Leiodes juzoi, 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 : 38-41

5. Leiodes juzoi sp. nov.

Japanese name: Jûzô-ô-tamakinokomushi ( Figs. 19–20 , 111 )

Type locality. Japan, Hokkaido, Rishiri Is., Kutsukata.

Type material. JAPAN: HOKKAIDO: HOLOTYPE, ♂, Rishiri Is. , Kutsukata , 3.x.1968, Y. Hori leg. ( EUMJ).

Diagnosis. Body about 2.5 mm long, ca. 1.6× as long as wide. Dorsum bicolored. Elytra light brown with dark brown stripes. Mesoventrite without distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Mesotibia protuberant at interoapical corner. Metatibiae weakly curved inwards.

Description. Measurements of holotype: Body length 2.5 mm; head 0.35 mm in length and 0.70 mm in width; pronotum 0.71 mm in length and 1.2 mm in width; elytra 1.6 mm in length and 1.4 mm in width.

Coloration. Dorsum shining and bicolored ( Fig. 19C ); head brown; pronotum light brown; elytra light brown with dark brown stripes placed near elytral suture and lateral margins ( Fig. 19C ); antennomeres 1, 2, and apical 2/5 of antennomere 11 light brown; antennomeres 3–6 and 8 brown; antennomeres 7, 9, 10, and basal 3/5 of antennomere 11 dark brown; legs brown; mesoventrite, metaventrite, and abdominal ventrites brown.

Head distinctly and densely punctate and bearing some large punctures ( Fig. 19A ); antennomeres 1–3 each longer than wide; antennomeres 4 and 11 each about as long as wide; remaining antennomeres each wider than long; antennomere 11 robust ( Fig. 19D ); relative lengths of antennomeres 2 to 11: 3.2: 4.0: 2.2: 1.8: 1.8: 3.2: 1.0: 4.6: 4.2: 5.8.

Pronotum widest at base, simply and very feebly curved at posterior margin, distinctly punctate, punctation similar to that on head ( Fig. 19A ).

Scutellum minutely punctate.

Elytra widest ca. at basal 1/3 ( Fig. 19A ), not transversely strigose; each elytron bearing nine rows of punctures, with many punctures between rows and therefore superficially not appearing to bear rows of punctures ( Figs. 19A, 19B, 19E ); most punctures of elytra larger than those of pronotum ( Fig. 19A ); sutural stria fine, reaching from apex ca. to apical half of elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, and without distinct excavation between median carina and transverse carina ( Fig. 19F ); median carina of mesoventrite low ( Fig. 19F ); metaventrite sparsely and finely pubescent, and strongly microreticulate except for almost smooth middle portion; middle portion of metaventrite with dense and erect pubescence ( Fig. 19G ).

Protibiae gradually and very feebly widening from base towards apex ( Fig. 20D ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Figs. 20A, 20B ); mesotibia strongly protuberant and bearing a robust spine at interoapical corner ( Fig. 20B ); metafemur with small dorsal projection posteroapically ( Fig 20E ); metatibiae weakly curved inwards ( Fig. 20C ).

Abdominal sternite 8 strongly curved ( Fig. 20H ); aedeagus generally slender ( Figs. 20F, 20G ); median lobe simply stick-like, rounded at apex in dorsal view ( Fig. 20F ), feebly curved in lateral view ( Fig. 20G ); each paramere bearing a small transparent lobe and two setae at apex ( Fig. 20F ); inner sac as shown in Fig. 20F .

Female. Unknown.

Differential diagnosis. Leiodes juzoi sp. nov. is similar to L. yasudai sp. nov. by the shape of the aedeagus, but can be distinguished from it by having the elytra with dark brown stripes ( Fig. 19C ) and male metafemur with a small dorsal posteroapical projection ( Fig. 20E ). In contrast, L. yasudai sp. nov. has almost unicolor elytra and male metafemur with a long projection curved inwards ( Fig. 22I ). Leiodes juzoi sp. nov. also resembles L. circinipes , but can be separated from it by having non-strigose elytra. In contrast, L. circinipes has strigose elytra ( Fig. 16E ).

Etymology. This species is dedicated to a famous explorer, Jûzô Kondô (1771–1829), who made a venture to the type locality, Rishiri Island.

Distribution. Japan: Hokkaido (Rishiri Is.).

Morphological note. The elytra of L. yasudai sp. nov. have many punctures between the rows of punctures ( Fig. 21A ), and therefore appear unstriate superficially. In contrast, the elytral rows of L. juzoi sp. nov. are a little more distinct than those of L. yasudai sp. nov. ( Fig. 19A ). However, the elytral morphology of both species is just quantitative difference of punctures. L. yasudai sp. nov. and L. juzoi sp. nov. have similar male middle legs and aedeagus ( Figs. 20B, 20F , 22C , 23A ), and may be related to each other.

Figures

Fig. 19. Leiodes juzoi 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. Scale I: 1 mm for A and B; II: 0.5 mm for D; III: 0.5 mm for F; IV: 0.5 mm for G.

Fig. 20. Leiodes juzoi sp. nov. A – male fore leg, ventral view; B – male middle leg, ventral view; C – male hind leg, ventral view; D – male protibia, dorsal view; E – male metafemur, dorsal view; F – aedeagus, dorsal view; G – ditto, lateral view; H – male abdominal sternite 8. Scale I: 0.5 mm for A and B; II: 0.5 mm for C; III: 0.2 mm for D; IV: 0.2 mm for E; V: 0.5 mm for F and G; VI: 0.2 mm for H.

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. 22. Leiodes yasudai 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: 1 mm for A–D; II: 1 mm for E and F; III: 0.2 mm for G and H; IV: 0.5 mm for I and J.

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

Fig. 23. Leiodes yasudai 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.