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

description: 22. Leiodes yukihikoi sp. nov.
Japanese name: Momonaga-ô-tamakinokomushi (Figs. 6, 67–69, 116)
Type locality. Japan, Kyushu, Miyazaki Pref., Aya Town, Kawanaka.
Type material. JAPAN: KYUSHU: HOLOTYPE, ♂, Miyazaki Pref., Aya Town, Kawanaka, 26.iv.2007, K. Iwakiri leg. (MNHAH); PARATYPES: 1 ♂, 1 ♀, same data as holotype (FUFJ); 3 ♂♂, Miyazaki Pref., Miyazaki City, Takaoka, Takafusa, 7.v.2007, K. Iwakiri leg. (FIT) (FUFJ); 3♂♂, 5♀♀, same data as the former except for the date, 27.v.2007; 2 ♂♂, 2 ♀♀, same data as the former except for the date, 6.vi.2004. HONSHU: 2 ♂♂, Okayama Pref., Mt. Nagi Town, Nagisan, 1.–8.vi.2005, S. Suzuki leg. (FIT) (FUFJ); 2 ♂♂, Mie Pref., Suzuka City, Ogisu-chô, Takigatani, 20.iv.2004, H. Yokozeki leg.; 1 ♂, same data as the former except for the date, 24.iv.2004; 1 ♀, Gifu Pref., Kani City, Ôgaya, Yasaka-rindô, 11.v.2003, K. Toyoshima leg. (FIT (FUFJ); 1 ♂, same data as the former except for the date, 18.v.2003; 1 ♀, same data as the former except for the date, 1.vi.2003; 2 ♂♂, 2 ♀♀, Shizuoka Pref., Gotenba City, Kamiyama, Nishikawa (alt. 300 m), 3–5.v.1980, K. Harusawa leg. (FUFJ); 3 ♂♂, Kanagawa Pref., Odawara City, 18.iv.1952, Y. Hirano leg. (NSMT); 1 ♂, Chiba Pref., Kimitsu City, Gôdaihata, 18.–22.iv.1997, N. Nitta leg. (MT) (FUFJ); 2 ♀♀, Tochigi Pref., Ashikaga City, Nagusakami-chô, 23-30.v.2007, H. Ohkawa leg. (FIT) (FUFJ); 1 ♂, Tochigi Pref., Ashikaga City, Omata-chô, Naruishi, 21.–27.v.2010, H. Ohkawa leg. (FIT) (FUFJ); 1 ♂, Aomori Pref., Mutsu City, Kawauchi-chô, Mt. Yunosawayama, 22.vi.1999, S. Araki leg. (FUFJ).
Diagnosis. Body 3.8–4.5 mm long, ca. 1.8× as long as wide. Dorsum brown or yellowish brown. Head concave on frons and vertex. Each elytron with nine distinct rows of punctures, subhumeral row absent. Mesoventrite with distinct excavation between median carina and transverse carina. Median carina of mesoventrite low. Male metafemur very slender, weakly and triangularly protuberant at ca. basal 2/5 of posterior margins, with a large dorsal projection posteroapically. Mesotibiae without distinct sexual dimorphism. Male metatibiae very feebly curved. Metatarsi with tarsomere 1 extremely long and distinctly curved. Aedeagus relatively small and its length less than 1/4 of the body length. Female abdominal sternite 8 with a spiculum ventrale.
Description. Measurement of holotype: Body length 4.5 mm; head 0.80 mm in length and 1.3 mm in width; pronotum 1.4 mm in length and 2.1 mm in width; elytra 2.8 mm in length and 2.5 mm in width.
Coloration. Dorsum shining and almost unicolor, brown or yellowish brown; antennae almost unicolor, brownish or bicolored; in bicolored antennae, antennomeres 1–8 brown; antennomeres 9, 10, and basal half of 11 dark brown; apical half of antennomere 11 slightly paler than 8; legs brown or yellowish brown; mesoventrite and metaventrite brown; abdominal ventrites brown or yellowish brown.
Body 3.8–4.5 mm in length, ca. 1.8× as long as wide.
