Aleochara (Tinotus) takashii, Yamamoto, Shuhei & Maruyama, Munetoshi, 2016

Yamamoto, Shuhei & Maruyama, Munetoshi, 2016, Revision of the subgenus Tinotus Sharp, stat. n., of the parasitoid rove-beetle genus Aleochara Gravenhorst (Coleoptera, Staphylinidae, Aleocharinae) from Japan, Taiwan, and the Russian Far East, ZooKeys 559, pp. 81-106 : 90-94

Taxon classification Animalia Coleoptera Staphylinidae

Aleochara (Tinotus) takashii sp. n. Figs 3, 27-34

Type locality.

Japan, Honshû: Takahachiyama, Fujinomiya City, Shizuoka Prefecture.

Type material.

Holotype: male, "Takahachiyama / Fujinomiya-shi / Shizuoka, JAPAN / 17-24. VIII. 2010 / T. Watanabe leg. [printed] // Flight / Intercept. / Trap [printed] // Aleocharini / Gen. / sp. / det. T. Watanabe 2013 [yellow square paper card, printed]" (KUM).

Paratypes: 1 male, "Teppogino-atama / Nishitanzawa / Kanagawa, Japan / 5-12. VII. 2007 / T. Watanabe leg. // Flight / Intercept. / Trap" (KUM); 1 male, "Teppogino-atama / Nishitanzawa / Kanagawa, Japan / 5-12. VII. 2007 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2007" (KUM); 1 male, "Teppogino-atama / Nishitanzawa / Kanagawa, Japan / 5-12. VII. 2007 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2008" (KUM); 1 male, "Idenzawa / Nishitanzawa / Kanagawa, Japan / 31. V - 6. VI. 2006 / T. Watanabe leg. // Aleochara / sp. / det. T. Watanabe 2007" (KUM); 2 spec., "Yanagisawa-toge / Enzan-shi / Yamanashi, Japan / 2-9. VIII. 2006 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2007" (KUM); 1 female, "Yanagisawa-toge / Enzan-shi / Yamanashi, Japan / 9-15. VIII. 2006 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2006" (PCTW); 2 females, "Karumizu-rindo / Narusawa-mura / Yamanashi, JAPAN / 30. VIII-14. IX. 2010 / T. Watanabe leg. // Aleochara / sp. / det. T. Watanabe 2012" (KUM); 1 female, "Karumizu-rindo / 1600 m, Narusawa / Yamanashi, JAPAN / 3-10. VIII. 2011 / T. Watanabe leg. // Flight / Intercept / Trap // Aleochara / sp. / det. T. Watanabe 2012" (KUM); 1 male, "Aokigahara, Fuji- / Kawaguchiko / Yamanashi, JAPAN 11-17. V. 2012 / T. Watanabe leg. // Flight / Intercept. / Trap / Aleochara / sp. / det. T. Watanabe 2013" (KUM); 1 male (head mounted on slide), 1 spec., "Fujisan 1-gome / Subashiri (1400 m) / Shizuoka, JAPAN / 20-26. V. 2011 / T. Watanabe leg. // Flight / Intercept. Trap // Aleochara / sp. / det. T. Watanabe 2012" (KUM); 1 male, 1 female, "Ohbuchi (alt. 950m) / Fuji-shi / Shizuoka, JAPAN / 13-18. V. 2010 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2012" (KUM); 1 spec., "Ohbuchi (alt. 950m) / Fuji-shi / Shizuoka, JAPAN / 16-22. VII. 2010 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2012" (KUM); 1 spec., "Ohbuchi (alt. 950m) / Fuji-shi / Shizuoka, JAPAN / 24. X. 2012 / T. Watanabe leg. // Aleocharinae " (KUM); 1 male, "Takahachiyama / Fujinomiya-shi / Shizuoka. JAPAN / 28. VIII. 2012 / T. Watanabe leg. // Aleocharinae " (KUM); 1 male, "Nishiusuzuka / Fujinomiya-shi / Shizuoka, JAPAN / 22-31. V. 2013 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2013" (PCTW); 1 male, "Nishiusuzuka / Fujinomiya-shi / Shizuoka, JAPAN / 8-16. VII. 2010 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2010" (PCTW); 1 male, 1 spec., "Nishiusuzuka / Fujinomiya-shi / Shizuoka, JAPAN / 16-22. VII. 2010 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2011" (KUM); 1 spec., "Nishiusuzuka / Fujinomiya-shi / Shizuoka, JAPAN / 17-24. VIII. 2010 / T. Watanabe leg. // Flight / Intercept. / Trap // Aleochara / sp. / det. T. Watanabe 2012" (KUM).

Diagnosis.

