Rhagonycha (s.str.) longicornis Y. Yang, Xiao & Liu, 2024
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publication ID |
https://doi.org/ 10.11646/zootaxa.5534.1.1 |
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publication LSID |
lsid:zoobank.org:pub:C36ED8DA-FCF2-44FE-A38E-41112A1C0D6D |
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DOI |
https://doi.org/10.5281/zenodo.14023666 |
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persistent identifier |
https://treatment.plazi.org/id/F9023D04-FFD3-FFE8-FF69-E3FA3BE4EC33 |
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treatment provided by |
Plazi |
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scientific name |
Rhagonycha (s.str.) longicornis Y. Yang, Xiao & Liu |
| status |
sp. nov. |
Rhagonycha (s.str.) longicornis Y. Yang, Xiao & Liu , sp. nov.
( Figs 23C View FIGURE 23 , 24C View FIGURE 24 , 25A‒B View FIGURE 25 , 26A‒C View FIGURE 26 , 38 View FIGURE 38 )
Type material. HOLOTYPE: ♂ ( MHBU), CHINA, Xizang: Mêdog, Hanmi , 28.VII.2013, leg. X.L. Bai & J.S. Shan. PARATYPES: CHINA, Xizang: 1♂, 1♀ ( MHBU), same data as the holotype ; 4♂♂, 20♀♀ ( MHBU), same locality as the holotype, 2380 m, 9.VIII.2016, leg. G.D. Ren ; 2♂♂, 2♀♀ ( IZAS), Mêdog, Hanmi, No 1 Bridge , 1300‒ 2380 m, 10.VIII.2003, leg. H.J. Xue & X.P. Wang ; 1♀ ( IZAS), Nyingchi, Pêlung , 2100 m, 1.IX.2005, leg. X.L. Chen ; 1♀ ( IZAS), Zayü, Gujing , 1.VI.1973, leg. F.S. Huang ; 4♀♀ ( IZAS), Bomi, Yi’ong , 2300 m, 14.VIII.1983, leg. Y.H. Han ; 1♂ ( IZAS), same data as the preceding, 15.VIII.1983 ; 2♂♂, 1♀ ( CAU), Yi’ong , 2300 m, 29.VII.1978, leg. F.S. Li ; 1♂ ( CAU), same data as the preceding, 30.VII.1978 ; 1♀ ( CAU), same data as the preceding, 31.VII.1978 .
Differential diagnosis. It looks similar to Rh. spinosa in the shape of aedeagus, but can be distinguished from the latter by the following characters: legs and scutellum yellow, while black in Rh. spinosa ( Fig. 6A View FIGURE ); aedeagus: ventral process of each paramere feebly thinned near apex in ventral view, while obviously widened in Rh. spinosa ( Fig. 5D View FIGURE 5 ); conjoint dorsal plate of parameres feebly longer than ventral processes in lateral view, while obviously longer in Rh. spinosa ( Fig. 5F View FIGURE 5 ).
Description. Body length: 7.5‒8.4 mm (7.6 mm in holotype); width: 1.5‒2.1 mm (1.7 mm in holotype).
Male ( Fig. 25A View FIGURE 25 ). Coloration. Body yellowish orange except for the following parts: antennae black, except antennomeres Ⅰ–II yellowish orange, elytra pale yellow, almost transparent. Surface sparsely and finely yellow pubescent, anterior margin of clypeus fringed with pale bristles.
Head rounded, surface densely and finely punctate; eyes moderately protruding, head width across eyes 1.1 times wider than anterior margin of pronotum; terminal maxillary palpomeres subtriangular, widest at apical third; antennae extending to basal 3/4 length of elytra when reclined, antennomeres II shortest, about 2.7 times as long as wide at apices, III about 1.8 times longer than II, VI longest, XI feebly longer than X and pointed at apices.
Pronotum transverse, about 1.1 times as long as wide, anterior margin rounded, anterior angles subrounded, lateral margins feebly diverging posteriorly, posterior margin nearly straight, posterior angles sub-rectangular, disc strongly convex on posterolateral parts, surface finely and sparsely punctate.
Elytra with lateral margins feebly diverging posteriorly, about 3.5 times as long as humeral width, 4.0 times longer than pronotum, surface finely rugulose-lacunose, almost lustrous at basal parts.
Aedeagus moderately swollen laterally near middle ( Fig. 26A, B View FIGURE 26 ); ventral processes of parameres abruptly thinned apically near bases, slender and thinned at apices, bent to each other in ventral view ( Fig. 26A View FIGURE 26 ), and almost straight in lateral view, with apices widened and rounded ( Fig. 26C View FIGURE 26 ); conjoint dorsal plate feebly longer than ventral process ( Fig. 26C View FIGURE 26 ), with apical margin feebly emarginate in middle, lateral margins feebly diverging apically from middle, latero-apical angles widely rounded in dorsal view ( Fig. 26B View FIGURE 26 ), nearly straight in lateral view ( Fig. 26C View FIGURE 26 ); emargination between ventral process and conjoint dorsal plate about 2/5 length of aedeagus ( Fig. 26C View FIGURE 26 ).
Female ( Fig. 25B View FIGURE 25 ). Similar to male, but with larger and stouter body, eyes less protruding, head width across eyes about 0.8 times as wide as anterior margin of pronotum, antennae thinner and shorter, extending to apical third length of elytra when reclined, pronotum wider and about 1.3 times as wide as long, anterior margin less arcuate, disc feebly convex on posterolateral parts, elytra about 3.3 times as long as humeral width, with lateral margins moderately diverging posteriorly.
Internal organ of reproductive system ( Fig. 23C View FIGURE 23 ): vagina stout and abruptly thinned at ventroapical portion into a short and feebly stout tube, where diverticulum and spermathecal duct arising separately; diverticulum short and spiral, progressively thinned apically; spermathecal duct nearly as short as the apical tube of vagina; spermatheca provided with a spiral tube, progressively thinned apically and twice longer than diverticulum; accessory gland moderately long, about 1.5 times as long as spermatheca.
Abdominal sternite VIII ( Fig. 24C View FIGURE 24 ) strongly narrowed posteriorly, widely triangular at latero-apical angles, and shallowly emarginate on both sides of posterior margin, with the portion between lateral emarginations truncate at apex and nearly horizonital with apices of latero-apical angles.
Etymology. The specific name is derived from the Latin longus (long), and cornus (horn), and referring to its long antennae.
Distribution ( Fig. 38 View FIGURE 38 ). China (Xizang).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.