Leiodes shigehisai, 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 : 143-147

34. Leiodes shigehisai sp. nov.

Japanese name:Ainu-ô-tamakinokomushi ( Figs. 98–100 )

Type locality. Japan, Hokkaido, Mts. Daisetsu, Mikura-zawa.

Type material. JAPAN: HOKKAIDO: HOLOTYPE: ♂, Mts. Daisetsu, Mikura-zawa , 7.–15.viii.1999, S. Hori leg. ( PT) ( MNHAH) . PARATYPES: 3♀♀, same data as holotype ( FUFJ) ; 1♂, Mts. Daisetsu, Mt. Kurodake , 8.ix.1981, N.Yadusa leg. ; 1♀, 21.viii.1981, 1♀, 21.viii.1981, 1♂, 30.vii.1987, 1♀, 11.viii.1987, same data as the former except for the date ( FUFJ) ; 1♀, Mts. Hidaka, Mt. Poroshiri , 23.vii.1988, N.Yasuda leg. ( FUFJ) ; 1 ♀, Mt.Yôtei , 29.vii.1989, N. Yasuda leg. ( FUFJ) ; 1 ♂, 1 ♀, Rishiri Is., Mt. Rishiridake , 17.–31.vii.2001, S. Hori & M. Maruyama leg. ( PT) ( FUFJ) .

Examined specimens of related species. Leiodes rugosa Stephens, 1829 . 2 ♂♂, 2 ♀♀, United Kingdom, Bedfordshire, 8.x.1994, I. Ashby leg. ( FUFJ).

Diagnosis. Body 3.1–3.6 mm long, ca. 1.8× as long as wide. Dorsum almost unicolor or bicolored. Head and pronotum brown, dark brown or blackish brown. Elytra brown or dark brown, often with blackish brown stripe near elytral suture. Each elytron with nine distinct rows of punctures, subhumeral row reduced. Mesoventrite with a very shallow excavation between median carina and transverse carina. Median carina of mesoventrite low. Mesotibiae without distinct sexual dimorphism. Metatibiae almost straight in both sexes. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 3.3 mm; head 0.45 mm in length and 0.90 mm in width; pronotum 0.98 mm in length and 1.6 mm in width; elytra 2.2 mm in length and 2.0 mm in width.

Coloration. Dorsum relatively strongly shining, usually bicolored ( Figs. 98D, 98E ), rarely unicolor ( Fig. 98C ); head, pronotum and scutellum brown, dark brown or blackish brown; elytra almost unicolor ( Figs. 98C, 98D ) or bicolored ( Fig. 98E ), brown or dark brown, often with blackish brown stripes near elytral suture ( Fig. 98E ); antennomeres 1–6 and 8 brown; remaining antennomeres a little darker; legs light brown with all brown coxae; mesoventrite, metaventrite, and abdominal ventrites brown.

Body 3.1–3.6 mm in length, ca. 1.8× as long as wide.

Head ca. twice as wide as long, ca. 0.48× as long as and 0.58× as wide as pronotum, distinctly punctate ( Fig. 98A ), usually bearing some large punctures ( Fig. 98A ); antennomeres 1–4 each longer than wide; antennomeres 5 and 11 each about as long as wide; remaining antennomeres each wider than long; antennomere 11 oval ( Fig. 98F ); relative lengths of antennomeres 2 to 11 – 2.9: 4.3: 2.3: 2.3: 1.9: 3.1: 1.0: 3.3: 3.3: 5.4.

Pronotum ca. 1.6× as wide as long, ca. 0.44× as long as and 0.83× as wide as pronotum, widest at base, simply and very feebly curved at posterior margin, distinctly punctate as head ( Fig. 98A ).

Scutellum minutely or strongly punctate.

