Leiodes shuheii, 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 : 90-94

19. Leiodes shuheii sp. nov.

Japanese name: Sakishima-kuromon-ô-tamakinokomushi ( Figs. 58–60 , 115 )

Type locality. Japan, Ryukyus, Yonaguni Is., Mt. Kubura-dake.

Type material. JAPAN: RYUKYUS: HOLOTYPE, ♂, Yonaguni Is., Mt. Kubura-dake , 15.–19.iii.2005, S. Nomura leg. ( FIT) ( MNHAH). PARATYPES: 1 ♂, same data as holotype ; 5 ♀♀, Yonaguni Is., Mt. Inbi-dake 15.–19.iii.2005, S. Nomura leg. ( FIT) ( FUFJ) .

Diagnosis. Body 2.4–2.8 mm long, ca. 1.9× as long as wide. Elytra bicolored. Each elytron with nine distinct rows of punctures and a subhumeral row as long as ca. 1/4 or 1/3 of elytral length. Mesoventrite without distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Mesotibiae without distinct sexual dimorphism. Metafemora showing sexual dimorphism. Male metatibiae feebly curved. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 2.8 mm; head 0.50 mm in length and 0.78 mm in width; pronotum 0.75 mm in length and 1.2 mm in width; elytra 1.7 mm in length and 1.4 mm in width.

Coloration. Dorsum shining; head brown; pronotum yellowish brown or brown ( Figs. 58C, 58D ); elytra bicolored, yellowish brown with black spots near elytral suture and lateral margins ( Figs. 58C, 58D ); antennomeres 1–6 brown; antennomere 8 dark reddish brown; antennomeres 7, 9, 10, and basal 3/5 of antennomere 11 blackish brown; apical 2/5 of antennomere 11 light brown; legs light brown or brown; procoxae, metacoxae and all trochanters a little darker than other parts; mesoventrite, metaventrite, and abdominal ventrites light brown.

Body 2.4–2.8 mm in length, ca. 1.9× as long as wide.

Head ca. 1.6× as wide as long, ca. 0.64× as long as and 0.61× as wide as pronotum, distinctly and densely punctate ( Fig. 58A ), usually bearing some large punctures ( Fig. 58A ); 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 oval ( Fig. 58E ); relative lengths of antennomeres 2 to 11 – 3.0: 3.1: 1.7: 1.4: 1.3: 2.9: 1.0: 3.9: 3.0: 5.0.

Pronotum ca. 1.7× as wide as long, ca. 0.44× as long as and 0.90× 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. 58A ).

Scutellum distinctly punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal 1/3 ( Fig. 58A ), not transversely strigose; each elytron with nine rows of punctures, bearing small number of large punctures and moderate number of very fine punctures between rows ( Fig. 58F ); row 9 invisible in dorsal view, subhumeral row ca. as long as 1/3 of elytral length ( Fig. 48B ); rows composed of punctures larger than those on pronotum ( Fig. 58A ); sutural stria fine, reaching from apex to ca. apical half of the elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, without distinct excavation between median carina and transverse carina ( Fig. 58G ); median carina of mesoventrite low ( Fig. 58G ); metaventrite without sexual dimorphism, sparsely pubescent, distinctly microreticulate except for almost smooth middle portion.

Legs sexually dimorphic on protarsi, mesotarsi, metafemora, and metatibiae; protibiae gradually and very feebly widening from base towards apex ( Figs. 59E, 59F ).

Male. Tarsomeres 2–4 of protarsi and mesotarsi a little expanded ( Fig. 59A ); metafemur with a large dorsal projection posteroapically ( Fig. 59G ); metatibiae feebly curved inwards, with some tiny spines along internal margins ( Fig. 59C ); abdominal sternite 8 weakly curved ( Fig. 60C ); aedeagus relatively robust ( Figs. 60A, 60B ); median lobe distinctly protuberant at apex in dorsal view ( Fig. 60A ), bluntly pointed apically in lateral view ( Fig. 60B ); each paramere bearing two apical setae and a transparent small apical lobe, feebly expanded ca. in apical 1/ 7 in dorsal view ( Fig. 60A ).

Female. Protarsi and mesotarsi slender ( Fig. 59B ); metafemur with a small dorsal projection posteroapically ( Fig. 59H ); metatibiae almost straight ( Fig. 59D ); abdominal sternite 8 with spiculum ventrale at central point of anterior margin ( Fig. 60D ); coxites and stylus as shown in Fig. 60E .

Morphological variability. Leiodes shuheii sp. nov. shows intraspecific variation of dorsal coloration ( Figs. 58C, 58D ). The differences do not correlate to body size.

Differential diagnosis. Leiodes shuheii sp. nov. is very similar to L. naraharai sp. nov. in the morphology of the aedeagus, but can be distinguished from it by having the elytra with relatively large black spots ( Figs. 58C, 58D ) and each paramere bearing a transparent small lobe at the apex ( Fig. 60A ). In contrast, L. naraharai sp. nov. has the elytra with slender black stripes ( Figs. 55C, 55D ) and each paramere pubescent at the apex ( Fig. 57A ). Leiodes shuheii sp. nov. resembles the Nepalese species L. fuscosuturalis Švec, 2008 in the dorsal coloration, but can be separated from it by having an almost unicolor pronotum and the median lobe distinctly protuberant apically ( Fig. 60A ), whereas the pronotum is maculate and the median lobe is simply triangular at the apex in L. fuscosuturalis .

Etymology. The species name is dedicated to Dr. Shûhei Nomura who kindly donated me many valuable specimens of Leiodes used in this study.

Distribution. Japan: Ryukyus (Yonaguni Island).

Figures

Fig. 58. Leiodes shuheii sp. nov.A – body, dorsal view; B – ditto, lateral view; C and D – dorsal color; E – antenna; F – elytral punctures; G – mesoventrite, lateral view. Scale I: 1 mm for A and B; II: 0.5 mm for E; III: 0.2 mm for G.

Fig. 59. Leiodes shuheii 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. 60. Leiodes shuheii 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. 115. Distribution of Leiodes naraharai group: (●) L. shuheii sp. nov. (■) L. naraharai sp. nov.

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

Fig. 57. Leiodes naraharai 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.