This species can be easily distinguished from the other members of the subgenus by a following combination of characters: body entirely reddish brown (Fig. 3); abdominal segments III-V (first three visible terga) deeply impressed laterobasally; both tergite and sternite VIII with weakly developed basal sutures (Figs 27-30); median lobe of aedeagus with long apical lobe, notched deeply and medially at apex in ventral view (Fig. 33); spermatheca with a curved spermathecal head, unequally serrated inner walls inside spermathecal head, and with approximately three coils at base (Fig. 34). Aleochara takashii is the most similar to the North American species, Aleochara (Tinotus) imbricata (Casey, 1894), comb. n., of which shares including the similar configuration of male genitalia. From Aleochara imbricata , it can be distinguished additionally by having much more developed sclerites inside the median lobe of the aedeagus and by overall shape of the spermatheca ( Klimaszewski et al. 2002: 289: Figs 13-16, 31-33).

Description.

Measurements (in mm, n = 23): BL = 3.156 (2.637-3.669); HL = 0.419 (0.361-0.483); HW = 0.488 (0.418-0.760); PL = 0.528 (0.421-0.605); PW = 0.756 (0.599-0.866); EW = 0.880 (0.693-1.019).

Body (Fig. 3): fusiform, compact, and robust; dorsal surface moderately glossy and pubescent, covered with small and inconspicuous micro-reticulation.

Color (Fig. 3): usually uniformly dark reddish brown to dark brown; elytra lighter; antennomeres I–IV lighter, but segments V to XI darker with numerous minute whitish setae; mouthparts and legs yellowish brown to dark reddish brown; apices of tergites III-V pale reddish brown transversely; pubescence yellowish brown to brown.

Head (Fig. 3): subquadrate, slightly transverse (HW/HL = 1.17, n = 23), widest just behind base of eyes; setae on vertex rather dense, directed anteriomedially. Eyes: small, occupying approximately one third of head length, very slightly protruding laterally.

Antennae (Fig. 3): short, moderately shorter than head and pronotum combined; relatively thick, setaceous, becoming gradually and moderately broaden apically in segments V to X, with segment V elongate and segments VI to X clearly transverse; segment XI symmetrical, obtusely pointed at apex; approximate relative length of segments from basal to apex: 23: 16: 17: 10: 9: 9: 9: 9: 9: 9: 22.

Pronotum (Fig. 3): strongly convex above dorsally, transverse (PW/PL = 1.43, n = 23), moderately longer than sutural length of elytra, widest around below of basal half, basal margin weakly rounded; pubescence in moderate length but thin, directed laterally and posterolaterally; micro-reticulation inconspicuous.

Elytra (Fig. 3): together, transverse, rather small, widest at middle; pubescence short, finely scattered densely, diverging posterolaterally in each elytron; dorsal surface moderately rough, shallowly impressed; posterolateral corner of each elytron moderately sinuate.

Abdomen (Fig. 3): first three visible tergites deeply impressed transversely at base; dorsal and ventral surface covered with setae rather sparsely.

Male. Tergite VIII (Fig. 27): basal suture not fully developed, suture partially disappeared laterally (Fig. 27: arrow 1); posterior margin very weakly serrate, insignificantly emarginate medially or truncate; dorsal surface covered with setae rather densely, with six macrosetae. Sternite VIII (Fig. 29): basal suture completely lost (Fig. 29: arrow 3); posterior margin rounded; ventral surface covered with short setae dense ly, with approximately eight macrosetae. Median lobe of aedeagus (Figs 31-33): narrowly elongate in lateral, and limuloid narrowly in parameral view; apical lobe slender and long, as long as basal capsule, moderately narrowing apically in lateral view, with deeply notched apex medially in parameral view (Fig. 33); without a protuberance at base of apical lobe; a pair of sclerites curved just above middle, long, approximately 2/3 length of apical lobe; flagellum developed, shorter than median lobe, without any coils at base.

Female. Tergite VIII (Fig. 28): basal suture not fully developed, suture partially disappeared laterally like male (see Fig. 27: arrow 1) or at most weakly developed (Fig. 28: arrow 2); posterior margin very weakly serrate or almost truncate; dorsal surface covered with setae densely, with six macrosetae. Sternite VIII (Fig. 30): basal suture completely lost like male (see Fig. 29: arrow 3); posterior margin rounded; ventral surface covered with setae densely, with approximately eight macrosetae. Spermatheca (Fig. 34): curved semi-circularly in lateral view; spermathecal head curved at middle; attachment of spermathecal duct inconspicuous; basal part of spermathecal stem moderate in size, clearly longer than spermathecal neck, with approximately three coils; each part of spermatheca entirely and very moderately sclerotized; inner wall of spermathecal head, coarsely striate irregularly.

Etymology.

The species name is dedicated to its collector, Mr. Takashi Watanabe (Kanagawa, Japan).

Distribution.

Only known from central Honshû, Japan (Kanagawa, Yamanashi, and Shizuoka Prefectures).

Bionomics.

Most specimens were caught with flight interception traps (FIT).

Host records.

No host record is available.

Remarks.

This new species is distinct among the species of Tinotus . In particular, reduced or non-developed basal sutures on tergite and sternite VIII of both sexes are notable character states (Figs 27-30). Furthermore, the apical lobe of the median lobe of male aedeagus, [i.e., deeply notched medially at apex in parameral view (Fig. 33)], is also a remarkable character state even among the subfamily. Since other morphological characters correspond fully to that of the subgenus Tinotus , we assign this species to Tinotus without hesitation.