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Marine molluscs from the intertidal zone of Minami-Iwo-To Island
Tetsuro SASAKI1*, Tetsuya YAMADA2, Akitsugu MUKAI1,
Sora HORIKOSHI1, Yosuke AMEDA1 & Takumi SEKIGUCHI2
1. ̲ǈҸŻĞ˹ı˵Ë ǞΏŌϠ̩ɺĸͨΆɃӞ100-2101 ʪÊҀǞΏŌʦ̮ǮƽИ͋ӟ
Institute of Boninology, Nishimachi, Chichijima, Ogasawara, Tokyo 100-2101, Japan.
2. w]¥hm¨q KAIZINӞ100-2101 ʪÊҀǞΏŌʦ̮ǮƽƱʦӟ
Diving Service KAIZIN, Okumura, Chichijima, Ogasawara, Tokyo 100-2101, Japan.
* t-sasaki@ogasawara.or.jp (author for correspondence)ЙʆńͪӚǮ?̟җǿR 19 Ϳ?сӇXͫб)1ЦҎͿ?3 o]d]QCfmovv ? 2 Ϳ@ŢǮR?ěЦҎͿ84110 ȅģ?жʴ9ˡі)7̟җǿсӇ͜<Ʃ;ƣĸ@ЛRU;41e¨¤¨ ѓáı̱āŇͿӉ˯єͦǿ̣ǩĚǮǞΏŌзǮ
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Fukuda, H. (1993) Marine Gastropoda (Mollusca) of the Ogasawara (Bonin) Islands Part   1: Archaeogastropoda and Neotaenioglossa. Ogasawara Research, 19, 85p.
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− 343 −Yamazaki D, Miura O, Ikeda M, Kijima A, Tu DV, Sasaki T, Chiba S (2017) Genetic diversification ofintertidal gastropoda in an archipelago: the effects of islands, oceanic currents, and ecology. Marine
Biology, 164: 184.
Ű͇Ƚ©ѽ Ӟ2017ӟ 1-7. ҟͅсӇ. ӞǞΏŌϠ̩ɺĸͨΆɃκӟ̣ǩĚǮ̾˳жʴƘūʗ, 78-82, ʪÊҀǞΏŌɯȉ, ʪÊ.

− 344 −

SUMMARY

Marine molluscs from the intertidal zone of Minami-Iwo-To Island
Tetsuro SASAKI1*, Tetsuya YAMADA2, Akitsugu MUKAI1,
Sora HORIKOSHI1, Yosuke AMEDA1 & Takumi SEKIGUCHI2
1. Institute of Boninology, Nishimachi, Chichijima, Ogasawara, Tokyo 100-2101, Japan.
2. Diving Service KAIZIN, Okumura, Chichijima, Ogasawara, Tokyo 100-2101, Japan.
* t-sasaki@ogasawara.or.jp (author for correspondence)
Nineteen species of molluscs were found in the intertidal zone of Minami Iwo-To Island. Two
species, Melampus nuxeastaneus and Microtralia acteocinoides, were recorded for the first time fromthis island. Compared to the survey conducted in 2007, there was no significant change in the intertidal
molluscan fauna.
Key words
Dominant species, Kazan Island Group, Mollusca, Ogasawara Islands, Splash zone.

