Grouvellinus loong, Jiang & Wu & Chen, 2024

Jiang, Ri-Xin, Wu, Ping-Lan & Chen, Xiang-Sheng, 2024, Five new species of the genus Grouvellinus Champion, 1923 from Guizhou Province, China (Coleoptera, Elmidae), ZooKeys 1219, pp. 73-97 : 73-97

publication ID	https://doi.org/ 10.3897/zookeys.1219.125754
publication LSID	lsid:zoobank.org:pub:4281D66E-AE5B-4F65-B5C1-92D02B3BFBF6
DOI	https://doi.org/10.5281/zenodo.14232173
persistent identifier	https://treatment.plazi.org/id/B2475873-489A-5D94-B78B-CCF07AE3771A
treatment provided by	ZooKeys by Pensoft
scientific name	Grouvellinus loong
status	sp. nov.

Treatment

Grouvellinus loong sp. nov.

Figs 1 A View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 12 A, F View Figure 12

Material examined.

(42 exs: 21 ♂♂, 21 ♀♀): Holotype: China • ♂, labeled ‘ China: Guizhou, Qiannan Buyi and Miao Autonomous Prefecture (黔南布依族苗族自治州), Luodian County (罗甸县), Luokun Town (罗悃镇), Xiangshui Village (响水村), 25°19'43"N, 106°38'28"E, H: 666.10 ± 6.40 m, 09. XI. 2022, Jiang Ri-Xin leg. ’ ( GUGC) GoogleMaps . Paratypes: China • 20 ♂♂, 21 ♀♀, with same label data as the holotype ( GUGC) GoogleMaps .

Diagnosis.

Body obovate; elytra dark brown, with weak cupreous metallic luster, each elytron with yellowish brown spot at base and near apex. Elytral intervals III, V, VII, and VIII carinated; carinae granulated, those on interval III short, extending from base to ~ 1 / 3 of elytral length; other carinae long and extending from base nearly to elytral apex. Lateral margins of elytra granulated. Aedeagus with median lobe constricted near middle and in apical 1 / 3; apex narrowed, subacute. Parameres nearly as long as median lobes, strongly narrowed at basal 1 / 3, apex rounded, lateral portion with long setae at apical 1 / 3.

Description.

Male. Body obovate (Fig. 1 A View Figure 1 ); head, pronotum and elytra black or dark brown, with weak cupreous metallic luster; femora and tibiae black; tarsi and antenna reddish brown; elytra with four reddish brown spots. Plastron area confined to head except for frons, vertex, and clypeus, lateral portions of prosternum, ninth elytral interval and epipleura, lateral portions of mesosternum, metaventrite, abdomen, femora, and tibia.

Head (Fig. 2 A View Figure 2 ) wider than long, dorsal surface with dense short setae (except discal part) and large round punctures, longer setae sparsely and finely located at dorsal surface. Clypeus evenly punctate with large round punctures and with sparse long setae. Labrum transverse, slightly narrower than clypeus, surface distinctly microreticulated, apical 1 / 2 covered with sparse long setae, lateral margins with long bristles, apical margin rounded.

Pronotum (Fig. 2 B View Figure 2 ) wider than long, widest at base, narrowed anteriad. Disc sparsely punctured on admesal portion, punctures with longer adpressed setae, intervals glabrous, shiny; longitudinal mesal portion with dense small punctures along posterior 2 / 3, impression absent; surface densely granulated. Anterior margin arcuate, anterior angles distinctly produced and acutangular with subacute apex; pronotal margins finely curved. Basal margin trisinuate, posterior angles acutangular, with apex rounded. Sublateral carinae distinct, extending from base to ~ 1 / 2 length of pronotum; basal 1 / 2 straight, near parallel; apical 1 / 2 curved; each side of sublateral carinae with a shallow and indistinct oblique impression, extending from apical end of carina to near anterior angle. Prosternal process (Fig. 2 D View Figure 2 ) with weakly curved apex, surface densely covered with large punctures.

Scutellum (Fig. 2 B View Figure 2 ) subtriangular, wider than long, widest near middle; surface covered with large punctures and each puncture bearing a short seta; lateral margins finely curved, apex obtuse.

Elytra (Fig. 2 C View Figure 2 )> 1.5 × as long as wide, widest at base, narrowed to apex. Granulate carinae on intervals III, V, VII, and VIII; carina on interval III short, ~ 1 / 3 length of elytra; other carinae long, extending from base of elytra to near apex. Lateral margins of elytra granulated. Each elytron with two reddish brown spots, one at base and another one near apex.