Elytra ca. 1.1× as long as wide in dorsal view, widest ca. at basal 2/5 ( Fig. 98A ), transversely strigose, almost impunctate except for small number of punctures between rows of punctures ( Fig. 98G ); each elytron with nine rows of punctures, row 9 invisible in dorsal view, subhumeral row as long as 1/4 of elytra in length ( Fig. 98B ); sutural stria fine, reaching from apex to ca. apical 3/5 of the elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, with one very shallow excavation between median carina and transverse carina ( Fig. 98H ); median carina of mesoventrite low ( Fig. 98H ); metaventrite sparsely and finely pubescent, weakly microreticulate except for almost smooth middle portion bearing minute but distinct punctures (setal sockets).

Legs showing sexual dimorphism on protarsi and metatarsi; protibiae gradually and feebly widening from base towards apex ( Figs. 99E, 99F ); metafemora slender, feebly expanded at about midlength of posterior margins ( Figs. 99C, 99D ), with small dorsal projection posteroapically ( Figs. 99G, 99H ); metatibiae almost straight ( Figs. 99C, 99D ).

Male. Tarsomeres 2–4 of protarsi clearly expanded ( Fig. 99A ); tarsomeres 2–4 of mesotarsi a little expanded; abdominal sternite 8 moderately curved ( Fig. 100D ); aedeagus slender ( Figs. 100A, 100B ); median lobe bluntly, apically pointed in dorsal view ( Fig. 100A ), distinctly curved and apically pointed in lateral view ( Fig. 100B ); each paramere fringed at apex, bearing three apical setae, and clearly thickening from basal third towards apex in lateral view ( Fig. 100B ); inner sac as shown in Fig. 100C .

Female. Protarsi and mesotarsi slender ( Fig. 99B ); abdominal sternite 8 with a spiculum ventrale at central point of anterior margin ( Fig. 100E ); coxites and stylus as shown in Fig. 100F .

Differential diagnosis. Leiodes shigehisai sp. nov. is similar to L. yoshitakei sp. nov. in the usually bicolored dorsal coloration, but can be distinguished from it by having each elytron with nine distinct rows of punctures ( Fig. 98A ). In contrast, L. yoshitakei sp. nov. has the elytra densely and strongly punctate between striae, therefore the elytra superficially appear not to bear rows of punctures ( Fig. 24A ). Leiodes shigehisai sp. nov. also resembles L. rugosa Stephens, 1829 occurring in the Russian Far East by having transversely strigose elytra, but can be separated from it by having the parameres feebly expanded at the lateral margins in the dorsal view ( Fig. 100A ). In contrast, L. rugosa has the parameres relatively strongly expanded at midlength.

Etymology. The species is dedicated to Mr. Shigehisa Hori who kindly gave me many valuable specimens of Leiodes used in this study.

Distribution. Japan: Hokkaido.

Figures

Fig. 98. Leiodes shigehisai sp. nov. A – body, dorsal view; B – ditto, lateral view; C, D, and E – dorsal color; F – antenna; G – elytral punctures; H – mesoventrite, lateral view. Scale I: 1 mm for A and B; II: 0.5 mm for F; III: 0.2 mm for H.

Fig. 99. Leiodes shigehisai sp. nov. A – male fore leg, ventral view; B – female fore leg, ventral view; C – male hind leg, ventral view; D – female hind leg, ventral view; E – male protibia, dorsal view; F – female protibia, dorsal view; G – male metafemur, dorsal view; H – female metafemur, dorsal view. Scale I: 0.5 mm for A and B; II: 1 mm for C and D; III: 0.2 mm for E and F; IV: 0.2 mm for G and H.

Fig. 100. Leiodes shigehisai sp. nov. A – aedeagus, dorsal view; B – ditto, lateral view; C – inner sac, dorsal view; D – male abdominal sternite 8; E – female abdominal sternite 8; F – coxite and stylus. Scale I: 0.5 mm for A and B; II: 0.1 mm for C; III: 0.2 mm for D and E, and 0.1 mm for F.

Fig. 24. Leiodes yoshitakei sp. nov. A – body, dorsal view; B – ditto, lateral view; C – dorsal color; D – antenna; E – elytral punctures; F – mesoventrite, lateral view; G – male metaventrite; H – female metaventrite. Scale I: 1 mm for A and B; II: 0.5 mm for D; III: 0.5 mm for F; IV: 1 mm for G and H.