Leiodes yoshitakei, 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 : 46-49

7. Leiodes yoshitakei sp. nov.

Japanese name: Yoshitake-ô-tamakinokomushi ( Figs. 24–26 , 111 )

Type locality. Japan, Hokkaido, Ebetsu City, Nopporo Forest Park

Type material. JAPAN: HOKKAIDO: HOLOTYPE, ♂, Ebetsu City, Nopporo Forest Park, 31.x.2001, S. Hori leg. ( FIT) ( MNHAH) . PARATYPES, 2 ♂♂, 2 ♀♀, same data as holotype ( FUFJ) ; 1 ♀, same data as holotype except for the date, 6.vi.2001 ( FUFJ) ; 1 ♂, same data as holotype except for the date, 24.x.2001 ( FUFJ) .

Diagnosis. Body 2.6–3.1 mm long, ca. 1.8× as long as wide. Dorsum bicolored. Head and pronotum dark brown. Elytra yellowish brown with black stripes, densely and strongly punctate between rows of punctures, transversely strigose. Mesoventrite without distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Male mesotibia protuberant at interoapical corner. Male metatibiae weakly curved. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 3.0 mm; head 0.45 mm in length and 0.77 mm in width; pronotum 0.74 mm in length and 1.3 mm in width; elytra 1.9 mm in length and 1.6 mm in width.

Coloration. Dorsum shining and bicolored ( Fig. 24C ); head usually dark brown, rarely brown, always with yellowish brown clypeus; pronotum usually dark brown, rarely brown; scutellum black; elytra yellowish brown with black stripes near elytral suture, elytral bases and lateral margins ( Fig. 24C ); antennomeres 1, 6, and 8 brown; antennomeres 7, 9, 10, and basal 3/5 of antennomere 11 black; apical 2/5 of antennomere 11 light brown; legs brownish; mesocoxae and metacoxae dark reddish brown; remaining parts of legs brown; mesoventrite and metaventrite dark reddish brown; abdominal ventrites brown.

Body 2.6–3.1 mm in length, ca. 1.8× as long as wide.

Head ca. 1.8× as wide as long, ca. 0.56× as long as and 0.57× as wide as pronotum, distinctly punctate ( Fig. 24A ), usually bearing some large punctures ( Fig. 24A ); antennomeres 1–4 each longer than wide; antennomere 11 about as long as wide; remaining antennomeres each wider than long; antennomere 11 robust ( Fig. 24D ); relative lengths of antennomeres 2 to 11: 2.8: 2.9: 1.7: 1.7: 1.2: 2.3: 1.0: 2.8: 3.0: 4.0.

Pronotum ca. 1.9×as wide as long, ca. 0.38× as long as and 0.86× as wide as elytra, widest at base, simply and very feebly curved at posterior margin, distinctly punctate, punctation similar to that on head ( Fig. 24A ).

Scutellum minutely punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal 2/5 ( Fig. 24A ), transversely strigose, densely, irregularly, and strongly punctate between rows of punctures, therefore superficially appearing not to bear rows of punctures ( Fig. 24A, 24B, 24E ); most punctures of elytra larger than those of head and pronotum ( Fig. 24A ); 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 without distinct excavation between median carina and transverse carina ( Fig. 24F ); median carina of mesoventrite low ( Fig. 24F ); metaventrite showing indistinct sexual dimorphism ( Figs. 24G, 24H ), sparsely and finely pubescent, strongly microreticulate except for almost smooth middle portion.

Legs showing distinct sexual dimorphism on protarsi, mesotibia, mesotarsi, and metatibia; protibiae feebly and gradually widening from base towards apex in dorsal view ( Figs. 25G, 25H ); metafemur slender ( Figs. 25E, 25F ), and with a small dorsal projection posteroapically ( Figs. 25I, 25J ).

