Bryothinusa moriguchii, 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 : 192-195

publication ID	https://doi.org/ 10.37520/aemnp.2021.009
publication LSID	lsid:zoobank.org:pub:27EA8466-6B29-40F4-8236-DD49061C523B
DOI	https://doi.org/10.5281/zenodo.10532129
persistent identifier	https://treatment.plazi.org/id/03CB023B-AC17-FFA2-4CF2-FF46167EFEB8
treatment provided by	Carolina
scientific name	Bryothinusa moriguchii
status	sp. nov.

Treatment

Bryothinusa moriguchii View in CoL sp. nov.

( Figs 1P View Fig ; 2P View Fig ; 18 View Fig ; 22 View Fig )

(Japanese name: Moriguchi-nagisa-hanekakushi)

Type material. Hඈඅඈඍඒඉൾ: J, JAPAN: Nൺඇඌൾං-ඌΗඈඍත: Yagaji-jima, Nago-shi, Okinawa-ken, 21.iii.2005, M. Moriguchi ( KUM). Pൺ*©ൺඍඒඉൾඌ: 3 JJ 3 ♀♀, 4 unsexed spec., same data as holotype ( KUM, NMPC, BNMH); 2 ♀♀, 4 unsexed spec., Uehara, Iriomote-jima, 2.iv.2004, M. Moriguchi ( KUM).

Description. Body ( Fig. 1P View Fig ) small, about 1.9–2.2 mm in length, covered with minute setae. Basically, dark brown, elytra brown palest, head and pronotum similarly coloured, paler than abdomen; antenna, mouthparts and legs similarly coloured, lightly paler than head colour and paler toward apex.

Head oval, wider than long, almost as long as pronotum, shorter than elytra; eyes ( Fig. 2P View Fig ) small, reniform, longer than 2/3 of head length, with 32–34 facets; antennal length slightly longer than distance from anterior margin of head to posterior margin of pronotum; segment I as long as II, almost 2.5 times longer than III, and as long as XI; antennal segments I–III and XI longer than wide, antennal segments IV–X almost as long as wide.

Mouthparts ( Figs 18 View Fig A-E) with distribution of labral setae as in Figure 18A View Fig , with large and thick spiniform seta antero-laterally; mandibles ( Fig. 18B View Fig ) elongate triangle, asymmetrical, right with median tooth; median tooth shorter than 1/4 of mandibles; left mandible without tooth, blunt at apex; maxilla with apical margin of lacinia ( Fig. 18C View Fig ) with second spines very small and not obvious, at tip with two spines not closely interdigitating; 3 setae on inner margin of lacinia; labial palpus ( Fig. 18D View Fig ) with most setae located basally; mentum ( Fig. 18E View Fig ) with antero-lateral angles prolonged into spinose processes; anterior margin deeply truncate; small “v seta” of mentum lower than level of anterior margin.

Pronotum shorter than elytra, almost as wide as head.

Elytra subquadrate but wider than long, wider than pronotum; hind wings fully developed.

Male abdominal sternite VIII ( Fig. 18F View Fig ) with posterior margin slightly serrate. Medial posterior margin not protruded, sharp in form on tergite X of male ( Fig. 18H View Fig ). Median lobe of aedeagus ( Fig. 18J View Fig ) and dorsal view in Figure 18K View Fig ; paramere ( Fig. 18L View Fig ) elongate.

Female abdominal sternite VIII ( Fig. 18G View Fig ) with posterior margin slightly sunken but smoother than in male. Medial posterior margin protruded sharp in form on tergite X of female ( Fig. 18I View Fig ). Spermatheca ( Fig. 18M View Fig ) of complicated shape, about 2.5 times coiled near base.

Measurements. BL 1.90–2.20, FBL 1.00–1.10, HL 0.35– 0.40, HW 0.43–0.45, PL 0.38–0.40, PW 0.45–0.46, EL 0.45–0.48, EW 0.50–0.55, HTL 0.33–0.38, AL 0.75–0.85, AS-I 0.10–0.13, AS-II 0.10–0.13, AS-III 0.04–0.05.

Differential diagnosis. In general appearance the species is very similar to B. okinawana sp. nov., but easily distinguished from it by having large, thick spiniform seta at the antero-lateral part of the labrum, and the coil number of the spermathecal basal part and of the posterior margin of the tergite X being protruded.

Etymology. This new species is named after Mr. Mitsuru Moriguchi, the collector of the type series.

Distribution. Japan (Nansei-shotô: Okinawa-ken:Yagajijima, Iriomote-jima).

Remarks. This species may occur in other areas, especially the coastline of western Japan. A distribution map of examined specimens of this species in Japan is illustrated in Figure 22 View Fig .