Leiodes kiuchii, 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 : 75-79

15. Leiodes kiuchii sp. nov.

Japanese name: Marukogatano-ô-tamakinokomushi ( Figs. 1 , 47–49 , 114)

Type locality. Japan, Shikoku, Tokushima Pref., Kisawa Village, Okunoi

Type material. JAPAN: SHIKOKU: HOLOTYPE, ♂, Tokushima Pref., Kisawa Village, Okunoi, 12.–18.ix.2003, K. Tanaka leg. ( FIT) ( MNHAH). PARATYPES: 1 ♀, Tokushima Pref., Kisawa Village , Mt. Okunonoyama , 31.viii.2003, M. Yoshida leg. ( FUFJ) ; 1 ♂, Tokushima Pref., Kisawa Village, Okuyarito , 23.ix.–5.x.2003, K. Tanaka leg. ( FIT) ( FUFJ) ; 1 ♂, same data as the former except for the date and a collector, 3.–10.viii.2004, M. Yoshida leg. ; 1 ♀,

Tokushima Pref., Nagoro-Higashiya, Otomedani Valley, 12.–24.viii.2006, K. Tanaka leg. ( FUFJ). HONSHU: 1 ♂, Kyoto Pref., Mt. Minetoko, 31.ix.1998, H. Hoshina leg. ( FUFJ).

Diagnosis. Body 2.3–2.7 mm long, ca. 1.7× as long as wide. Dorsum usually bicolored. Elytra densely, irregularly and coarsely punctate. Mesoventrite with one distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Male metaventrite bearing erect and dense pubescence at middle portion. Mesotibiae without distinct sexual dimorphism. Metatibiae of both sexes relatively robust. Male metatibiae very feebly curved. Median lobe of aedeagus rectangular apically and bearing a tiny but sharply protuberant apex in dorsal view. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurement of holotype: Body length 2.6 mm; head 0.39 mm in length and 0.68 mm in width; pronotum 0.82 mm in length and 1.3 mm in width; elytra 1.7 mm in length and 1.4 mm in width.

Coloration. Dorsum shining, usually bicolored ( Figs. 47D, 47E ), rarely unicolor ( Fig. 47C ); head and pronotum brown, dark brown or blackish brown; elytra brown or dark brown, sometimes with dark brown stripe near elytral suture ( Fig. 47E ); antennomeres 1–6 and 8 brown; antennomere 11 light brown in apical 2/5; remaining antennomeres dark brown; legs brown with light brown tarsi; mesoventrite, metaventrite, and abdominal ventrites brown.

Body 2.3–2.7 mm in length, ca. 1.7× as long as wide.

Head ca. 1.9× as wide as long, ca. 0.46× as long as and 0.52× as wide as pronotum, distinctly and densely punctate ( Fig. 47A ), often bearing some large punctures ( Fig. 47A ); antennomeres 1–3 each longer than wide; antennomeres 4, 5, and 11 each about as long as wide; remaining antennomeres each wider than long; antennomere 11 oval ( Fig. 47F ); relative lengths of antennomeres 2 to 11 – 5.8: 5.6: 2.4: 2.4: 2.2: 4.0: 1.0: 5.4: 5.6: 7.2.

Pronotum ca. 1.6× as wide as long, ca. 0.47× as long as and 0.90× as wide as elytra, widest at base, simply and very feebly curved at posterior margin, distinctly and densely punctate, punctation similar to that on head ( Fig. 47A ).

Scutellum minutely punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal 1/3 ( Fig. 47A ), not transversely strigose, densely, irregularly and coarsely punctate ( Figs. 47A, 47B ); punctation of elytra consisting of punctures of various sizes ( Fig. 47G ); sutural stria fine, reaching from apex to ca. apical half of the elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, and with a distinct excavation between median carina and transverse carina ( Fig. 47H ); median carina of mesoventrite low ( Fig. 47H ); metaventrite showing sexual dimorphism, microreticulate except for almost smooth middle portion.

