Bryothinusa gangjinensis 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 : 195

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-AC2A-FFA2-4F99-FE6614F5FA98
treatment provided by	Carolina
scientific name	Bryothinusa gangjinensis Ahn & Jeon, 2004
status

Treatment

Bryothinusa gangjinensis Ahn & Jeon, 2004 View in CoL

( Figs 1Q; 1Q View Fig ; 19 View Fig ; 21F View Fig ; 22 View Fig )

(Japanese name: Kanjin-nagisa-hanekakushi)

Bryothinusa gangjinensis Ahn & Jeon, 2004: 29 View in CoL View Cited Treatment (original description;

type locality: Korea: Jeonnam); Aඌ*üൾ (2004): 591 (in annotatedca-

talogue of world species);Aඌൺඇඈ & Kඈ*°ංආൺ (2010): 297 (new record

from Japan: Tanega-shima); F*©ൺඇκ & A*üඇ (2011): 26 (in checklist);

Sർ*ü*“අκൾ & Sආൾඍൺඇൺ (2015): 676 (in catalogue of Palearctic species);

A*üඇ et al. (2017): 307 (in checklist of the Staphylinidae in Korea);

Lංඎ et al. (2020): 589 (in key of Japanese species), 592 (in checklist).

Type material. Not examined.

Material examined. JAPAN: HඈඇඌΗǕ: 2 JJ 17 unsexed spec., Mouth of Minato-gawa, Minato, Futtsu-shi, Chiba-ken, 27.v.2013, H. Ono; 4 JJ 1 ♀, 24 unsexed spec., same locality, 24.viii.2009 H. Ono; 2 JJ 2 ♀♀, 7 unsexed spec., Koajiro-wan, Koajiro, Misaki-machi, Miura-shi, Kanagawa-ken, 23.v.2013, H. Ono; 1 J 2 ♀♀, 67 unsexed spec., Miya-gawa, Iso-chô, Ise-shi, Mie-ken, 8.vi.2008, K. Akita; 2 ♀♀, 6 unsexed spec., Hannan 2-ku, Kishiwada-shi, Ôsaka-fu, 11.vi.2010, Y. Kawakami; 1 ♀, 5 unsexed spec., same locality, 7.x.2010, Y.Kawakami; 1 ♀, Arida-gawa, Miyazaki-chô, Arida-shi, Wakayama-ken, 28.v.2002, Y. Kawakami. SΗංκඈκඎ: 1 ♀, 1 unsexed spec., Kabe-gawa, Kamoshô, Sanuki-shi, Kagawa-ken, 13.iv.2008, H. Fujimoto; 1 ♀, 2 unsexed spec., Kôtô-gawa, Gôtô-chô, Takamatsu-shi, Kagawa-ken, 12.iv.2008, H. Fujimoto; 1 J 3 unsexed spec., Kamobe-gawa, Kamoshô, Sanuki -shi, Kagawa-ken, 12.iv.2008, H. Fujimoto; 1 J, Aya-gawa, Ejiri-chô, Sakaide-shi, Kagawa-ken, 12.iv.2008, H. Fujimoto; 2 unsexed spec., Nishihabu-machi, Matsuyama-shi, Ehime-ken, 19.iv.2009, H. Suenaga. KඒǕඌΗǕ: 1J, Iki-no-matsubara, Nishi-ku, Fukuoka-shi, Fukuoka-ken, 1.vii.2018, Y. Hisasue; 1 J 1 ♀, 13 unsexed spec., Chichibu-ga-ura, Shimabara, Nagasaki-ken, 10.v.2001, T. Watanabe; 1 ♀, 3 unsexed spec., Kawashima, Nobeoka-shi, Miyazaki-ken, 24.vii.2006, J. Nakajima; 1 ♀, 4 unsexed spec., Nagayoshi-kawa, Fukiage-chô, Hioki-shi, Kagoshima-ken, 9.xii.2007, K. Nakamura; 1 ♀, 6 unsexed spec., Manose-gawa, Masukawa, Kaseda, Minamisatsuma-shi, Kagoshima-ken, 20.iv.2008, M. Maruyama; 1 J 2♀♀, 11 unsexed spec., Aiboshi-gawa, Aiboshi, Minamisatsuma-shi, Kagoshima-ken, 20.iv.2008, M. Maruyama. Nൺඇඌൾං-ඌΗඈඍත: 3 JJ 6 unsexed spec., Ou-jima, Nago-shi, Okinawa-ken, 30.iv.2006, M. Moriguchi; 2 unsexed spec., Awase-Higata, Okinawa-shi, Okinawa-ken, 30.iv.2006, M. Moriguchi; 11 unsexed spec., Makiya, Nago-shi, Okinawa-jima, Okinawa-ken, 4.vii.2010, M. Moriguchi. Deposited at KUM but some will be distributed to NMPC and BMNH.

