Leiodes araii, 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 : 66-69

12. Leiodes araii sp. nov.

Japanese name: Musashi-ô-tamakinokomushi ( Figs. 39–41 , 114)

Type locality. Japan, Honshu, Saitama Pref., Naguri Village, Mt. Arimayama (alt. 1200 m).

Type material. JAPAN: HONSHU: HOLOTYPE, ♂, Saitama Pref., Naguri Village, Mt. Arimayama (alt. 1200 m), 17–24.ix.2004, K.Arai and S. Arai leg. ( FIT) ( MNHAH). PARATYPES: 2 ♂♂, 12 ♀♀, same data as holotype ( FUFJ) ; 1 ♀, Saitama Pref., Mt. Ryogamisan, Tachiya–bori (alt. 800 m), 31.x.1999, T. Kishimoto & T. Shimada leg. ( TA) ( FUFJ) .

Diagnosis. Body about 2.5–3.2 mm long, ca. 1.8× as long as wide. Dorsum and antennae almost unicolor, brownish. 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 dense erect pubescence at middle portion. Mesotibiae without sexual dimorphism. Male metatibiae feebly curved. Median lobe of aedeagus almost straight at apical margins in dorsal view. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 3.0 mm; head 0.38 mm in length and 0.75 mm in width; pronotum 0.76 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 unicolor, brown; antennae brownish, antennomere 11 slightly whitish; legs brown with light brown tarsi; mesoventrite, metaventrite, and abdominal ventrites brown.

Body 2.5–3.2 mm in length, ca. 1.8× as long as wide.

Head ca. twice as wide as long, ca. 0.48× as long as and 0.55× as wide as pronotum, distinctly and densely punctate ( Fig. 39A ), usually bearing some large punctures ( Fig. 39A ); antennomeres 1–4 each longer than wide; antennomere 5 ca. as long as wide; remaining antennomeres each wider than long; antennomere 11 robust ( Fig. 39C ); relative lengths of antennomeres 2 to 11 – 4.6: 5.0: 3.0: 2.4: 2.0: 3.4: 1.0: 5.0: 5.2: 6.2.

Pronotum ca. 1.7× as wide as long, ca. 0.44× as long as and 0.88× as wide as elytra, widest at base, simply and very feebly curved at posterior margins, distinctly and densely punctate, punctation similar to that on head ( Fig. 39A ).

Scutellum minutely punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal half ( Fig. 39A ), not transversely strigose, densely, irregularly, and coarsely punctate ( Figs. 39A, 39B ); punctation of elytra consisting of punctures of various sizes ( Fig. 39D ); 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 with one distinct excavation between median carina and transverse carina ( Fig. 39E ); median carina of mesoventrite low ( Fig. 39E ); metaventrite showing sexual dimorphism, strongly microreticulate except for almost smooth middle portion.

Legs showing distinct sexual dimorphism of protarsi, mesotarsi, and metatibiae; protibiae gradually and very feebly widening from base towards apex ( Figs. 40E, 40F ); metafemur simply straight at posterior margin, with a small dorsal projection posteroapically ( Figs. 40G, 40H ).

Male. Middle portion of metaventrite with dense erect pubescence ( Fig. 39F ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Fig. 40A ); metatibiae very weakly curved ( Fig. 40C ); abdominal sternite 8 moderately curved ( Fig. 41D ); aedeagus slender ( Figs. 41A, 41B ); median lobe almost straight and very feebly expanded laterally from about apical 1/4 towards apex, almost straight on apical margins in dorsal view ( Fig. 41A ), moderately curved and bluntly pointed apically in lateral view ( Fig. 41B ); each paramere bearing two apical setae ( Fig. 41A ); inner sac as shown in Fig. 41C

Female. Middle portion of metaventrite with sparse decumbent pubescence ( Fig. 39G ); protarsi and mesotarsi slender ( Fig. 40B ); metatibiae almost straight ( Fig. 40D ); abdominal sternite 8 with a spiculum ventrale at central point of anterior margin ( Fig. 41E ); coxites and stylus as shown in Fig. 41F .

Differential diagnosis. The present new species is similar to L. multipunctata in irregularly punctate elytra, but may be distinguished from the latter by being unicolor brown in coloration. In contrast, L. multipunctata has a blackish antennal club. Leiodes araii sp. nov. also resembles L. yasudai sp. nov. in dorsal appearance, but can be separated from it by having the median lobe almost straight at the apical margins ( Fig. 41A ), whereas the median lobe is triangular at the apex in L. yasudai sp. nov. ( Fig. 23A ).

Etymology. This species is dedicated to Mr. Koji Arai who kindly gave me many valuable specimens used in this study.

Distribution. Japan: Honshu (Saitama Prefecture).

Figures

Fig. 39. Leiodes araii 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. 40. Leiodes araii 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: 1 mm for C and D; III: 0.2 mm for E and F; IV: 0.2 mm for G and H.

Fig. 41. Leiodes araii 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, and 0.1 mm for F.

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.