Diaulota orientalis Tasaku, Ono & Maruyama 2023, sp. n.
Creators: name: Tasaku, Yuto
name: Ono, Hiroki
name: Maruyama, Munetoshi
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Diaulota
Diaulota orientalis

description: Diaulota orientalis Tasaku, Ono & Maruyama, sp. n.
[Japanese name: Higashi-shiributo-umi-hanekakushi]
(Figs. 12 & 24)
Type material. Holotype. Male, “ NIPPON: Kanagawa-ken, / Jôgashima, 16 VI 2003, / Maruyama M. / Dzâ川県 µヶ島(潮®帯) ” (Fig. 12A) (KUM). Paratypes. Japan: Honshû: Chiba-ken: 2 males, 5 females, Tateyama-shi, Okinoshima, 31. III. 2021, H. Ono (KUM); 2 males, 2 females, Tateyama-shi, Ito, 15. IV. 2008, H. Ono (KUM). Tôkyô-to: 1 male, Izu-ôshima, Okada, Noda-hama, 15. VII. 2022, Y. Tasaku (cYT); 2 males, 1 female, ditto, 17. V. 2022, H. Ono (cHO); 1 male, ditto, 18. V. 2022, H. Ono (cHO). Kanagawa-ken: 9 males, 13 females, Yokosuka-shi, Wada-nagahama (Nahama), 5. IV. 2007, I. Kawashima (KUM, OMNH, HIWA, cYT); 7 males, 9 females, ditto, 5. IV. 2007, M.Asano (KUM); 4 males, 4 females, Miura-shi, Misaki-machi, Koajiro, Aburatsubo, 29. V. 2018, H. Ono (cHO); 5 males, 11 females, same data as holotype, M. Maruyama (KUM, OMNH, cYT). Shizuoka-ken: 1 male, 1 female, Shimoda-shi, Tarai-misaki, 21. IV. 2003, M. Moriguchi (KUM).
Diagnosis. This new species is very similar to D. uenoi and D. submarina but, can be distinguished by the combination of following characteristics: apex of median lobe truncate in ventral view; apical sclerite rounded in lateral view (Fig. 12E), narrow toward apical margin in ventral view (Fig. 12F); suspensonia spoon-shaped and broad in apical half (Fig. 12F); spermatheca twice curved (Fig. 12G).
Description. Body robust, flattened. Ground color reddish brown, abdominal segment VI black, mouth parts yellow (Fig. 12A & B). Head quadrate, broader than pronotum in males, as broad as pronotum in females; eyes relatively small; antennae shorter than head and pronotum combined; segment I longest; segment II as long as XI; segment III shorter than II, about 1.5 times longer than IV; segments IV–VIII as long as wide; segments IX and X slightly wider than long; segment XI about 1.5 times longer than wide. Labrum semicircular, with about 20 setae. Mandibles almost symmetric, with a small tooth. Maxillary palpi 4 segmented; segment I very short, as long as IV; segment II quadrate, 2 times longer than I; segment III oval, slightly longer than II; segment IV thin. Labium: prementum without medial seta; ligula unilobed, short; labial palpi 3 segmented, segment II as thin as I, shorter than twice length of I; segment III thin, shorter than I (Fig. 12C). Mentum almost trapezoidal (Fig. 12D), emarginated at apical margin, with 6 setae. Pronotum flattened, trapezoidal. Elytra shorter than wide. Hind wings absent. Abdomen oval. Tarsal formula 4-4-5.
Male; tergite VIII with apical margin truncate; sternite VIII with apical margin slightly prolonged posteriorly; apical lobe of median lobe short, slightly pointed in lateral view (Fig. 12E); internal structure of median lobe with apical sclerites rounded at apex (Fig. 12E); suspensonia spoon-shaped, broad in apical half in ventral view (Fig. 12F); apical lobe of paramere slender.
Female; tergite VIII apical margin truncate; sternite VIII apical margin rounded; spermatheca short, apical part circular, twice curved around base (Fig. 12G).
Measurements. Male (N = 7): BL, 2.55–2.80 mm; FBL, 1.18–1.31 mm; HW, 0.60–0.67 mm; PL, 0.47–0.54 mm; PW, 0.51–0.56 mm; EW, 0.51–0.56 mm; HW/PW, 1.13–1.21. Female (N = 7): BL, 2.29–2.75 mm; FBL, 1.11– 1.21. mm; HW, 0.45–0.48 mm; PL, 0.44–0.48 mm; PW, 0.46–0.48 mm; EW, 0.45–0.47 mm; HW/PW, 0.94–1.03.
Etymology. The Latin “ orientalis ” means eastern in referring to its eastern distribution of the Diaulota uenoi species-complex in Japan.
Habitat. This species is found from the crevices of rocks and occasionally inside of the dead barnacles (Tetraclita japonica (Pilsbry)) on the intertidal zones. They usually occur lower than where R. koheii sp. n. are found, its habitat is exposed to strong waves.
Distribution. Japan: central Honshû (Pacific Ocean side) (Fig. 24).
description: Published as part of Tasaku, Yuto, Ono, Hiroki & Maruyama, Munetoshi, 2023, Review of the intertidal rove beetle tribe Liparocephalini Fenyes (Coleoptera, Staphylinidae, Aleocharinae) from Japan, pp. 251-296 in Zootaxa 5383 (3) on pages 268-269, DOI: 10.11646/zootaxa.5383.3.1, http://zenodo.org/record/10361564