Male. Pubescence of middle portion of metaventrite a little denser and thicker than in female ( Figs. 24G, 24H ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Figs. 25A, 25C ); mesotibia strongly protuberant and bearing a robust spine at interoapical corner ( Fig. 25C ); metatibiae weakly curved ( Fig. 25E ); abdominal sternite 8 strongly curved ( Fig. 26C ); aedeagus slender ( Figs. 26A, 26B ); median lobe gradually narrowed from apical 1/6 towards apex, and apically pointed in dorsal view ( Fig. 26A ), feebly curved and apically pointed in lateral view ( Fig. 26B ); each paramere transparent near apex, bearing two apical setae ( Fig. 26A ); inner sac as shown in Fig. 26A .

Female. Pubescence of middle portion of metaventrite relatively sparse and thin ( Fig. 14H ); protarsi and mesotarsi slender ( Figs. 25B, 25D ); mesotibia with slender spines at interoapical corner ( Fig. 25D ); metatibiae almost straight ( Fig. 25F ); abdominal sternite 8 with a spiculum ventrale at central point of anterior margin ( Fig. 26D ); coxites and stylus as shown in Fig. 26E .

Differential diagnosis. Leiodes yoshitakei sp. nov. is similar to L. circinipes ( Rye, 1873) by the transversely strigose elytra, but may be distinguished from the latter by having the body about 1.8 times as long as wide ( Fig. 24A ), head and pronotum being dark brown ( Fig. 24C ), metaventrite showing sexual dimorphism in pubescence of the median portion, and basal half of parameres relatively slender in lateral view ( Fig. 26B ). In contrast, L. circinipes has the body about 1.6 times as long as wide ( Fig. 16A ), the head and pronotum are brown ( Fig. 16C ), the metaventrite does not showing sexual dimorphism in pubescence, and the basal half of parameres is relatively thick in lateral view ( Fig. 18B ). Moreover, L. yoshitakei sp. nov. is also similar to L. rugosa Stephens, 1829 inhabiting Russian Far East by having striate elytra, but can be separated from it by parameres with two apical setae. In contrast, L. rugosa has parameres fringed with multiple setae at apex.

Etymology. This species is dedicated to Yoshitake Shima (1822–1874) who contributed to the reclamation of the Hokkaido island.

Distribution. Japan: Hokkaido.

Figures

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.

Fig. 25. Leiodes yoshitakei sp. nov. A – male fore leg, ventral view; B – female fore leg, ventral view; C – male middle leg, ventral view; D – female middle leg, ventral view; E – male hind leg, ventral view; F – female hind leg, ventral view; G – male protibia, dorsal view; H – female protibia, dorsal view; I – male metafemur, dorsal view; J – female metafemur, dorsal view. Scale I: 0.5 mm for A–D; II: 0.5 mm for E and F; III: 0.2 mm for G and H; IV: 0.2 mm for I and J.

Fig. 26. Leiodes yoshitakei sp. nov.A – aedeagus, dorsal view; B – ditto, lateral view; C – male abdominal sternite 8; D – female abdominal sternite 8; E – coxite and stylus. Scale I: 0.5 mm for A and B; II: 0.2 mm for C and D and 0.1 mm for E.

Fig. 111. Distribution of Leiodes circinipes species group: (●) L. yasudai sp. nov., (■) L. juzoi sp. nov., (▲) L. yoshitakei sp. nov., (*) L. circinipes (Rye, 1873); circle by broken line – Mts. Daisetsu; arrow – suggested migration pathway of L. circinipes group from the continent to Japan.

Fig. 14. Leiodes yoshidai 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: 0.5 mm for C and D; III: 0.2 mm for E and F; IV: 0.2 mm for G and H.

Fig. 16. Leiodes circinipes (Rye, 1873).A – body, dorsal view; B – ditto, lateral view; C – dorsal color; D – antenna; E – elytral punctures; F – mesoventrite, lateral view. Scale I: 1 mm for A and B; II: 0.5 mm for D; III: 0.5 mm for F.

Fig. 18. Leiodes circinipes (Rye, 1873). A – aedeagus, dorsal view; B – ditto, lateral view; C – male abdominal sternite 8; D – female abdominal sternite 8; E – coxite and stylus. Scale I: 0.5 mm for A and B; II: 0.2 mm for C and D and 0.1 mm for E.