Leiodes yamauchii, 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 : 151-155

36. Leiodes yamauchii sp. nov.

Japanese name: Oni-ô-tamakinokomushi ( Figs. 104–106 )

Type locality. Japan, Shikoku, Tokushima Pref., Mima City, Anabuki-chô, Furumiya, Mt. Tsunatsuke-yama (alt. 1050 m).

Type material. JAPAN: SHIKOKU: HOLOTYPE: ♂, Tokushima Pref., Mima City, Anabuki-chô, Furumiya , Mt.Tsunatsuke-yama (alt. 1050 m), 20–26.vi.2007, K.Tanaka leg. ( FIT) ( MNHAH). PARATYPES: KYUSHU: 2 ♂♂, Yakushima Is. , Mt.Aikodake (alt. 150 m), 30.x.–2.xi.2007, T. Yamauchi at al. leg. (collision traps) ( FUFJ) ; 5 ♂♂, 3 ♀♀, same data as holotype ( FUFJ) ; 3 ♂♂, 2 ♀♀, same data as the holotype except for the date, 26.vi.–1.vii.2007 ( FUFJ). SHIKOKU: 1 ♂, Tokushima Pref., Nishi-iyayama Village, Mt. Keisokuzan , 6–29.vi.2003, K. Tanaka leg. ( FIT) ( FUFJ) ; 2 ♂♂, 1 ♀, Tokushima Pref., Mima City, Koyadaira , Mt. Ichinomori , Fujinoikedani (alt. 1350 m), 17.vi.–1.viii.2007, K. Tanaka leg. ( FIT) ( FUFJ) .

Diagnosis. Body large, 4.7–5.0 mm long, ca. 1.8× as long as wide. Dorsum brown or light brown. Each elytron with nine distinct rows of punctures, subhumeral row as long as ca. 1/3 or 1/4 of elytral length. Mesoventrite with one distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Mesotibiae without distinct sexual dimorphism. Metafemora robust in both sexes. Male metatibiae very feebly curved inwards. Female abdominal sternite 8 with a thick spiculum ventrale.

Description. Measurements of holotype: Body length 4.8 mm; head 0.92 mm in length and 1.3 mm in width; pronotum 1.4 mm in length and 2.3 mm in width; elytra 3.1 mm in length and 2.6 mm in width.

Coloration. Dorsum shining, almost unicolor, brown or light brown; antennomere 1 and apical 2/5 of antennomere 11 light brown; antennomeres 2–6 brown; antennomeres 9, 10, and basal 3/5 of antennomere 11 dark brown; legs brownish; all tarsi usually slightly paler than other parts; mesoventrite, metaventrite, and abdominal ventrites brown.

Body 4.7–5.0 mm in length, about 1.8 times as long as wide.

Head ca. 1.5× as wide as long, ca. 0.63× as long as and 0.56× as wide as pronotum, distinctly and densely punctate ( Fig. 104A ), sometimes bearing some large punctures ( Fig. 104A ); antennomeres 1–3 each longer than wide; antennomeres 4 and 11 each as long as wide; remaining antennomeres each wider than long; antennomere 11 robust ( Fig. 104C ); relative lengths of antennomeres 2 to 11 – 3.6: 3.8: 1.8: 1.7: 1.3: 2.6: 1.0: 3.2: 3.1: 5.2.

Pronotum ca. 1.7× as wide as long, ca. 0.46× as long as and 0.92× as wide as elytra, widest near base, simply and very feebly curved at posterior margin, distinctly and densely punctate, punctation similar to that on head ( Fig. 104A ).