Metaventrite (Fig. 2 D View Figure 2 ), surface rough with sparse long setae and large round punctures at disc. Median sulcus long but indistinct, extending from posterior margin to anterior 1 / 4, basal 1 / 4 wide and deep, apical 3 / 4 thin and shallow. Lateral sides of disc with series of elliptical shallow impression.

Abdomen. Middle regions of ventrites I – IV and anterior part of ventrite V punctured (Fig. 2 D View Figure 2 ), covered with sparse large round punctures, each puncture bearing a long seta. Other parts of abdomen (Fig. 2 D View Figure 2 ) covered with plastron and mixed with sparse long setae. Apex of ventrite V rounded. Ventrite I with well-developed pair of admedian carinae, straight, extending from base to apex.

Legs simple, surface granulated; femora widened, surface with plastron; inner side of tibiae with cleaning fringes; metatibiae (Fig. 2 E View Figure 2 ) distinctly narrowed near apex; tarsi slightly shorter tibiae; tarsal claws simple.

Genitalia. Aedeagus (Fig. 3 A – D View Figure 3 ), long and wide, symmetrical; median lobe slightly surpasses parameres, narrowed near middle and in apical 1 / 3, apex narrowed, subacute. Parameres (Fig. 3 D View Figure 3 ) strongly narrowed at basal 1 / 3, with apical portion narrowed; apical 2 / 5 covered with long setae.

Female. Externally similar to the male, averagely larger, metatibiae (Fig. 2 F View Figure 2 ) not narrowed near apex. Ovipositor as in Figs 12 A, F View Figure 12 . Stylus short and narrow, weakly curved, ~ 1 / 6 as long as distal portion of coxite. Coxite long, with apex distinctly expanded, roundly broadened at outer margin, apex with several short and curved sensilla. Distal portion of coxite nearly straight, surface with sparse, very short and acute setae. Proximal portion of coxite short, longer than 1 / 3 length of distal portion, surface with sparse, very short and acute setae. Valvifers slightly shorter than coxite, longitudinal baculum curved.

Measurements.

Male (n = 10): CL: 1.81–1.89 mm (1.85 ± 0.03); PL: 0.51–0.54 mm (0.52 ± 0.01), PW: 0.68–0.74 mm (0.70 ± 0.02); EL: 1.30–1.35 mm (1.33 ± 0.02), EW: 0.90–0.93 mm (0.91 ± 0.01).

Female (n = 10): CL: 1.68–2.08 mm (1.90 ± 0.12); PL: 0.49–0.63 mm (0.56 ± 0.05), PW: 0.62–0.80 mm (0.71 ± 0.06); EL: 1.20–1.45 mm (1.35 ± 0.09), EW: 0.86–0.96 mm (0.91 ± 0.04).

Distribution.

China (Guizhou).

Biology.

All adults were collected from submerged stone in small ravine stream (Fig. 14 A – C View Figure 14 ).

Etymology.

The specific epithet ‘ loong ’ is the most famous auspicious beast in Chinese ancient myth, and also is a member of the Chinese Zodiac Signs.

Comparative diagnosis.

The new species can be placed in the Grouvellinus acutus species group by the following characters: 1) body small; 2) elytra with yellowish brown markings; 3) pronotum without longitudinal impression; 4) surface of elytra with granulate carinae on strial intervals III, V, VII, and VIII; 5) ventrite I with a pair of well-developed admedian carinae. The G. acutus species group includes three known species, all of them occurring in China. Members of this group are similar in habitus. G. loong sp. nov. can be easily distinguished from other members of this group by the obviously different shape of the aedeagus: strongly narrowed at middle (vs not as above).

Grouvellinus loong sp. nov. is most similar to G. acutus Bian & Jäch, 2018 in habitus. These species can be distinguished by the following characters: 1) prosternal process with weakly curved apex, surface not granulated, densely covered with large punctures in G. loong sp. nov. (vs prosternal process with broadly rounded apex, surface sparsely granulated in G. acutus ); 2) metatibia distinctly narrowed near apex, without hooked appendage at apex in G. loong sp. nov. (vs apex of metatibia conspicuously broad and sclerotized, usually with hooked appendage in G. acutus ); 3) parameres of aedeagus strongly narrowed at basal 1 / 3 in G. loong sp. nov. (vs only weakly narrowed near base in G. acutus ).