Bryothinusa fulvipennis, Liu & Ono & Maruyama, 2021

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 : 182-184

publication ID	https://doi.org/ 10.37520/aemnp.2021.009
publication LSID	lsid:zoobank.org:pub:27EA8466-6B29-40F4-8236-DD49061C523B
persistent identifier	https://treatment.plazi.org/id/03CB023B-AC19-FF97-4E58-F88015D5FD98
treatment provided by	Carolina
scientific name	Bryothinusa fulvipennis
status	sp. nov.

Treatment

Bryothinusa fulvipennis View in CoL sp. nov.

( Figs 1J View Fig ; 2J View Fig ; 12 View Fig ; 21B View Fig ; 22 View Fig )

(Japanese name: Usucha-nagisa-hanekakushi)

Type material. Hඈඅඈඍඒඉൾ: J, JAPAN: HඈඇඌΗǕ: Mouth of Obitsugawa, Kuzuma, Kisarazu-shi, Chiba-ken, 2.iii.2007, H. Ono ( KUM).

Pൺ*©ൺඍඒඉൾඌ: HඈඇඌΗǕ: 1 ♀, same data as holotype ( KUM); 1 unsexed spec., same locality as holotype, 19.ii.2007, H. Ono ( KUM); 1 J 2 unsexed spec., Mouth of Obitsu-gawa, Kuroto, Kisarazu-shi, Chiba-ken, 19.ii.2007, H. Ono ( KUM); 1 unsexed spec., same locality, 12.iii.2009, H. Ono ( KUM); 1 ♀, 3 unsexed spec., same locality, 16.iii.2009, H. Ono ( KUM); 1 J, same locality, 4.i.2010, H. Ono ( KUM); 1 unsexed spec., same locality, 12.i.2011, H. Ono ( KUM); 1 unsexed spec., same locality, 14.i.2011, H. Ono ( KUM); 1 unsexed spec., Kushidagawa, Matsuzaka-shi, Mie-ken, 28.iv.2002, Y. Kawakami ( KUM); 10 unsexed spec., Himeshima, Yodo-gawa, Nishiyodo-gawa-ku, Ôsaka-fu, 12.iv.2002, Y. Kawakami ( KUM, MNPC, BMNH); 3 unsexed spec., Hanakawa Yodo-gawa, Nishiyodo-gawa-ku, Ôsaka-fu, 25.iv.2002, Y. Kawakami ( KUM); 4 unsexed spec., same locality, 28.iii.2002, Y. Kawakami ( KUM); 1 unsexed spec., Kinburo, Kitagi-shima, Kasaoka-shi, Okayama-ken, 11.x.2008, O. Yamaji ( KUM); 3 unsexed spec., Kurahashi-jima (Umikoshi), Kurahashi-chô, Kure-shi, Hiroshima-ken, 1.ii.2009, K. Nakano ( KUM). SΗංκඈκඎ: 11 unsexed spec., Kaigan-ji, Nishishirakata, Tadotsu-chô, Kagawa-ken, 31.iii.2008, H. Fujimoto ( KUM); 1 unsexed spec., Ôyatomi-machi, Sakaide-shi, Kagawa-ken, 29.iii.2008, H. Fujimoto ( KUM); 1 unsexed spec., Kôtô-gawa, Gôtô -chô, Takamatsu-shi, Kagawa-ken, 12.iv.2008, H. Fujimoto ( KUM).

Description. Body ( Fig. 1J View Fig ) small, about 1.6–2.0 mm in length, covered with minute setae. Abdomen almost black and darker than head and pronotum; elytra lighter than pronotum; antenna and legs yellowish brown.

Head evenly rounded, more or less produced anteriorly, wider than long, shorter than pronotum and elytra; eyes ( Fig. 2J View Fig ) large, setae present between about 22–24 facets, slightly longer than tempora length; antenna yellowish brown, almost equals to total length of head and pronotum; segment I 1.7 times longer than II, almost 4 times longer than III, and longer than XI; antennal segments IV–X almost as long as wide.

Mouthparts ( Figs 12A–E View Fig ) with distribution of labral setae as in Figure 12A View Fig , with large and thick spiniform seta antero-laterally; mandibles ( Fig. 12B View Fig ) elongate triangle, asymmetrical, right with median tooth; median tooth shorter than 1/4 of mandibles; left without tooth, blunt at apex; maxilla with apical margin of lacinia ( Fig. 12C View Fig ) second spine very small, not obvious; 3 setae on inner margin of lacinia; labial palpus ( Fig. 12D View Fig ) with most setae located basally; mentum ( Fig. 12E View Fig ) with antero-lateral angles prolonged into spinose processes; anterior margin deeply truncate; small “v seta” far away from apical setae.

Pronotum almost as long as elytra, wider than head.

Elytra subquadrate but wider than long, almost as wide as pronotum; hind wings present but very small, apparently flightless.

Male abdominal sternite VIII ( Fig. 12F View Fig ) with posterior margin slightly serrate. Median lobe of aedeagus ( Fig. 12H View Fig ) and dorsal view as in Figure 12I View Fig ; paramere ( Fig. 12J View Fig ) elongate.

Female abdominal sternite VIII ( Fig. 12G View Fig ) slightly serrate alike male on posterior margin. Spermatheca ( Fig. 12K View Fig ) about 2 times coiled near base.

Measurements. BL 1.60–2.00, FBL 0.90–1.00, HL 0.28– 0.30, HW 0.36–0.43, PL 0.36–0.40, PW 0.40–0.45, EL 0.35–0.41, EW 0.36–0.45, HTL 0.23–0.33, AL 0.61–0.76, AS-I 0.13–0.14, AS-II 0.07–0.08, AS-III 0.03–0.04.

Differential diagnosis. In general appearance the species is very similar to B. hokkaidensis sp. nov. and B. itsuroi sp. nov., but easily distinguished from B. hokkaidensis sp. nov. by the paler body colour and the shape of the spermatheca, and from B. itsuroi sp. nov. by the number of facets and the shape of the spermatheca.

Etymology. The species epithet refers to the yellowish -brown elytra; adjective.

Distribution. Japan (Honshû: Chiba-ken, Mie-ken, Ôsaka-fu, Okayama-ken, Hiroshima-ken; Shikoku: Kagawa-ken).

Remarks. This species has been found mainly in coasts of bay and inland sea such as Tôkyô-wan, Ise-wan and Setonaikai. A distribution map of examined specimens of this species in Japan is illustrated in Figure 22 View Fig .