Leiodes nagayamai Hoshina 2012, sp. nov.
Creators: name: Hoshina, Hideto
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Leiodidae
Leiodes
Leiodes nagayamai

description: 27. Leiodes nagayamai sp. nov.
Japanese name: Nagayama-ô-tamakinokomushi (Figs. 80–81)
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); 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); 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).
Scutellum minutely and sparsely punctate.
Elytra widest ca. at basal 1/3 (Fig. 80A), 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); row 9 invisible in dorsal view, subhumeral row as long as ca. 1/3 of elytral length (Fig. 80B); rows composed of larger punctures than those of pronotum (Fig. 80A); 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); median carina of mesoventrite low (Fig. 80E); metaventrite sparsely and finely pubescent, strongly microreticulate except for almost smooth middle portion; middle portion of metaventrite decumbently and densely pubescent (Fig. 80F).
Protibiae gradually widening from base towards apex (Fig. 81C); tarsomeres 2–4 of protarsi and mesotarsi expanded (Fig. 81A); metafemora triangularly protuberant at about midlength of posterior margins, feebly expanded posteroapically (Fig. 81B), with moderately large dorsal projection posteroapically (Fig. 81D); metatibiae distinctly and curved inwards, with some small robust spines at internal margins (Fig. 81B).
Abdominal sternite 8 strongly curved (Fig. 81E); aedeagus slender (Figs. 81F, 81G); median lobe rounded at apex in dorsal view (Fig. 81F) and very feebly curved in lateral view (Fig. 81G); each paramere extremely short, club-shaped, and bearing two apical setae (Fig. 81F).
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) and the male metatibiae being relatively weakly curved (Fig. 81B). In contrast, L. fracta has each elytron with row 9 almost straight and not comprising a subhumeral row (Fig. 72B) and the male metatibiae being relatively strongly curved (Figs. 73C, 73D). 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), and the aedeagus being rounded apically in the dorsal view (Fig. 81F). 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). In contrast, L. rhaetica has the antennomere 11 almost as wide as 10th (Fig. 96C).
Etymology. The species name is dedicated to a brave samurai Yaichirô Nagayama (1837–1877) who contributed to the reclamation of Hokkaido.
Distribution. Japan: Hokkaido.
description: Published as part of Hoshina, Hideto, 2012, Review of the tribes Sogdini and Leiodini from Japan and North Chishima Islands. Part II. Genera Hydnobius and Leiodes (Coleoptera: Leiodidae), pp. 1-168 in Acta Entomologica Musei Nationalis Pragae (suppl. 1) (suppl. 1) 52 on pages 119-122, DOI: 10.5281/zenodo.4272467