Leiodes toyoshimai, Hoshina, 2012

Hoshina, Hideto, 2012, Review of the tribes Sogdini and Leiodini from Japan and North Chishima Islands. Part II. Genera Hydnobius and Leiodes (Coleoptera: Leiodidae), Acta Entomologica Musei Nationalis Pragae (suppl. 1) 52, pp. 1-168 : 57-61

publication ID	https://doi.org/ 10.5281/zenodo.4272467
DOI	https://doi.org/10.5281/zenodo.4339396
persistent identifier	https://treatment.plazi.org/id/03E98224-323C-0729-76E0-41A8FE5EA0AF
treatment provided by	Felipe
scientific name	Leiodes toyoshimai
status	sp. nov.

Treatment

10. Leiodes toyoshimai View in CoL sp. nov.

Japanese name: Tsumebuto-ô-tamakinokomushi ( Figs. 33–35 View Fig View Fig View Fig , 112 View Fig )

Type locality. Japan, Honshu, Gifu Pref., Shirakawa Village, Ô–shirakawa.

Type material. JAPAN: HONSHU: HOLOTYPE, ♂, Gifu Pref., Shirakawa Village , Ô–shirakawa, 31.vii.2004, K. Toyoshima leg. ( FIT) ( MNHAH). PARATYPES, 1♂, 5♀♀, same data as holotype ( FUFJ) ; 2♀♀, same data as holotype except for the date, 24.vii.2004 ( FUFJ) ; 1 ♂, 3 ♀♀, same data as holotype except for the date, 8.viii.2004 ( FUFJ) ; 3 ♀♀, same data as holotype except for the date, 22.viii.2004 ( FUFJ) ; 2 ♂♂, 3 ♀♀, Saitama Pref., Ohtaki Village, Nakatsukawa-keikoku , Oku-Chichibu-rindô (alt. 1300 m), 30.vii.–7.viii.2004, K. Arai & S. Arai leg. ( FIT) ( FUFJ) ; 1 ♀, Saitama Pref., Naguri Village, Mt. Arimayama (alt. 1200 m), 17.–24.vii.2004, K. Arai and S. Arai leg. ( FIT) ( FUFJ) ; 1 ♂, Kanagawa Pref., Hakone Town, Ôwakudani , 17.-27.viii.2007, T. Watanabe leg. ( FUFJ) ; 1 ♂, Ishikawa Pref., Mts. Hakusan, Sarukabe-entei , 2.–22.viii.2002, H. Hoshina leg. ( FIT) ( FUFJ) ; 3 ♂♂, 1 ♀, Tokushima Pref., Higashi-iyayama Village, Nagoro, Otome-dani Valley , 5.–12.viii.2006, K. Tanaka leg. ( FUFJ) .

Diagnosis. Body 2.9–3.5 mm long, ca. 1.8× as long as wide. Dorsum brown. Each elytron with nine distinct rows of punctures and subhumeral row as long as ca. 1/4 of elytral length. Mesoventrite with one distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Mesotibiae showing distinct sexual dimorphism. Male metafemora a little curved posteriad at posterior margins. Tarsomeres 2 and 3 of male protarsi and mesotarsi extremely expanded. Male metatibiae feebly curved inwards. Female abdominal sternite 8 with two distinct projections on anterior margin.

Description. Measurements of holotype: Body length 3.2 mm; head 0.47 mm in length and 0.87 mm in width; pronotum 1.0 mm in length and 1.6 mm in width; elytra 1.9 mm in length and 1.8 mm in width.

Coloration. Dorsum shining and almost unicolor, brown; antennomere 1 light brown; antennomeres 2–6 and 8 brown; antennomeres 7, 9, 10, and basal 2/3 of antennomere 11 blackish dark brown; apical 1/3 of antennomere 11 light brown; legs brownish; tarsi often light brown; mesoventrite and metaventrite brown; abdominal ventrites slightly paler than metaventrite.

Body 2.9–3.5 mm in length, ca. 1.8× as long as wide.

Head ca. 1.8× as wide as long, ca. 0.48× as long as and 0.54× as wide as pronotum, densely and minutely punctate ( Fig. 33A View Fig ), usually bearing some large punctures ( Fig. 33A View Fig ); antennomeres 1–3 each longer than wide; antennomeres 4 and 11 about as long as wide; remaining antennomeres each wider than long; antennomere 11 robust ( Fig. 33C View Fig ); relative lengths of antennomeres 2 to 11 – 3.5: 3.7: 1.5: 1.5: 1.3: 2.7: 1.0: 3.8: 3.6: 3.7.