Head ca. 1.7× as wide as long, ca. 0.58× as long as and 0.63× as wide as pronotum, distinctly and densely punctate (Fig. 67A), rough dorsally, distinctly concave on frons and vertex (Fig. 6E), sometimes bearing some large punctures (Fig. 67A); antennomeres 1–4 each longer than wide; antennomere 11 as long as wide; remaining antennomeres each wider than long; antennomere 11 oval and clearly narrower than 10 (Fig. 67C); relative lengths from antennomeres 2 to 11 – 3.2: 4.2: 2.4: 1.8: 1.4: 2.8: 1.0: 4.0: 3.5: 4.9.
Pronotum ca. 1.6× as wide as long, ca. 0.49× as long as and 0.88× as wide as elytra, widest near base, feebly sinuate at posterior margin, distinctly and densely punctate as head (Fig. 67A).
Scutellum distinctly punctate.
Elytra ca. 1.1× as long as wide in dorsal view, widest ca. at basal 2/5 (Fig. 67A), and not transversely strigose; each elytron with nine rows of punctures, bearing number of large punctures and moderate number of very fine punctures between rows (Fig. 67D); row 9 almost straight, subhumeral row nearly absent (Fig. 67B); the rows composed of larger punctures than those of pronotum (Fig. 67A); sutural stria fine, arising from apex to ca. apical half of the elytral length.
Metathoracic wings fully developed.
Mesoventrite strongly microreticulate, impunctate, almost glabrous, with a distinct excavation between median carina and transverse carina (Fig. 67E); median carina of mesoventrite low (Fig. 67E); metaventrite sexually dimorphic, sparsely pubescent and distinctly microreticulate except for the almost smooth middle portion.
Legs showing sexual dimorphism on protarsi, mesotarsi, metafemora, metatibiae, and metatarsi; protibiae gradually widening from base towards apex at internal margins (Figs. 68E, 68F).
Male. Middle portion of metaventrite densely and finely pubescent (Fig. 67F); tarsomeres 2–4 of protarsi and mesotarsi a little expanded (Fig. 68A); metafemur very slender, weakly and triangularly protuberant at about basal 2/5 of posterior margins (Fig. 68C), with a large dorsal projection posteroapically (Fig. 68G); metatibiae slender, very feebly curved, feebly sinuate at internal margins (Fig. 68C); tarsomere 1 of metatarsi extremely long and curved (Fig. 68C); abdominal sternite 8 strongly curved (Fig. 69C); aedeagus relatively short and relatively small, its length less than 1/4 of body length (Figs. 69A, 69B); median lobe a little constricted at apical 1/4 of lateral margins and apically round in dorsal view (Fig. 69A), almost straight in lateral view (Fig. 69B); each paramere relatively thick and bearing two apical setae (Fig. 69B).
Female. Middle portion of metaventrite sparsely and finely pubescent (Fig. 67G); protarsi and mesotarsi slender (Fig. 68B); metafemur relatively robust, weakly curved along posterior margin (Fig. 68D), with moderate dorsal projection posteroapically (Fig. 68H); metatibiae almost straight and relatively robust (Fig. 68D); tarsomere 1 of metatarsi almost straight (Fig. 68D); abdominal sternite 8 with spiculum ventrale at central point of anterior margin (Fig. 69D); coxites and stylus as shown in Fig. 69E.
Differential diagnosis. Leiodes yukihikoi sp. nov. is similar to L. okawai in having slender metafemora but can be distinguished from it by having a large body (3.8–4.5 mm), the head concave on frons and vertex (Fig. 6E), the male metafemur weakly and triangularly protuberant at about the basal 2/5 of the posterior margins (Fig. 68C), the median lobe a slightly constricted at the apical 1/4 of the lateral margins in the dorsal view (Fig. 69A). In contrast, L. okawai has a relatively small body (2.6–3.5 mm), almost flat head, the male metafemur feebly protuberant at about the middle of the posterior margins (Fig. 65C), and the median lobe almost straight at the lateral margins (Fig. 66A). The present species is also similar to L. rubiginosa (Schmidt, 1841) inhabiting Europe and the Russian Far East in having a thick aedeagus, but can be separated from it by the large body and mesoventrite with a distinct excavation between the median carina and transverse carina (Fig. 67E), whereas in L. rubiginosa, the body is 2.3–3.2 mm in length and the mesoventrite does not have any excavation.
Etymology. This species is dedicated to Mr. Yukihiko Hirano, who kindly offered the valuable specimens of Leiodes used in this study.
Distribution. Japan: Honshu and Kyushu.
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 102-106, DOI: 10.5281/zenodo.4272467