Legs with distinct sexual dimorphism on protarsi, protibiae, mesotarsi, metafemora, and metatibiae; metafemur expanded posteroapically ( Figs. 48E, 48F ) with small dorsal projection posteroapically ( Figs. 48I, 48J ); metatibiae relatively robust ( Figs. 48E, 48F ).

Male. Middle portion of metaventrite with erect pubescence ( Fig. 48A ); protibiae relatively strongly widening from base towards apex ( Fig. 48G ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Fig. 48C ); metafemora crenullate ca. at midlength of posterior margins ( Fig. 48E ); metatibiae very feebly curved ( Fig. 48E ); abdominal sternite 8 weakly curved ( Fig. 49D ); aedeagus slender ( Figs. 49A, 49B ); median lobe rectangular apically, bearing a tiny but a distinct projection at apex in dorsal view ( Fig. 49A ), moderately curved and pointed apically in lateral view ( Fig. 49B ); each paramere bearing two apical setae ( Fig. 49A ); inner sac as shown in Fig. 49C .

Female. Middle portion of metaventrite with sparse decumbent pubescence ( Fig. 48B ); protibiae gradually and very feebly widening from base towards apex ( Fig. 48H ); protarsi and mesotarsi slender ( Fig. 48D ); metafemur moderately sinuate at posterior margin ( Fig. 48F ); metatibiae almost straight ( Fig. 48F ); abdominal sternite 8 with a spiculum ventrale at a central point of anterior margin ( Fig. 49E ); coxites and stylus as shown in Fig. 49F .

Differential diagnosis. Leiodes kiuchii sp. nov. resembles L. hijikatai sp. nov. in the shape of the median lobe of the aedeagus, but may be distinguished from it by having relatively robust metatibiae ( Figs. 48E, 48F ) and the median lobe with a tiny but distinct projection at the apex in the dorsal view ( Fig. 49A ). In contrast, L. hijikatai sp. nov. has relatively slender metatibiae ( Figs. 45B, 45C ) and the median lobe with feebly curved lateral margins at the apex ( Fig. 46A ). Leiodes kiuchii sp. nov. is also similar to the European species L. ruficollis (J. Sahlberg, 1898) , in having the median lobe of the aedeagus distinctly protuberant apically, but can be separated from it by having the elytra irregularly punctate ( Figs. 47A, 47B ). In contrast, L. ruficollis has elytra with ordered rows of punctures.

Etymology. This species is dedicated to Mr. Morisato Kiuchi who kindly donated many valuable specimens of Leiodes used in this study.

Distribution. Japan: Honshu and Shikoku.

Figures

Fig. 1. Habitus. A – Hydnobius akitsuensis Hoshina & Sunada, 2003 (from HOSHINA & SUNADA 2003); B – Leiodes kiuchii sp. nov.; C – L. osawai Nakane, 1963; D – L. kamezawai sp. nov. Scale bars: 1 mm.

Fig.47.Leiodes kiuchii 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. 48. Leiodes kiuchii sp. nov. A – male metaventrite; B – female metaventrite; C – male fore leg, ventral view; D – female fore 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 and B; II: 0.5 mm for C and D; III: 0.5 mm for E and F; IV: 0.2 mm for G and H; V: 0.2 mm for I and J.

Fig. 49. Leiodes kiuchii 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; IV: 0.1 mm for F.

Fig. 45. Leiodes hijikatai sp. nov. A – male fore leg, ventral view; B – male hind leg of paratype, ventral view; C – ditto of holotype; D – male protibia, dorsal view; E – male metafemur, dorsal view; F –male abdominal sternite 8. Scale I: 0.5 mm for A; II: 0.5 mm for B and C; III: 0.2 mm for D; IV: 0.2 mm for E; V: 0.5 mm for F.

Fig. 46. Leiodes hijikatai sp. nov.A – aedeagus, dorsal view; B – ditto, lateral view; C – inner sac, dorsal view. Scale I: 0.5 mm for A and B; II: 0.1 mm for C.