Nargus (Eunargus) franki Perreau 1997
Creators: name: Wang, Cheng-Bin
name: Růžička, Jan
name: Zhou, Hong-Zhang
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Leiodidae
Nargus
Nargus franki

description: Nargus (Eunargus) franki Perreau, 1997
(Figs. 2 A–B; 3A–J; 4A–F)
Perreau, 1997: 447 (Nargus (Eunargus); Type locality: CHINA: Fukien, Kuatun [ca. 27°40′N 117°40′E]); Perreau, 2000: 105 (Nargus (Eunargus); in catalog).
Material examined. CHINA, Fujian: 1♂, Kuatun [ca. 27°40′N 117°40′E], 8.IV.1946, Tschung sen. leg. // Nargus (Eunargus) / franki Perreau, 1997 / Jan Růžička det. 2005 (CJFR); 1♂, same data as previous (CJRZ); 1♀, Kuatun, 25.IV. [19]46, Tschung sen. leg. // Nargus (Eunargus) / franki Perreau, 1997 / Jan Růžička det. 2005 (CJFR); CHINA, Sichuan: 1♂, 2♀, Wolong Natur. Res. [ca. 31°06′N 103°15′E], 900 m, litter, 23. V.1994, Kurbatov [leg.] // Nargus (Eunargus) / franki Perreau, 1997 / Jan Růžička det. 2005 (CJFR); 1♀, same data as previous (CJRZ).
Redescription. Male. EBL: 3.8 mm. Length of different body parts: HL: AL: PL: ELL = 0.6: 1.6: 0.9: 2.1 mm; width: HW: EW: PW: ELW = 1.0: 0.1: 1.4: 1.6 mm. Proportion of antennomeres from base to tip in Μm (length × width): 175 × 87, 164 × 68, 157 × 73, 125 × 67, 118 × 69, 112 × 75, 139 × 83, 92 × 86, 126 × 100, 130 × 108, 191 × 105.
Habitus (Fig. 2 A) oval, rather convex and sublustrous. Moderately pigmented: mostly yellowish-brown; antennomeres 6 to 10 somewhat darker; each elytron with a large blackish-brown spot at middle. Dorsum continually covered with fine, recumbent, sallow pubescence.
Head retractile, HW / HL = 1.5. Surface covered with fine punctures, separated about 5–6 times of their diameter, interspaces with reticulate microsculpture. Frontoclypeal suture distinct. Clypeus subtrapezoidal, anterior margin substraight. Compound eyes well developed, EW / HW = 0.1. Antennae (Fig. 3 A) slender and long, AL / HW = 1.7; all antennomeres longer than wide; antennomere 3 slightly shorter than 2; antennomere 6 with length / width = 1.5; 11th longest, rather elongated.
Pronotum (Fig. 3 B) transverse, widest at about basal 2/5, PW / PL = 1.6. Sides rounded, regularly narrowing forward and backward from the widest point; hind corners absent, completely rounded. Posterior margin shallowly and widely emarginate in middle. Surface covered with fine punctures, interspaces with reticulate microsculpture.
Elytra widely oval, widest at about basal 3/8, ELL / EW = 1.3. Sides regularly curved, gradually narrowing from the widest point to apices; apices (Fig. 3 G) widely subrounded. Sutural striae present. Surface covered with fine punctures, interspaces with sparse microtrichiae. Metathoracic wings fully developed.
Prolegs thin and slender, with basal three protarsomeres (Fig. 3 C) expanded: TW / BTW = 1.3. Protibiae (Fig. 3 E) slightly dilated around middle and weakly narrowed towards apex. Profemora wider than protibiae. Mesotibiae slightly curved, mesotarsi simply linear. Metatibiae straight.
Abdominal ventrite VIII (Fig. 3 I) very shallowly and widely emarginate on posterior margin. Genital segment (Fig. 3 J) long and elliptical, with spiculum gastrale weakly sclerotized; genital plate narrow; tergite IX rounded ventro-apically.
Aedeagus (Figs. 4 A–C) with median lobe divided into two laminae: in dorsal view (Fig. 4 A), dorsal lamina extended over entire width of median lobe, strongly acuminated into a narrow, obliquely truncated apex, and bearing ca. 4 long and strong setae subapically on right side; while ventral lamina strongly and transversely reduced, shorter than dorsal lamina, situated at right side, with hook-like apex. Large tooth of internal sac extremely developed, slender and sinuate, projecting outward from median lobe. Parameres slender, slightly longer than median lobe, distinctly constricted below apices, each with two apical setae. In lateral view (Fig. 4 C), median lobe regularly bent ventrad, large tooth of internal sac upturned, and parameres almost with equal width throughout whole length. Internal sac with many minute denticles in basal part.
Female. Similar to male in general appearance (Fig. 2 B), but can be distinguished from following characters: protarsi (Fig. 3 D) simply linear; protibiae (Fig. 3 E) more slender; elytral apex (Fig. 3 H) slightly wider; ventrite VIII (Fig. 4 D) gently rounded at posterior margin, and with widely rounded spiculum ventrale; valvifer (Figs. 4 E&F) with 1 lateral seta; coxite (Figs. 4 E&F) with 3 subapical setae and 1 fine lateral seta; stylus (Figs. 4 E&F) minute, cylindrical, with 1 long apical seta.
Affinities. Nargus (Eunargus) franki Perreau is easily distinguished from other members of this subgenus by the combination of the following characters: body size small (3.8 mm); mostly yellowish-brown, each elytron with a large blackish-brown spot at the middle; metathoracic wings fully developed; aedeagus with dorsal lamina slender, with narrow apex; ventral lamina situated at right side in dorsal view, shorter than dorsal lamina; large tooth of internal sac simple, projected outward from median lobe; parameres slender, slightly longer than median lobe, and in lateral view almost with equal width throughout whole length.
Distribution. China (Fujian, Sichuan) (Fig. 1).
Remarks. We also examined two female paratypes, labeled “ CHINA, Zhejiang: Lin’an County, 500m, W. Tianmu Shan N. R. [ca. 30°20′N 119°25′E], 16.V.1996, J. Cooter // Cryptomeria - Liriodendron dominant high forest leaf litter. Winkler extractor // PARATYPE / NARGUS (EUNARGUS) FRANKI n. sp. / M. Perreau det. 1997 (CJRZ, OUMNH)”. After dissection, we found its metathoracic wings strongly reduced and ventrite VIII with narrowly subtriangular spiculum ventrale that is obviously different from Nargus (Eunargus) franki. Therefore, we think that they can represent an undescribed species very close to N. (E.) franki. Until discovery of male, we refrain from its formal description.
description: Published as part of Wang, Cheng-Bin, Růžička, Jan & Zhou, Hong-Zhang, 2015, Nargus (Eunargus) celli sp. nov. (Coleoptera: Leiodidae: Cholevinae: Cholevini), a new species from China, pp. 570-580 in Zootaxa 4012 (3) on pages 572-576, DOI: 10.11646/zootaxa.4012.3.10, http://zenodo.org/record/233111