kaas P & Van Belle R. A. 1998: 33 |
| Saito H 1995: 105 |
| Kira T 1982: 183 |
| Kaas P & Van Belle R. A. 1980: 18 |
| Kang YS 1971: 52 |
| Taki I. s. 1938: 369 |
| Bergenhayn J. R. M 1933: 10 |
Ischnochiton zebrinus
| Taki I. s. 1938: 375 |
| Bergenhayn J. R. M 1933: 13 |
| Taki (1964 a |
Ischnochiton (Ischnochiton) comptus (Gould)
| Higo S & Goto Y 1993: 3 |
| Higo S 1973: 6 |
| Ischnochiton (Ischnochiton) comptus (Gould) forma isaoi: Taki (1964 a ): 348, text-figs. 2, 4, 6; Taki (1964 b ): 408; Higo (1973) : 6 ; Higo and Goto (1993) : 3 . |
| Taki (1964 b |