Chaetarthria kuiyanae, Jia & Wang & Aston, 2018

Jia, Fenglong, Wang, Shi-shuai & Aston, Paul, 2018, Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region, Journal of Natural History 52 (37 - 38), pp. 2369-2384 : 2372-2374

publication ID	https://doi.org/ 10.1080/00222933.2018.1532023
publication LSID	lsid:zoobank.org:pub:8C5C12EE-94C7-4928-B91C-0DE17440A7C9
persistent identifier	https://treatment.plazi.org/id/9D16053D-FFAE-FFF0-FE2D-FC735E0FF9E1
treatment provided by	Felipe
scientific name	Chaetarthria kuiyanae
status	sp. nov.

Treatment

Chaetarthria kuiyanae View in CoL sp. nov.

( Figures 2a–f View Figure 2 and 6c View Figure 6 )

Type material

HOLOTYPE: Male ( SYSU), YUNNAN: ‘ Nabanhe N. R. Manfi, alt. 700m, 05-v.2009. Jia-Yao Hu & Zi-Wei Yin leg’ . PARATYPES (23 spec.): 7 spec . ( SHNU, SYSU): same data as holotype; 3 spec . ‘ YUNNAN, Nabanhe N. R., Manfei, N22.09.305 E100.41.291, Alt. 620m, 18 .xi .2008, HU Jia-Yao & TANG Liang leg’. 3 spec . ( SYSU): ‘ Guomenshan, Nabanhe Conv . 5.i.2004, Li & Tang Leg’; 1 spec . ( SHNU): ‘ Manfei, Nabanhe Conv ., 10.i.2004, Li & Tang leg’; 9 spec . [ IZCAS: IOZ (E) 2002509-2002511, 2002528, 2002542-546]: GUANGXI: ‘ Napo, Baihe , 440m, 9 .iv .1998, Haisheng Zhou leg’. (transcribed from Chinese).

Diagnosis

Elytra with narrow lateral yellow margin on posterior half ( Figure 2b,d View Figure 2 ); ventral surface dark brown, legs yellowish to reddish brown. Head and pronotum without ground punctures, but with very fine and detectable systematic punctures. Pronotum without distinct anterior angles, posterior angles acute ( Figure 2a View Figure 2 ). Elytra smooth, shining, without ground punctures, with very fine but detectable systematic punctures ( Figure 2d View Figure 2 ), lateral and apical portion with indistinct coarse punctures. Median lobe of aedeagus c. 2× as broad as one paramere medially, sides subparallel from base to anterior fifth, a little shorter than the parameres, anterior margin protruding, with a short flagellum arising out of the middle of anterior margin, gonopore large, transversely sub-oval ( Figure 6c View Figure 6 ).

Differential diagnosis

This species is close to C. almorana Knisch, 1924 and C. indica d’ Orchymont, 1920 . It can be distinguished from C. almorana by the median lobe of aedeagus not emarginated and without apical endosclerite; for distinction from C. indica see differential diagnosis under that species.

Description

Size and form. 2.2–2.5 mm. Broadly oval, strongly convex. Elytra slightly longer than wide. Colour. Dorsum piceous to black, with pronotum slightly lighter than elytra and head. Labrum yellow with dark colour posteriorly ( Figure 2a View Figure 2 ), sometimes almost dark brown with very narrow yellow anterior margin, sometimes uniformly yellow brown. Maxillary and labial palps, and antennomeres reddish brown, antennae with a dark club. Posterior half of lateral margin of elytra and elytral apex yellowish brown ( Figure 2b View Figure 2 ). Ventral surface dark brown. Mentum yellowish to reddish brown. Legs yellowish to reddish brown with lighter tarsomeres ( Figure 2c View Figure 2 ). Epipleura dark reddish brown. Head. Ground punctation on labrum, clypeus and frons undetectable. Systematic punctures on labrum, frons and clypeus very fine but detectable. Labrum not emarginate anteriorly. Eyes small, slightly protruding, separated by c. 5.6× the width of one eye. Maxillary palps about a half as long as width of head, apical palpomere almost symmetrical and longer than penultimate ( Figure 2f View Figure 2 ). Labial palps about one-third as long as width of mentum, apical palpomere conical, shorter than 2nd, 2nd palpomere with numerous long setae on inner and outer faces. Antennae 8-segmented, scape almost as long as following antennomeres combined, club loosely segmented. Mentum a little longer than wide, quadrate, not concave anteriorly ( Figure 2f View Figure 2 ); with very fine and scattered punctures anteriorly, not punctate medially. Thorax. Pronotum without distinct anterior angles ( Figure 2a View Figure 2 ), lateral margin of anterolateral angle dilated ( Figure 2e View Figure 2 ), posterior angles acute ( Figure 2a,e View Figure 2 ); lateral stria present, along the entire lateral margin, terminating posteriorly at the hind angle ( Figure 2e View Figure 2 ). Pronotal ground punctation undetectable, systematic punctures very fine but detectable. Elytra smooth and shining, without ground punctures on disc, but with very fine and detectable systematic punctures ( Figure 2d View Figure 2 ), lateral and apical portion with detectable irregular coarse punctures. Sutural stria reaching half of the elytral length ( Figure 2d View Figure 2 ), no series of punctures before sutural stria. Prosternum extremely short, only slightly convex, not carinate. Mesoventrite glabrous, slightly concave, with a median, transverse and lightly arcuate ridge at the level of anterior mesocoxal margin. Metaventrite slightly raised, a little more convex and sparsely pubescent medially. Metepisterna about 4.3× as long as wide, more densely pubescent than metaventrite, almost parallel sided except posteriorly, where inner margin bends smoothly towards outer margin. Procoxae densely pubescent, meso- and metacoxae glabrous. Femora with sharply defined tibial grooves on inner face; femora stout. Pro- and mesofemora densely pubescent except apical extremity ( Figure 2c View Figure 2 ); anterior half of metafemora densely pubescent, posterior half glabrous with some coarse punctures ( Figure 2c View Figure 2 ), posterodorsal margin densely pubescent. Tibiae slender, hardly flattened. Tarsi with five tarsomeres, first metatarsomere shorter than second. Abdomen. Ventrites 1–2 with a large cavity on each side, filled with a hyaline mass supported and covered by a fringe of long stiff yellow setae rising from anterior margin of 1st ventrite ( Figure 2c View Figure 2 ); 1st and 2nd ventrites carinate medially. Aedeagus ( Figure 6c View Figure 6 ). Paramere c. 1/2× as long as basal piece. Median lobe c. 2× as broad as one paramere medially, sides subparallel from base to anterior fifth, a little shorter than parameres, anterior margin protruding, with a short flagellum arising out of the middle of the anterior margin, gonopore large, transversely suboval.

Etymology

The species is named after Mrs Kui-Yan Zhang, a curator at the Chinese Academy of Sciences, Institute of Zoology, Beijing, China, who was very helpful to the senior author in checking specimens at IZCAS.

Distribution

Only known from Yunnan ( Figure 7 View Figure 7 ).