Leiodes yoshitakei, 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 : 46-49

publication ID

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

DOI

https://doi.org/10.5281/zenodo.4339439

persistent identifier

https://treatment.plazi.org/id/03E98224-3231-075D-768A-42E8FE4EA0EF

treatment provided by

Felipe

scientific name

Leiodes yoshitakei
status

sp. nov.

7. Leiodes yoshitakei View in CoL sp. nov.

Japanese name: Yoshitake-ô-tamakinokomushi ( Figs. 24–26 View Fig View Fig View Fig , 111 View Fig )

Type locality. Japan, Hokkaido, Ebetsu City, Nopporo Forest Park

Type material. JAPAN: HOKKAIDO: HOLOTYPE, ♂, Ebetsu City, Nopporo Forest Park, 31.x.2001, S. Hori leg. ( FIT) ( MNHAH) . PARATYPES, 2 ♂♂, 2 ♀♀, same data as holotype ( FUFJ) ; 1 ♀, same data as holotype except for the date, 6.vi.2001 ( FUFJ) ; 1 ♂, same data as holotype except for the date, 24.x.2001 ( FUFJ) .

Diagnosis. Body 2.6–3.1 mm long, ca. 1.8× as long as wide. Dorsum bicolored. Head and pronotum dark brown. Elytra yellowish brown with black stripes, densely and strongly punctate between rows of punctures, transversely strigose. Mesoventrite without distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Male mesotibia protuberant at interoapical corner. Male metatibiae weakly curved. Female abdominal sternite 8 with a spiculum ventrale.

Description. Measurements of holotype: Body length 3.0 mm; head 0.45 mm in length and 0.77 mm in width; pronotum 0.74 mm in length and 1.3 mm in width; elytra 1.9 mm in length and 1.6 mm in width.

Coloration. Dorsum shining and bicolored ( Fig. 24C View Fig ); head usually dark brown, rarely brown, always with yellowish brown clypeus; pronotum usually dark brown, rarely brown; scutellum black; elytra yellowish brown with black stripes near elytral suture, elytral bases and lateral margins ( Fig. 24C View Fig ); antennomeres 1, 6, and 8 brown; antennomeres 7, 9, 10, and basal 3/5 of antennomere 11 black; apical 2/5 of antennomere 11 light brown; legs brownish; mesocoxae and metacoxae dark reddish brown; remaining parts of legs brown; mesoventrite and metaventrite dark reddish brown; abdominal ventrites brown.

Body 2.6–3.1 mm in length, ca. 1.8× as long as wide.

Head ca. 1.8× as wide as long, ca. 0.56× as long as and 0.57× as wide as pronotum, distinctly punctate ( Fig. 24A View Fig ), usually bearing some large punctures ( Fig. 24A View Fig ); antennomeres 1–4 each longer than wide; antennomere 11 about as long as wide; remaining antennomeres each wider than long; antennomere 11 robust ( Fig. 24D View Fig ); relative lengths of antennomeres 2 to 11: 2.8: 2.9: 1.7: 1.7: 1.2: 2.3: 1.0: 2.8: 3.0: 4.0.

Pronotum ca. 1.9×as wide as long, ca. 0.38× as long as and 0.86× as wide as elytra, widest at base, simply and very feebly curved at posterior margin, distinctly punctate, punctation similar to that on head ( Fig. 24A View Fig ).

Scutellum minutely punctate.

Elytra ca. 1.2× as long as wide in dorsal view, widest ca. at basal 2/5 ( Fig. 24A View Fig ), transversely strigose, densely, irregularly, and strongly punctate between rows of punctures, therefore superficially appearing not to bear rows of punctures ( Fig. 24A, 24B, 24E View Fig ); most punctures of elytra larger than those of head and pronotum ( Fig. 24A View Fig ); 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 without distinct excavation between median carina and transverse carina ( Fig. 24F View Fig ); median carina of mesoventrite low ( Fig. 24F View Fig ); metaventrite showing indistinct sexual dimorphism ( Figs. 24G, 24H View Fig ), sparsely and finely pubescent, strongly microreticulate except for almost smooth middle portion.

Legs showing distinct sexual dimorphism on protarsi, mesotibia, mesotarsi, and metatibia; protibiae feebly and gradually widening from base towards apex in dorsal view ( Figs. 25G, 25H View Fig ); metafemur slender ( Figs. 25E, 25F View Fig ), and with a small dorsal projection posteroapically ( Figs. 25I, 25J View Fig ).

Male. Pubescence of middle portion of metaventrite a little denser and thicker than in female ( Figs. 24G, 24H View Fig ); tarsomeres 2–4 of protarsi and mesotarsi expanded ( Figs. 25A, 25C View Fig ); mesotibia strongly protuberant and bearing a robust spine at interoapical corner ( Fig. 25C View Fig ); metatibiae weakly curved ( Fig. 25E View Fig ); abdominal sternite 8 strongly curved ( Fig. 26C View Fig ); aedeagus slender ( Figs. 26A, 26B View Fig ); median lobe gradually narrowed from apical 1/6 towards apex, and apically pointed in dorsal view ( Fig. 26A View Fig ), feebly curved and apically pointed in lateral view ( Fig. 26B View Fig ); each paramere transparent near apex, bearing two apical setae ( Fig. 26A View Fig ); inner sac as shown in Fig. 26A View Fig .

Female. Pubescence of middle portion of metaventrite relatively sparse and thin ( Fig. 14H View Fig ); protarsi and mesotarsi slender ( Figs. 25B, 25D View Fig ); mesotibia with slender spines at interoapical corner ( Fig. 25D View Fig ); metatibiae almost straight ( Fig. 25F View Fig ); abdominal sternite 8 with a spiculum ventrale at central point of anterior margin ( Fig. 26D View Fig ); coxites and stylus as shown in Fig. 26E View Fig .

Differential diagnosis. Leiodes yoshitakei sp. nov. is similar to L. circinipes ( Rye, 1873) by the transversely strigose elytra, but may be distinguished from the latter by having the body about 1.8 times as long as wide ( Fig. 24A View Fig ), head and pronotum being dark brown ( Fig. 24C View Fig ), metaventrite showing sexual dimorphism in pubescence of the median portion, and basal half of parameres relatively slender in lateral view ( Fig. 26B View Fig ). In contrast, L. circinipes has the body about 1.6 times as long as wide ( Fig. 16A View Fig ), the head and pronotum are brown ( Fig. 16C View Fig ), the metaventrite does not showing sexual dimorphism in pubescence, and the basal half of parameres is relatively thick in lateral view ( Fig. 18B View Fig ). Moreover, L. yoshitakei sp. nov. is also similar to L. rugosa Stephens, 1829 inhabiting Russian Far East by having striate elytra, but can be separated from it by parameres with two apical setae. In contrast, L. rugosa has parameres fringed with multiple setae at apex.

Etymology. This species is dedicated to Yoshitake Shima (1822–1874) who contributed to the reclamation of the Hokkaido island.

Distribution. Japan: Hokkaido.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Leiodidae

Genus

Leiodes

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