Leiodes kandai, 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 : 27-30

2. Leiodes kandai sp. nov. Japanese name: Kanda-ô-tamakinokomushi ( Figs. 10–12 , 110 )

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

Type material. JAPAN: HONSHU: HOLOTYPE, ♂, Gifu Pref., Shirakawa Village ,Ô–shirakawa, 4.ix.2004, K.Toyoshima leg. ( MNHAH). PARATYPES: same data as holotype except for dates: 1 ♀, 3.vii.2004 ( FUFJ), 1 ♂, 1 ♀, 19.vii.2004 ( FUFJ), 1 ♀, 24.vii.2004 ( FUFJ), 1 ♂, 31.vii.2004 ( FUFJ), 2 ♂♂, 3 ♀♀, 22.viii.2004 ( FUFJ). All type specimens were collected by FIT.

Diagnosis. Body 2.4–2.6 mm in length, ca. 1.6× as long as wide. Dorsum brown. Each elytron with distinct nine rows of punctures, subhumeral row as long as ca. 1/3 of elytral length. The rows composed of minute punctures. Mesoventrite with one shallow excavation between median carina and transverse carina. Median carina of mesoventrite low. Mesotibiae without distinct sexual dimorphism. Metafemora robust. Male metatibiae weakly curved. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 2.6 mm; head 0.42 mm in length and 0.75 mm in width; pronotum 0.80 mm in length and 1.4 mm in width; elytra 1.8 mm in length and 1.6 mm in width.

Coloration. Dorsum shining and almost unicolor, brown; antennomeres 1–6 and 8 brown; antennomeres 7, 9, 10, and basal 3/5 of 11 blackish dark brown; apical 2/5 of antennomere 11 light brown; legs brownish and slightly paler than dorsum; mesoventrite, metaventrite, and abdominal ventrites brown.

Body 2.4–2.6 mm in length, ca. 1.6× as long as wide.

Head ca. 1.8× as wide as long, ca. 0.52× as long as and 0.54× as wide as pronotum, densely and very minutely punctate ( Fig. 10A ), usually bearing some large punctures ( Fig. 10A ); 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. 10C ); relative lengths of antennomeres 2 to 11: 2.8: 3.3: 1.2: 1.6: 1.2: 2.4: 1.0: 2.5: 2.5: 4.2.

Pronotum ca. 1.8× as wide as long, ca. 0.46× as long as and 0.86× as wide as pronotum, widest near base, simply and very feebly curved at posterior margin, distinctly and very minutely punctate, punctation same as that on head ( Fig. 10A ).

Scutellum very minutely punctate.

Elytra almost as long as wide or a little longer than wide in dorsal view, widest ca. at basal 1/3 ( Fig. 10A ), not transversely strigose; each elytron bearing nine rows of punctures with small number of punctures, with moderate number of very fine punctures between rows ( Fig. 10D ); row 9 invisible in dorsal view, subhumeral row ca. as long as 1/3 of elytral length ( Fig. 10B ); elyteral rows composed of minute but larger punctures than those of pronotum ( Fig. 10A ); sutural stria fine, arising from apex to ca. apical 3/5 of the elytral legnth.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, and with a shallow excavation between median carina and transverse carina ( Fig. 10E ); median carina of mesoventrite low ( Fig. 10E ); metaventrite without sexual dimorphism, sparsely pubescent, distinctly microreticulate except for almost smooth middle portion.

Legs showing sexual dimorphism on protarsi, mesotarsi, and metatibiae; protibiae gradually and very feebly widening from base towards apex ( Figs. 11E, 11F ); metafemur robust, and with a small dorsal projection posteroapically ( Figs.11G, 11H ).

Male. Tarsomeres 2–4 of protarsi and mesotarsi a little expanded ( Fig. 11A ); metatibiae weakly curved inwards ( Fig. 11C ); abdominal sternite 8 feebly curved ( Fig. 12C ); aedeagus relatively robust ( Figs. 12A, 12B ); median lobe triangular at apex in dorsal view ( Fig. 12A ), pointed apically in lateral view ( Fig. 12B ); each paramere bearing two apical setae and one small transparent lobe at apex, feebly expanded in ca. apical 1/ 10 in lateral view ( Fig. 12B ); inner sac complex ( Fig. 12A ).

Female. Protarsi and mesotarsi slender ( Fig. 11B ); metatibiae almost straight ( Fig. 11D ); abdominal sternite 8 with a spiculum ventrale at a central point of anterior margin ( Fig. 12D ); coxites and stylus as shown in Fig. 12E .

Differential diagnosis. Leiodes kandai sp. nov. is similar to L. babai in having relatively minute elytral punctures, but may be distinguished from the latter by the relatively small body (2.4–2.6 mm), male metatibiae distinctly curved inwardly ( Fig. 11C ), and having the median lobe triangular at the apex in dorsal view ( Fig. 12A ). In contrast, L. babai has a relatively large body (2.6–3.0 mm), male metatibiae feebly curved ( Fig. 8C ), and the median lobe protuberant apically ( Fig. 9A ). Leiodes kandai sp. nov. is also similar to L. subtilis ( Reitter, 1885) inhabiting Central Asia and the Russian Far East by having elytral rows composed of minute punctures, but may be separated from it by having the median carina of the mesoventrite low ( Fig. 10E ) while L. subtilis has a high carina of the mesoventrite.

Etymology. The specific name is dedicated to an excellent scholar of Western learning, Takahira Kanda (1830–1898), who was born in the type locality, Gifu Prefecture.

Distribution. Japan: Honshu (Gifu Prefecture).

Figures

Fig. 10. Leiodes kandai sp. nov. A – body, dorsal view; B – ditto, lateral view; C – antenna; D – elytral punctures; E – mesoventrite, lateral view. Scale I: 1 mm for A and B; II: 0.5 mm for C; III: 0.2 mm for E.

Fig. 11. Leiodes kandai 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. 12. Leiodes kandai 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; III: 0.1 mm for E.

Fig. 110. Distribution of Japanese species of Leiodes babai group: (●) L. kandai sp. nov., (▲) L. babai Nakane, 1989, (■) L. yoshidai sp. nov.; arrow – suggested migration pathway of L. babai group from the continent to Japan.

Fig. 8. Leiodes babai Nakane, 1989. 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–D; II: 0.2 mm for E and F; III: 0.2 mm for G and H.

Fig. 9. Leiodes babai Nakane, 1989.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 E; III: 0.1 mm for E.