Apatetica intermedia Cameron, 1930

Chang, Jin-Kang, Schillhammer, Harald & Tang, Liang, 2024, A new species and some new distribution records of the genus Apatetica Westwood from China (Coleoptera, Staphylinidae, Apateticinae), ZooKeys 1212, pp. 65-77 : 65-77

Apatetica intermedia Cameron, 1930

Fig. 4 中型脊葬隐翅虫

Apatetica intermedia Cameron, 1930: 30; Madge 1980: 317.

Apatetica birmanica Jansson, 1946: 7.

Type material examined.

A. intermedia : There is one specimen in the BMNH from the type locality with the following label data: “ 60853 \ Doherty \ Birmah Ruby M es \ Fry coll. 1905 100. \ Apatetica intermedia Cam. i. l. “. It is not specifically labeled as the type, but it may be the type specimen.

A. birmanica : Holotype ♂: “ N. E. BURMA, Kambaiti , 2000 m, 4 / 6.1934 Malaise \ Typus \ Apatetica birmanica Jansson \ 6378 E 91 \ NHRS - JLKB 000027515 ” ( NHRS) ; 2 paratypes (sex not determined): “ N. E. Burma, Kambaiti , 7000 ft. 25-27 / 4 1934, R. MALAISE \ Paratypus \ 6376 [6377 resp.] E 91 \ NHRS - JLKB 000027541 [000027516 resp.] ” ( NHRS) .

Material examined.

China – Sichuan Prov. • 3 ♂♂, 3 ♀♀, SNCA 1158 – SNCA 1163 ; Dayi County, Xiling Snow Mt. ; 30 ° 38 ' 60 " N, 103 ° 10 ' 99 " E; alt. 1250 m; 31 Jul 2021; Zhao & Cai leg.; SHNU .

Measurements.

BL: 8.2–8.3 mm, FL: 6.4–6.7 mm. HW: 1.57–1.67 mm, PW: 3.23–3.43 mm, EW: 3.53–3.68 mm, AL: 2.84–2.89 mm, PL: 1.81–1.96 mm, EL: 3.58–3.77 mm.

Redescription.

(based on specimens from Sichuan). Body (Fig. 4 A, B ) entirely black, except antennomeres 10 and 11, and tarsi slightly reddish.

Head transverse; vertex with a pair of small punctate patches separated by a cluster of numerous punctures; punctation of portions near inner margin of eye very dense and elongated; interstices with distinct microsculpture. Antennae moderately long; antennomere 4, 5 approximately 1.8 times as long as broad, 6–10 weakly oblong.

Pronotum approximately 1.8 times as broad as long and 2.1 times as broad as head, broadest in posterior third, strongly tapering anteriad; explanate part of lateral margins narrow in anterior half, gradually becoming broader in posterior half; each side of the posterior margin with a tooth-like extension, exactly fitting into an emargination at base of elytra; anterior angles with weak projection, posterior angles sharply marked and directed posteriad; disc convex in cross-section, with a pair of groove-like dents at middle, punctation coarse and quite dense in anterior third, irregularly distributed in median third and almost absent in basal third.

Elytra short, 1.9–2.0 times as long as pronotum; anterior margin of shoulders with an abrupt excavation opposite the pronotal basal tooth; each elytron with nine finely punctate striae; intervals rather flat and with micropunctation; posterior margin of each elytron convex. Scutellum weakly transverse with transverse microsculpture. Legs short.

Abdomen with microsculpture, punctation dense and moderately coarse.

Male. Tergite VIII convex, proximally broad, apically obtusely pointed; aedeagus (Fig. 4 C – F ) 1.7 mm long; median lobe moderately slender, gradually tapering apicad, and apically moderately acute in ventral view; apical portion of ventral process straight in lateral view; parameres long and weakly slender, extending beyond apex of median lobe and curved ventrad apically.

Female. Tergite VIII flat, wedge-shaped, apically obtusely pointed.

Distribution.

China (Sichuan) and Myanmar. New to China.

Diagnosis.

Apatetica intermedia can be distinguished from all known congeners, except A. sikkimi Fauvel, 1895 , by the anterior margin of shoulders which have an abrupt excavation opposite the pronotal basal tooth. Apatetica intermedia differs from A. sikkimi by the relatively larger eyes, the weak projection on the anterior angles of pronotum (pronotal anterior angles with no projection in A. sikkimi ), and relatively sparser pronotal punctation.

Figures

Figure 4. Apatetica intermedia (SNCA 1158) A dorsal habitus B ventral habitus C, D aedeagus in lateral view E, F aedeagus in ventral view. Scale bars: 2 mm (A, B); 0.5 mm (C – F).