Redescription. Body ( Fig. 1Q View Fig ) small, about 1.9–2.4 mm in length, covered with minute setae. Abdomen almost black, darker than head and pronotum; elytra darker than pronotum, bicoloured but not clearly, base darker than apex; antenna and legs yellowish brown.

Head evenly rounded, more or less produced anteriorly, wider than long, shorter than elytra; eyes ( Fig. 2Q View Fig ) large, setae present between about 32–34 facets, slightly longer than 2/3 of head length; antennal length slightly longer than distance from anterior margin of head to posterior margin of pronotum; segment I 1.5 times longer than II, almost 2.8 times longer than III, and longer than XI; antennal segments V–X almost as long as wide.

Mouthparts ( Figs 19A–E View Fig ) with distribution of labral setae as in Figure 19A View Fig ; mandibles ( Fig. 19B View Fig ) elongate triangle, asymmetrical, right with densely median tooth, left mandible without tooth, blunt at apex; maxilla with apical margin of lacinia ( Fig. 19C View Fig ) at right angle; at tip with two spines not clearly; 7 setae on inner margin of lacinia; labial palpus ( Fig. 19D View Fig ) with most setae located basally; mentum ( Fig. 19E View Fig ) with antero-lateral angles prolonged into spinose processes; anterior margin deeply truncate; small “v seta” far away from apical setae.

Pronotum shorter than elytra, wider than head.

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

Male abdominal sternite VIII ( Fig. 19F View Fig ) with posterior margin slightly serrate. Median lobe of aedeagus and dorsal view as in Figures 19H, I View Fig ; paramere ( Fig. 19J View Fig ) with apical lobe elongate.

Female abdominal sternite VIII ( Fig. 19G View Fig ) slightly sunken at median posterior margin but wider and smoother than in male. Spermatheca ( Fig. 19K View Fig ) large, about 1.5 times coiled near base and larger than 0.25 mm.

Measurements. BL 1.90–2.40, FBL 0.90–1.20, HL 0.29– 0.30, HW 0.36–0.45, PL 0.31–0.45, PW 0.37–0.49, EL 0.36–0.55, EW 0.43–0.56, HTL 0.28–0.43, AL 0.60–0.75, AS-I 0.11–0.14, AS-II 0.06–0.11, AS-III 0.04–0.05.

Differential diagnosis. In general appearance, the species closely resembles B. nigra sp. nov. and B. nakanei but is easily distinguished from B. nigra sp. nov. in the shape and size of the spermatheca and is different from B. nakanei in having the posterior margin of the tergite X rounded medially.

Distribution. Japan (Honshû: Chiba, Kanagawa, Mie, Ôsaka, Wakayama; Shikoku: Kagawa, Ehime; Kyûshû: Fukuoka, Nagasaki, Miyazaki, Kagoshima; Nansei-shotô: Tanega-shima, Okinawa: Ou-jima, Okinawa-jima); Korea (Jeonnam).

Remarks. This species is mainly found west of Kantô District and Okinawa Island. A distribution map of examined specimens of this species in Japan is illustrated in Figure 22 View Fig .