Bryothinusa koreana Ahn & Jeon, 2004

Liu, Tian-tian, Ono, Hiroki & Maruyama, Munetoshi, 2021, Revision of the intertidal rove beetle genus Bryothinusa from Japan (Coleoptera: Staphylinidae: Aleocharinae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 61 (1), pp. 163-201 : 173

Bryothinusa koreana Ahn & Jeon, 2004

( Figs 1D ; 2D ; 6 ; 20H ; 21A ; 22 )

(Japanese name: Chôsen-nagisa-hanekakushi)

Bryothinusa koreana Ahn & Jeon, 2004: 31 (original description; type locality: Korea: Jeonnam);Aඌ*üൾ (2004): 592 (in annotated catalogue of world species); Jൾඈඇ &A*üඇ (2009): 367–373 (larval description); F*©ൺඇκ & A*üඇ (2011): 27 (in checklist); Pൺ*©κ et al. (2013):(163 in checklist from Korea); Sർ*ü*“අκൾ & Sආൾඍൺඇൺ (2015):676 (catalogueof Palearctic species);A*üඇ et al. (2017):307 (in checklist of the Staphylinidae in Korea); Lංඎ et al. (2020): 585–593 (new record from Japan; redescription), 589 (in key of Japanese species), 592 (in checklist).

Type material. Not examined.

Material examined. JAPAN: HඈඇඌΗǕ: 1 J 1♀, Kusumi-bana,Ôbatake, Ko-jima, Kurashiki-shi, Okayama-ken, 21.iii.2009, O. Yamaji; 3 JJ 2 ♀♀, Miya-jima, Hiroshima-ken, 23.iv.1997, K. Sawada & R. Sawada; 5 JJ 2 ♀♀, 6 unsexed spec., Tanoura, Naga-shima, Kaminoseki-chô, Yamaguchi-ken, 15.x.2005, Y. Nakase; 1 ♀, same locality, 1.v.2008, M. Moriguchi. SΗංκඈκඎ: 2 ♀♀, 7 unsexed spec., Koura-kaigan, Koiso, Higashi-kagawa-shi, Kagawa-ken, 21.iv.2013, T. Taki; 1 ♀, 2 unsexed spec., same locality, 29.iv.2014, T. Taki; 4 ♀♀, 6 unsexed spec., Kaburagoshi, Matsubara, Higashi-kagawa-shi, Kagawa-ken, 7.ix.2015, T. Taki. KඒǕඌΗǕ: 6 unsexed spec., Mouth of Sakurai-gawa, Shima-nogita, Itoshima-shi, Fukuoka-ken, 21.iv.2020, Y. Hisasue; 2 ♀♀, 4 unsexed spec., Kakise,Takashima, Nagasaki-shi, Nagasaki-ken, 4.viii.2020, Y. Hisasue. Deposited at KUM but some will be distributed to NMPC and BMNH.

Additional description. Number of facets is 17–19 as in Figure 2D . Antennal segment I 1.1 times longer than II, almost 2 times longer than III, and as long as XI. Mouthparts with median tooth longer than 1/4 of mandibles; 6 setae on inner margin of lacinia; male and female abdominal sternite VIII, spermatheca and aedeagus as in Figure 6 (edited from Lංඎ et al. (2020)). See also Lංඎ et al. (2020). Differential diagnosis. In general appearance, the species is closely similar to B. algarum , B. japonica , B. tsutsuii and B. yoshigoui sp. nov., but is easily distinguished from B. japonica by the apical part of the spermatheca without granule-like projections, and from B. tsutsuii by the median lobe of the aedeagus with granule-like projections while that of B. tsutsuii and B. algarum median lobe of aedeagus without granule-like projections, and differs from B. yoshigoui sp. nov. in the number of facets and body colour.

Distribution. Japan (Honshû: Okayama-ken, Hiroshimaken, Yamaguchi-ken; Shikoku: Kagawa-ken; Kyûshû: Fukuoka-ken, Nagasaki-ken); Korea (Jeonnam).

Remarks. Presumably this species occurs also in other areas, especially Japan Sea coast of western Japan and Seto Inland Sea coast of Japan. A distribution map of examined specimens of this species in Japan is illustrated in Fig. 22 .

