Leiodes nagayamai, 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 : 119-122

publication ID	https://doi.org/ 10.5281/zenodo.4272467
DOI	https://doi.org/10.5281/zenodo.10845699
persistent identifier	https://treatment.plazi.org/id/03E98224-327A-0714-76E1-46DDFE60A08F
treatment provided by	Felipe
scientific name	Leiodes nagayamai
status	sp. nov.

Treatment

27. Leiodes nagayamai View in CoL sp. nov.

Japanese name: Nagayama-ô-tamakinokomushi ( Figs. 80–81 View Fig View Fig )

Type material. JAPAN: HOKKAIDO: HOLOTYPE, ♂, Sapporo City, Hyakumatsuzawa, 13.ix.2000, K. Uesugi leg. ( MNHAH).

Diagnosis. Body 5 mm in length, ca. 1.9× as long as wide. Dorsum brown. Each elytron with nine distinct rows of punctures, subhumeral row as long as ca. 1/3 of elytral length. Mesoventrite without distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Metafemora triangularly protuberant at about midlength of posterior margins and feebly expanded posteroapically. Metatibiae distinctly curved inwards and with some small robust spines at internal margins. Parameres extremely short.

Description. Measurements of holotype: Body length 5.0 mm; head 0.80 mm in length and 1.2 mm in width; pronotum 1.5 mm in length and 2.3 mm in width; elytra 3.0 mm in length and 2.6 mm in width.

Coloration. Dorsum almost unicolor, brown; antennomeres 1–6 and 8 brown; antennomeres 7, 9, 10, and basal half of antennomere 11 a little darkish brown; apical half of antennomere 11 light brown; legs brown; mesoventrite, metaventrite, and abdominal ventrites brown.

Head distinctly and densely punctate, bearing some large punctures ( Fig. 80A View Fig ); antennomeres 1–4 each longer than wide; antennomeres 5 and 11 each about as long as wide; remaining antennomeres each wider than long; antennomere 11 robust and clearly narrower than antennomere 10 ( Fig. 80C View Fig ); relative lengths of antennomeres 2 to 11 – 3.2: 3.7: 1.9: 2.1: 1.4: 2.8: 1.0: 3.4: 3.0: 4.0.

Pronotum widest at from basal half to base, feebly sinuate at posterior margin, distinctly punctate, punctation similar to that on head ( Fig. 80A View Fig ).

Scutellum minutely and sparsely punctate.

Elytra widest ca. at basal 1/3 ( Fig. 80A View Fig ), not transversely strigose; each elytron with nine rows of punctures, bearing small number of large punctures and dense very fine punctures between rows ( Fig. 80D View Fig ); row 9 invisible in dorsal view, subhumeral row as long as ca. 1/3 of elytral length ( Fig. 80B View Fig ); rows composed of larger punctures than those of pronotum ( Fig. 80A View Fig ); sutural stria fine, reaching from apex to ca. apical half of the elytral length.

Metathorcic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, without distinct excavation between median carina and transverse carina ( Fig. 80E View Fig ); median carina of mesoventrite low ( Fig. 80E View Fig ); metaventrite sparsely and finely pubescent, strongly microreticulate except for almost smooth middle portion; middle portion of metaventrite decumbently and densely pubescent ( Fig. 80F View Fig ).

Protibiae gradually widening from base towards apex ( Fig. 81C View Fig ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Fig. 81A View Fig ); metafemora triangularly protuberant at about midlength of posterior margins, feebly expanded posteroapically ( Fig. 81B View Fig ), with moderately large dorsal projection posteroapically ( Fig. 81D View Fig ); metatibiae distinctly and curved inwards, with some small robust spines at internal margins ( Fig. 81B View Fig ).

Abdominal sternite 8 strongly curved ( Fig. 81E View Fig ); aedeagus slender ( Figs. 81F, 81G View Fig ); median lobe rounded at apex in dorsal view ( Fig. 81F View Fig ) and very feebly curved in lateral view ( Fig. 81G View Fig ); each paramere extremely short, club-shaped, and bearing two apical setae ( Fig. 81F View Fig ).

Female. Unknown.

Differential diagnosis. Leiodes nagayamai sp. nov. is similar to L. fracta (Seidlitz, 1875) inhabiting the Russian Far East and Japan, in elytral shape, but can be distinguished from it by each elytron bearing row 9, a distinct subhumeral row in the basal third of elytra ( Fig. 80B View Fig ) and the male metatibiae being relatively weakly curved ( Fig. 81B View Fig ). In contrast, L. fracta has each elytron with row 9 almost straight and not comprising a subhumeral row ( Fig. 72B View Fig ) and the male metatibiae being relatively strongly curved ( Figs. 73C, 73D View Fig ). Leiodes nagayamai sp. nov. also resembles the Russian species, L. daffneri Perkovsky, 1990 in the morphology of the aedeagus, but can be separated from it by having the male metafemur with a moderately large dorsal projection posteroapically ( Fig. 81D View Fig ), and the aedeagus being rounded apically in the dorsal view ( Fig. 81F View Fig ). In contrast, L. daffneri has a large dorsal projection and its aedeagus is triangular apically. Leiodes nagayamai sp. nov. is also similar to L. rhaetica (Erichson, 1845) inhabiting the Holarctic region in having short parameres, but can be distinguished from it by having antennomere 11 clearly narrower than 10 ( Fig. 80C View Fig ). In contrast, L. rhaetica has the antennomere 11 almost as wide as 10th ( Fig. 96C View Fig ).