Leiodes hijikatai, 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 : 72-75

publication ID

https://doi.org/ 10.5281/zenodo.4272467

DOI

https://doi.org/10.5281/zenodo.4339443

persistent identifier

https://treatment.plazi.org/id/03E98224-324B-0727-768F-4188FC92A118

treatment provided by

Felipe

scientific name

Leiodes hijikatai
status

sp. nov.

14. Leiodes hijikatai View in CoL sp. nov.

Japanese name: Hijikata-ô-tamakinokomushi ( Figs. 44–46 View Fig View Fig View Fig , 114)

Type locality. Japan, Honshu, Tokyo Pref., Okutama Town, Nippera, Mt. Kintaisan (alt. 1300 m).

Type material. JAPAN: HONSHU: HOLOTYPE, ♂, Tokyo Pref., Okutama Town, Nippera, Mt. Kintaisan (alt. 1300 m), 3.xi.2006, H. Kamezawa leg. ( MNHAH). PARATYPE: 1 ♂, Nagano Pref., Tone Village, near Kuribara-gawa River , 12.x.1996, S. Hatsushiba leg. ( FUFJ).

Diagnosis. Body 2.9–3.0 mm long, ca. 1.7× as long as wide. Dorsum light brown. Antennal club dark reddish brown. Elytra densely, irregularly and coarsely punctate. Mesoventrite with one distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Metafemur with a distinct ventral rectangular projection posteroapically. Metatibiae weakly or strongly curved.

Description. Measurements of holotype: Body length 3.0 mm; head 0.41 mm in length and 0.83 mm in width; pronotum 0.83 mm in length and 1.4 mm in width; elytra 1.9 mm in length and 1.7 mm in width.

Coloration (based on the holotype only as the paratype is teneral). Dorsum shining and unicolor, light brown; antennomere 1 brown; antennomeres 2–6 and 8 reddish brown; remaining antennomeres dark reddish brown; legs brownish; trochanter reddish brown; tarsi brown; remaining parts of legs light brown; mesoventrite, metaventrite, and abdominal ventrites light brown.

Body 2.9–3.0 mm in length, ca. 1.7× as long as wide.

Head ca. 2.1× as wide as long, ca. 0.48× as long as and 0.58× as wide as pronotum, distinctly and densely punctate ( Fig. 44A View Fig ); antennomeres 1–4 each longer than wide; antennomere 11 about as long as wide; remaining antennomeres each wider than long; antennomere 11 oval ( Fig. 44C View Fig ); relative lengths of antennomeres 2 to 11 – 2.8: 3.6: 2.3: 1.9: 1.6: 2.7: 1.0: 2.9: 2.7: 5.1.

Pronotum ca. 1.7× as wide as long, ca. 0.44× as long as and 0.85× as wide as pronotum, widest at base, simply and very feebly curved at posterior margin, distinctly and densely punctate, punctation similar to that on head ( Fig. 44A View Fig ).

Scutellum minutely punctate.

Elytra ca. 1.1× times as long as wide in dorsal view, widest ca. at basal 2/5 ( Fig. 44A View Fig ), not transversely strigose, densely, irregularly and coarsely punctate ( Figs. 44A, 44B, 44D View Fig ); most punctures of elytra a little larger than those on head and pronotum ( Fig. 44A View Fig ); sutural stria fine, reaching from apex to ca. apical half of elytral length.

Metathoracic wings fully developed.

Mesoventrite strongly microreticulate, impunctate, almost glabrous, with a distinct excavation between median carina and transverse carina ( Fig. 44E View Fig ); median carina of mesoventrite low ( Fig. 44E View Fig ); metaventrite sparsely pubescent, strongly microreticulate except for almost smooth middle portion.

Protibiae gradually and very feebly widening from base towards apex ( Fig. 45D View Fig ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Fig. 45A View Fig ); metafemur with a distinct ventral rectangular projection ( Figs. 45B, 45C View Fig ) and a small dorsal projection posteroapically ( Fig. 45E View Fig ); metatibiae bearing less than ten small robust spines at about basal 1/3 of internal margins, weakly curved in holotype ( Fig. 45C View Fig ) and strongly curved in paratype ( Fig. 45B View Fig ).

Abdominal sternite 8 moderately curved ( Fig. 45F View Fig ); aedeagus slender ( Figs. 46A, 46B View Fig ); median lobe weakly expanded laterally in apical half of lateral margins and feebly curved at apex in dorsal ( Fig. 46A View Fig ), moderately curved in lateral view ( Fig. 46B View Fig ); each paramere bearing two apical setae and one transparent slender lobe ( Fig. 46A View Fig ); inner sac without distinct sclerites ( Fig. 46C View Fig ).

Female. Unknown.

Differential diagnosis. Leiodes hijikatai sp. nov. is similar to L. araii sp. nov. in the form of the elytral punctures but can be distinguished from it by having dark reddish brown antennal club and having the metafemur with a distinct ventral posteroapical projection ( Figs. 45B, 45C View Fig ). In contrast, L. araii sp. nov. has the antennae almost uniformly brown and the metafemora weakly expanded posteriorly ( Figs. 40C, 40D View Fig ). Leiodes hijikatai sp. nov. is also similar to the European L. punctulata (Gyllenhal, 1810) by the irregularly punctate elytra and the mesoventrite bearing an excavation, but can be separated from it by having the lateral margins of the median lobe feebly curved at the apex in dorsal view ( Fig. 46A View Fig ). In contrast, L. punctulata has the median lobe protuberant apically.

Etymology. This species is dedicated to a very popular samurai Toshizô Hijikata (1835–1869) who was born in the Tama Region in which the type locality of this species is situated.

Distribution. Japan: Honshu (Tokyo and Nagano Prefectures).

MNHAH

MNHAH

FUFJ

FUFJ

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Leiodidae

Genus

Leiodes

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