Figures

Fig. 1. Habitus of Bryothinusa spp. A – B. algarum Sawada, 1971; B – B. minuta (Sawada, 1955); C – B. tsutsuii (Sawada, 1955); D – B. koreana Ahn & Jeon, 2004; E – B. yoshigoui sp. nov.; F – B. japonica Liu, Ono & Maruyama, 2020; G – B. sakishimana Sawada, 1991; H – B. constricta sp. nov.; I – B. hokkaidensis sp. nov.; J – B. fulvipennis sp. nov.; K – B. itsuroi sp. nov.; L – B. aikoae sp. nov.; M – B. okinawana sp. nov.; N – B. nigra sp. nov.; O – B. nakanei (Sawada, 1955); P – B. moriguchii sp. nov.; Q – B. gangjinensis Ahn & Jeon, 2004. Scale bars: 1.00 mm.

Fig. 2. Compound eyes of Bryothinusa spp.A – B. algarum Sawada, 1971; B – B. minuta (Sawada, 1955); C – B. tsutsuii (Sawada, 1955); D – B. koreana Ahn & Jeon, 2004; E – B. yoshigoui sp. nov.; F – B. japonica Liu, Ono & Maruyama, 2020; G – B. sakishimana Sawada, 1991; H – B. constricta sp. nov.; I – B. hokkaidensis sp. nov.; J – B. fulvipennis sp. nov.; K – B. itsuroi sp. nov.; L – B. aikoae sp. nov.; M – B. okinawana sp. nov.; N – B. nigra sp. nov.; O – B. nakanei (Sawada, 1955); P – B. moriguchii sp. nov.; Q – B. gangjinensis Ahn & Jeon, 2004. Scale bars: 0.05 mm.

Fig. 6. Bryothinusa koreana Ahn & Jeon, 2004. A – labrum; B – mandible, dorsal view; C – lacinia, dorsal view; D – labium; E – mentum; F – male sternite VIII; G – female sternite VIII; H – median lobe, ventral view; I – median lobe, lateral view; J – paramere; K – spermatheca. Scale bars: 0.1 mm. Modified from Lංඎ et al. (2020).

Fig. 20. Collection localities of Bryothinusa species in Japan:A – B. algarum Sawada, 1971 in Nemoto, Chiba; B – B. minuta (Sawada, 1955), B. nakanei (Sawada, 1955) and B. sakishimana Sawada, 1991 in Takara-jima (Ôgomori beach), Tokara-rettô; C – B. minuta in Nakano-shima (Yoriki), Tokara-rettô; D – B. minuta, B. nakanei and B. sakishimana in Iriomote-jima (mouth of Honera-gawa); E – B. tsutsuii (Sawada, 1955) in Nakano-shima (Amadomari), Tokara-rettô; F – B. nakanei and B. tsutsuii in Iriomote-jima (Haemida); G – B. tsutsuii in Iriomote-jima (mouth of Nakama-gawa); H – B. itsuroi sp. nov. and B. koreana Ahn & Jeon, 2004 in Kakise, Taka-shima, Nagasaki.

Fig. 21. Collection localities of Bryothinusa species in Japan: A – B. koreana Ahn & Jeon, 2004 and B. japonica Liu, Ono & Maruyama, 2020 in Shima-nogita, Fukuoka; B – B. aikoae sp. nov., B. fulvipennis sp. nov., B. japonica and B. nigra sp. nov. in Kuroto, Chiba; C – B. hokkaidensis sp. nov. in Shunkunitai, Hokkaidô; D – B. nigra sp. nov. and B. tsutsuii (Sawada, 1955) in Edateku-jima; E – B. nakanei (Sawada, 1955) in Nagura-anparu, Ishigaki-jima; F – B. gangjinensis Ahn & Jeon, 2004 in Iki-no-matsubara, Fukuoka; G – B. algarum Sawada, 1971, B. japonica and B. minuta (Sawada, 1955) in Sunosaki, Fukuoka.

Fig. 22. Map of examined specimens of Bryothinusa spp. from Japan: white inverted triangle – B. algarum Sawada, 1971; black inverted triangle – B. minuta (Sawada, 1955); white star – B. tsutsuii (Sawada, 1955); black star – B. koreana Ahn & Jeon, 2004; black square – B. yoshigoui sp. nov.; white triangle – B. japonica Liu, Ono & Maruyama, 2020; black diamond – B. sakishimana Sawada, 1991; white diamond – B. constricta sp. nov.; white square – B. hokkaidensis sp. nov.; black triangle – B. fulvipennis sp. nov.; double circle – B. itsuroi sp. nov.; arrow – B. aikoae sp. nov.; black hart – B. okinawana sp. nov.; circled dot – B. nigra sp. nov.; white circle – B. nakanei (Sawada, 1955); white hart – B. moriguchii sp. nov.; black circle – B. gangjinensis Ahn & Jeon, 2004.