Rotundicephala koheii Tasaku, Ono & Maruyama, 2023

Tasaku, Yuto, Ono, Hiroki & Maruyama, Munetoshi, 2023, Review of the intertidal rove beetle tribe Liparocephalini Fenyes (Coleoptera, Staphylinidae, Aleocharinae) from Japan, Zootaxa 5383 (3), pp. 251-296 : 274

publication ID	https://doi.org/ 10.11646/zootaxa.5383.3.1
publication LSID	lsid:zoobank.org:pub:20988E42-C14D-4878-A716-8CEAB5E5EF92
DOI	https://doi.org/10.5281/zenodo.10361649
persistent identifier	https://treatment.plazi.org/id/03FE87D6-4250-FFE6-82AA-38164CFEF837
treatment provided by	Plazi
scientific name	Rotundicephala koheii Tasaku, Ono & Maruyama
status	sp. nov.

Treatment

Rotundicephala koheii Tasaku, Ono & Maruyama , sp. n.

[Japanese name: Sawada-umi-hanekakushi]

( Figs. 1C View FIGURE 1 ; 2G View FIGURE 2 ; 14D View FIGURE 14 ; 15E, F & I View FIGURE 15 ; 16 View FIGURE 16 ; 25A & B View FIGURE 25 )

Type material. Holotype. Male, “Kanaya, Futtsu-shi, / Chiba-ken / 9. IV. 2007 / Hiroki ONO leg.” ( Fig. 14D View FIGURE 14 ) ( KUM) . Paratypes. Japan: Honshû: Chiba-ken: 1 male, 1 female, 23 unsexed, same data as holotype, 9. IV. 2007, H. Ono ( KUM) ; 3 unsexed, Tateyama-shi, Sunosaki, Sunosaki-kaigan , 15. VI. 2007, H. Ono ( KUM) ; 1 unsexed, ditto, 15. IV. 2008, H. Ono ( KUM) ; 1 unsexed, ditto, 12. II. 2009, H. Ono ( KUM) ; 2 unsexed, Shirahamamachi, Nemoto , 1. IV. 2005, H. Ono (cHO) ; 1 unsexed, ditto, 26. III. 2007, H. Ono (cHO); 1 unsexed, ditto, 18. IV. 2008, H. Ono (cHO) ; Tôkyô-to: 1 male, Izu-ôshima, Okada, Noda-hama, 15. VII. 2022, Y. Tasaku (cYT) ; Kanagawa-ken: 1 male, 23 unsexed, Manazuru-machi, Manazuru-misaki, 15. IV. 2003, M. Maruyama ( KUM) ; 5 unsexed, Yokosuka-shi , Wada-naga-hama (Nahama), 24. III. 2007, I. Kawashima ( KUM) ; 1 unsexed, ditto, 1. IV. 2007, I. Kawashima ( KUM) ; 1 male, 5 unsexed, ditto, 20. IV. 2007, M. Asano ( KUM) ; 1 unsexed (abdomen lost), Manazuru Pen. Banbaura-kaigan , 5. V. 2002, S. Arai ( KUM) ; 1 male, Yokosuka-shi, Nagai, Arasaki-kôen, 24. IX. 2021, K. Chiyoda (cYT); Shizuoka-ken: 1 unsexed, Shimoda-shi, Taraimisaki , 21. IV. 2003, M. Moriguchi ( KUM) ; 2 unsexed, Shimoda-shi, Tsumeki-zaki , 21. VI. 2003, M. Maruyama ( KUM) .

Diagnosis. This species similar to R. pacifica comb. n. and previously confused (e.g., Sawada, 1971;Ahn, 1996) (we call them as the R. pacifica species-complex) but, can be distinguished by the combination of the following characteristics: head and pronotum slightly convex ( Fig. 14D View FIGURE 14 ); segments IV–IX of antennae as long as wide ( Fig. 15I View FIGURE 15 ). Also, this species can be easily distinguished from R. koreana comb. n. by the short antennae not reaching elytra.

Description. Body small, robust, shining ( Fig. 14D View FIGURE 14 ). Ground color reddish blown, abdominal segments VI–VII usually almost black, legs and month parts slightly paler.

Head slightly convex, almost circular, as long as wide (MHL/MHW = 0.95) ( Fig. 1C View FIGURE 1 ); eyes small; antennae almost as long as head and pronotum combined, segments IV–X as long as wide, segment XI oval and longer than X ( Fig. 15I View FIGURE 15 ). Labrum transverse, anterior margin rounded, with about 20 setae; epipharynx with 6 lateral setae ( Fig. 16A View FIGURE 16 ). Mandibles almost symmetric, right median tooth larger than left one ( Fig. 16E View FIGURE 16 ). Mentum almost trapeziform, anterior margin deeply emarginated with about 15 setae ( Fig. 16B View FIGURE 16 ). Pronotum convex, as long as wide. Tarsal formula 3-3-4. Abdomen oblong oval.

Male: apical lobe of median lobe bent almost at right angle ( Fig. 15E View FIGURE 15 ).

Female: spermatheca short, coiled one time at base ( Fig. 15F View FIGURE 15 ).

Measurements. (N = 20): BL, 1.87–2.63 mm; FBL, 0.82–1.01 mm; HW, 0.34–0.42 mm; PL, 0.37–0.43 mm; PW, 0.34–0.40 mm; EW, 0.34–0.42 mm.

Etymology. This species is named after Dr. Kohei Sawada, who contributed greatly to the elucidation of the Japanese coastal Staphylinidae fauna.

Habitat. This species is found from the crevices of rock and around the holdfast of seeweeds (e.g., Monostroma nitidum Wittrock ) on the intertidal zones ( Fig. 25B View FIGURE 25 ).

Distribution. Japan: central Honshû ( Fig. 25A View FIGURE 25 ).