Pronotum ca. 1.6× as wide as long, ca. 0.51× as long as and 0.91× as wide as elytra, widest near base, simply and very feebly curved at posterior margin, distinctly and minutely punctate, punctation similar to that on head ( Fig. 33A View Fig ).

Scutellum minutely punctate.

Elytra ca. 1.1× as long as wide in dorsal view, widest ca. at basal 1/4 ( Fig. 33A View Fig ), not transversely strigose; each elytron bearing nine rows of punctures with small number of large punctures and dense very fine punctures between rows ( Fig. 33E View Fig ); row 9 invisible in dorsal view, subhumeral row as long as ca. 1/4 of elytral length ( Fig. 33B View Fig ); elytral rows composed of coarse or minute punctures, larger than those of pronotum ( Fig. 33A View Fig ); sutural stria fine, arising from apex to ca. apical half of the elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, and with one distinct excavation between median carina and transverse carina ( Fig. 33F View Fig ); median carina of mesoventrite low ( Fig. 33F View Fig ); metaventrite showing indistinct sexual dimorphism, sparsely pubescent, and distinctly microreticulate except for almost smooth middle portion.

Legs showing distinct sexual dimorphism on protarsi, protibiae, mesotarsi, metafemora, and metatibiae; mesotibiae showing indistinct sexual dimorphism; metafemur robust, with small dorsal posteroapical projection ( Figs. 34I, 34J View Fig ).

Male. Metaventrite with relatively robust pubescence around middle portion ( Fig. 33G View Fig ); protibiae gradually and strongly widening from base towards apex at internal margins ( Fig. 34G View Fig ); tarsomeres 2–4 of protarsi and mesotarsi expanded and tarsomeres 2 and 3 extremely broadened ( Figs. 34A, 34C View Fig ); mesotibiae relatively strongly broadening from base towards apex ( Fig. 34C View Fig ); metafemora a little curved posteriad at posterior margins ( Fig. 34E View Fig ); metatibiae feebly curved inwards ( Fig. 34E View Fig ); abdominal sternite 8 strongly curved ( Fig. 35D View Fig ); aedeagus relatively robust ( Figs. 35A, 35B View Fig ); median lobe triangular at apex in dorsal view ( Fig. 35A View Fig ), strongly curved and pointed apically in lateral view ( Fig. 35B View Fig ); each paramere bearing two apical setae and transparent very small lobe at apex ( Fig. 35A View Fig ); inner sac with some large sclerites ( Figs. 35A, 35C View Fig ).

Female. Metaventrite with relatively thin pubescence ( Fig. 33H View Fig ); protibiae gradually and very feebly widening from base towards apex at internal margins ( Fig. 34H View Fig ); protarsi and mesotarsi slender ( Figs. 34B, 34D View Fig ); mesotibiae relatively weakly broadening from base towards apex ( Fig. 34D View Fig ); metafemora almost straight at posterior margins ( Fig. 34F View Fig ); metatibiae almost straight ( Fig. 34F View Fig ); abdominal sternite 8 with two projections at anterior margin ( Fig. 35E View Fig ); coxites and stylus as shown in Fig. 35F View Fig .

Differential diagnosis. Leiodes toyoshimai sp. nov. is similar to L. koreana in elytral appearance, but can be distinguished from the latter by having a relatively small body (2.9–3.5 mm), mesoventrite with a distinct excavation between the median carina and transverse carina ( Fig. 33F View Fig ), and male protarsi and mesotarsi with extremely expanded tarsomeres 2 and 3 ( Figs. 34A, 34C View Fig ). In contrast, L. koreana has a relatively large body (3.2–4.4 mm), mesoventrite with a shallow excavation ( Fig. 27E View Fig ) and tarsomeres 2 and 3 of male protarsi and mesotarsi moderately expanded ( Fig. 28A View Fig ). Leiodes toyoshimai sp. nov. is also similar to L. dubia (Kugelann, 1794) inhabiting Europe and the Russian Far East by having a robust body, but can be separated from it by having a relatively robust aedeagus ( Fig. 35A View Fig ). In contrast, L. dubia has a slender aedeagus.