Scutellum distinctly punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal 1/3 ( Fig. 104A ), not transversely strigose; each elytron with nine rows of punctures, bearing small number of large punctures and dense fine punctures between rows ( Fig. 104D ); row 9 invisible in dorsal view, subhumeral row as long as ca. 1/3 or 1/4 of elytral length ( Fig. 104B ); rows composed of punctures larger than those of pronotum ( Fig. 104A ); 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 distinct excavation between median carina and transverse carina ( Fig. 104E ); median carina of mesoventrite low ( Fig. 104E ); metaventrite without sexual dimorphism, sparsely pubescent, distinctly microreticulate except for almost smooth middle portion.

Legs showing sexual dimorphism on protarsi, protibiae, mesotarsi, and metatibiae; metafemora robust, with small dorsal projection posteroapically ( Figs. 105G , 106H ).

Male. Tarsomeres 2–4 of protarsi and mesotarsi strongly expanded ( Fig. 105A ); protibiae gradually and distinctly widening from base towards apex at internal margins ( Fig. 105E ); metatibiae slender and very feebly curved inwards ( Fig. 105C ); abdominal sternite 8 strongly curved ( Fig. 106D ); aedeagus robust ( Figs. 106A, 106B ); median lobe feebly sinuate along both sides, and distinctly protuberant apically in dorsal view ( Fig. 106A ), sharply curved near base, pointed apically in lateral view ( Fig. 106B ); each paramere slender, bearing a few apical setae and transparent slender lobe ( Fig. 106A ); inner sac as shown in Figs. 106A, C .

Female. Protarsi and mesotarsi slender ( Fig. 105B ); protibiae gradually and very feebly widening from base towards apex at internal margins ( Fig. 105F ); metatibiae almost straight ( Fig. 105D ); abdominal sternite 8 with robust spiculum ventrale at central point of anterior margin ( Fig. 106E ); coxites and stylus as shown in Fig. 106F .

Differential diagnosis. Leiodes yamauchii sp. nov. is one of the largest species of the Japanese species of Leiodes . In this character, L. yamauchii sp. nov. is similar to L. lucens ( Fairmaire, 1855) but can be distinguished from it by the elytral rows being composed of deep punctures ( Fig. 104A ) and the robust male metafemora ( Fig. 105C ). In contrast, L. lucens has elytral rows composed of relatively minute punctures ( Fig. 77A ) and characteristic male metafemora ( Fig. 78C ). Leiodes yamauchii sp. nov. is also similar to L. koreana Park & Ahn, 2007 in elytral shape, but can be separated from it by having a large body (4.7–5.0 mm long) and a robust aedeagus ( Fig. 104A ). In contrast, L. koreana has a relatively small body (3.2–4.4 mm long) and a slender aedeagus ( Fig. 29A ). Leiodes yamauchii sp. nov. also resembles L. silesiaca (Kraatz, 1852) inhabiting Europe and the Russian Far East by the large body and robust aedeagus, but can be distinguished from it by the metaventrite with the distinct excavation between the median carina and transverse carina ( Fig. 104E ). In contrast, L. silesiaca has the metaventrite without the excavation.

Etymology. The species name is dedicated to Dr. Takeo Yamauchi, who kindly offered valuable specimens of Leiodes used in this study.

Distribution. Japan: Shikoku and Kyushu (Yakushima Island).

Figures

Fig. 104. Leiodes yamauchii 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. 105. Leiodes yamauchii 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: 1 mm for A–D; II: 0.5 mm for E and F; III: 0.5 mm for G and H.

Fig. 106. Leiodes yamauchii sp. nov.A – aedeagus, dorsal view; B – ditto, lateral view; C – apex of aedeagus, ventral view; D – male abdominal sternite 8; E – female abdominal sternite 8; F – coxite and stylus. Scale I: 0.5 mm for A–C; II: 0.5 mm for D and E; III: 0.1 mm for F.

Fig. 77. Leiodes lucens (Fairmaire, 1855). 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: 0.2 mm for E; IV: 1 mm for F and G.

Fig.78.Leiodes lucens (Fairmaire, 1855).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: 1 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. 29. Leiodes koreana Park & Ahn, 2007.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.