− 345 −

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жʴƌ̥ӮAPӯ[c|zw]qӢBCӯ̀ǭ¨qe¥ӢTGӯ͔ɭŗ.
Table 1. Taxonomic list of marine molluscs in this survey.
Ӡ, Molluscs possibly endemic to the Ogasawara and adjacent islands;'A7GG0F:;F)7B?AM4E;9?;G, New to Minami-Iwo-To Island.
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Ќ 2. ѲŎ?ͫбЦҎ9?ˡі
Table 2. Comparison with past survey record on Minami- Iwo-To Island.
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Ќ 3. ̟җǿ<#TϞюӇ?ŁǈҊжʴίʯӠӯǞΏŌзǮQCǞΏŌŬѝ̀ƓƇʚ?řϘȱTϞюӇ. Ќ³?ɷ÷@ 2 Ë×30 ėҗ1S?͓ЛóáɷӮӡӢ110 óáӯ10<Ӣ11100 óáӯ100<Ӣ101 óáÓ­. жʴƌ̥ӮAPӯ[c|zw]qӢBCӯ̀ǭ¨qe¥ӢTGӯ͔ɭŗӢUGӯ^h]q˻,TAӯ̙·˼ӢMSӯªã˻ӢKYӯ̢̉ǶӢSHӯД˦̀ǭӯSK1ӢƜ˼ĹӢSK2ӢƜ˼ńӢBTӯ
v̀ǭ. ̮ǮĚǮ?жʴ}¨v@àʟRӞ2014ӟXɰƣ.
Table 3. The results of semi-quantitative survey of gastropod in intertidal, supratidal zone on the MinamiIwo-To Island and Chichijima Island Group.
Ӡ, Molluscs possibly endemic to the Ogasawara and adjacent islands. Number of individuals counted
per hour: ӡ, 110; 10<, 11100, 100<, more than 100. Survey sites: AP, Akatetsu-Paradise; BC,
Kaigan Base Camp; TG, Tohanguhi, UG, Uguisuhama; TA, Takinoura; MS, Mansakuhama; KY,
Kiyosegawa; SH, Seihyokaigan; SK1, Sakaiura-Kita; SK2, Sakaiura-Minami; BT, Butakaigan. Survey
data of Chichijima Island Group modified Sasaki et al. (2014).

− 348 −

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AP
TG

BC

Ɔ 1. ̟җǿсӇжʴƌ̥AP, [c|zw]qģӯBCӢ̀ǭ¨qe¥ģӯTG, ͔ɭŗģ
Figure 1. Map showing localities in this survey.
AP, Akatetsu-Paradise; BC, Kaigan Base Camp; TG, Tohanguchi− 350 −

A

B

C

D

E

F

Ɔ 2. жʴ͂ƜQCāŇͿ?̈́ȳ͂Ɯ
A: [c|zw]qŬѝ?̟җǿ. C12)ɷ?g£veeĶķ)7
1; B: [c|zw]qŬѝ?̟җǿ®Ѿ<7āŇ+T¡mn`; C: ͔ɭŗģ?̟
җǿʒП; D: ̀ǭ BC ģ?̟җǿQCӉ˯ǿ; E: ̟җǿ?ǫͬ­<Ʀͅ+Tbdm¤[bd]; F; ̟җǿ?ǫͬ­<Ʀͅ+To¤dm.
Figure 2. Pictures of survey sites and habitats of dominant species.
A: Intertidal zone of AP, Supplanaxis nigrer dominates; B: Intertidal zone of AP, Turbo(Marmarostoma) setosus dominates; C: Intertidal zone of TG; D: Intertidal and supratidal zone of BC;
E: A habitat of Nipponacmaea boninensis; F: A habitat of Cellana enneagona.

− 351 −

A

B

C

D

E

F

G

H

I

Ɔ 3. ͫб'U1µ;̟җǿ̟­ǿсӇ.
A: o¤dm(CIBML-P20180009); B: bdm¤[bd](CIBML-P20180006); C: bbg£{i(CIBML-P20180008); D: g£vee(CIBML-P20180012); E: k^wcve
(CIBML-P20180007); F: bdm¤ve(CIBML-P20180018); G: v xhm(CIBMLP20180015); H:o]d](CIBML-P20180013); I: fmovv

Microtaralia alba

(CIBML-P20180016).
Figure 3. Notable marine molluscs occurred in this survey.
A: Cellana enneagona (CIBML-P20180009); B: Nipponacmaea boninensis (CIBML-P20180006); C:
Monodonta perplexa boninensis (CIBML-P20180008); D: Supplanaxis nigrer (CIBML-P20180012);
E: Littoraria (Littoraria) pintado (CIBML-P20180007); F: Echinolittorina cinerea (CIBMLP20180018); G: Paludinella cf. corpulenta (CIBML-P20180015); H: Melampus nuxeastaneus(CIBML-P20180013); I: Microtaralia alba (CIBML-P20180016).

− 352 −