Eubadura onoi, Tasaku & Maruyama, 2022

Tasaku, Yuto & Maruyama, Munetoshi, 2022, Taxonomy of the intertidal athetine genus Eubadura stat. nov. (Coleoptera: Staphylinidae: Aleocharinae) from Japan, with descriptions of two new species, Acta Entomologica Musei Nationalis Pragae 62 (1), pp. 137-144 : 141-143

Eubadura onoi sp. nov.

[Japanese name: Nisekebuka-umihime-hanekakushi]

( Figs 1E, I ; 3 ; 5 )

Type material. Hඈඅඈඍඒඉൾ: ♂, JAPAN: HඈඇඌHṺ: Chiba-ken, Kisarazu- -shi, Kuzuma, mouth of Obitsu-gawa riv., 13 III 2007, H. Ono( KUM).

Pൺඋൺඍඒඉൾඌ: 7 exs, same data as holotype ( KUM, NMPC); 1 ex., same data as holotype, but 2 III 2007 ( KUM); 2 exs, same data as holotype, but 12 III 2009 ( KUM); 7 exs, Chiba-ken, Tateyama-shi, Sunosaki-kaigan, 22 IV 2009, H. Ono ( KUM); 3 exs, Chiba-ken, Minamibôsô-shi, Shirahama-machi, Nemoto, 26 III 2007, H. Ono ( KUM).

Description. Head, pronotum and elytra reddish yellow; abdomen almost black and reddish yellow; antenna, mouthparts and legs paler. Head ( Fig. 1E ) wider than long (head width/head length ratio ca. 1.2). Pronotum slightly transverse, about 1.2 times as wide as long, widest around anterior 1/3, narrowed posteriorly; postero-lateral corners rounded; surface finely punctured, densely covered with setae, with 7 macrosetae along lateral margin. Scutellum with integument smooth and sparsely covered with setae. Elytra ( Fig. 1E ) 1.3 times as wide as pronotum; surface finely punctured, densely covered with setae, with 3 small macrosetae laterally. Hind wings reduced, as long as elytra. Abdomen oblong, tergites III–VII almost subparallel, surface smooth; tergites II–VII densely covered with setae. Antennae ( Fig. 1E ) almost as long as head and pronotum combined; antennomere I long; antennomere II shorter than I; antennomere III slightly shorter than II; antennomeres IV–X moniliform, each almost as long as wide; antennomere XI long, almost twice as long as X.

Male. Male tergite VIII ( Fig. 3A ) densely covered with setae, with 4 pairs of macrosetae. Male sternite VIII ( Fig. 3B ) rounded on posterior margin, with 7 pairs of macrosetae. Median lobe of aedeagus as in Figs 3F–G ; in lateral view ( Fig. 3G ) apical lobe much narrowed subapically, sinuate abparamerally and rounded at apex. Paramere ( Fig. 3H ) with apical lobe of paramerite dilated apically.

Female. Female tergite VIII ( Fig. 3C ) densely covered with setae, with 4 pairs of macrosetae. Female sternite VIII ( Fig. 3D ) rounded on posterior margin, with 6 pairs of macrosetae. Spermatheca ( Fig. 3E ) with basal part of stem twice curved around base; capsule dilated apically, about 1/3 as long as stem, densely covered with wrinkles on internal side of apical 2/5.

Measurements (mm). Body length ca. 2.20–2.80; fore body length ca. 1.1–1.3; head width 0.41–0.44; pronotal length 0.38–0.44; pronotal width 0.44–0.48.

Differential diagnosis. This species is similar to E. akiensis in body shape but distinguished from it by hind wings reduced and the spermathecal shape. This species is also similar to E. yasukoae but distinguished from it by the spermathecal shape.

Etymology. Named after the collector of the holotype, Mr. Hiroki Ono for his contribution to the knowledge of the coastal rove beetle fauna in Japan.

Biology. Adult beetles were found under stones on mudflats.

Distribution. Japan: central Honshû.

Figures

Fig. 1. Habitus of Eubadura spp. A–C, G – E. akiensis (Sawada, 1990); D, H – E. yasukoae (Maruyama, Klimaszewski & Gusarov, 2008); E, I – E. onoi sp. nov.; F, J – E. hokkaidensis sp. nov. Scale bars: 1.00 mm

Fig. 3. Eubadura onoi sp. nov.A – male tergite VIII; B – male sternite VIII; C – female tergite VIII; D – female sternite VIII; E – spermatheca; F – median lobe, ventral view; G – median lobe, lateral view; H – paramere. Scale bars: 0. 1 mm.

Fig. 5. Known localities of Eubadura spp.Black circle – E. akiensis (Sawada, 1990); black triangle – E. yasukoae (Maruyama, Klimaszewski & Gusarov, 2008); black square – E. onoi sp. nov.; black star – E. hokkaidensis sp. nov.