Cephennodes (Cephennodes) myagdiensis, Jałoszyński, 2017

Jałoszyński, Paweł, 2017, Ant-like stone beetles on the roof of the world. Cephenniini of Nepal and Bhutan (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4349 (1), pp. 1-120 : 56-57

Cephennodes (Cephennodes) myagdiensis sp. n.

( Figs 149 , 167–170 , 223 )

Type material. Holotype: NEPAL (Myagdi District): ♂, one label: " Nepal 465 Myagdi Distr. / Myagdi Khola, Dobang / 2400 m, 25.V.1995 / MARTENS & SCHAWALLER" [white, printed] ( SMNS).

Diagnosis. BL 1.26 mm; abdominal sternite III in ventral view with basal transverse carina expanded stepwise posteriorly at middle, this expanded portion short and concave posteriorly, the same sternite also with posterior median projection which is subtriangular with rounded sides and blunt apex; apex of median lobe of aedeagus rounded; apical projection of aedeagus distant from apex of median lobe, with distal margin slightly concave and strongly oblique in relation to the long axis of aedeagus.

Description. Body of male ( Fig. 149 ) dark brown, weakly constricted between pronotum and elytra, strongly convex, covered with light brown setae; BL 1.26 mm.

Head subtrapezoidal, HL 0.15 mm, HW 0.33 mm; vertex and frons confluent, evenly and relatively strongly convex; supraantennal tubercles small and weakly elevated; eyes large, strongly convex, coarsely faceted. Punctures on central part of frons moderately large, relatively deep, separated by spaces slightly shorter than or equal to diameters of punctures, posteriorly punctures become gradually smaller and sparser; setae sparse, short, suberect. Antennae moderately long, compact, moderately thickened, pentamerous club indistinctly delimited; AnL 0.70 mm; antennomere I twice as long as broad; II similar in length but slightly narrower than I, 2.3 × as long as broad; III slightly narrower than II and 1.2 × as long as broad, IV as broad as III but slightly longer, 1.4 × as long as broad, V and VI similar in shape, each slightly shorter than IV, each about 1.3 × as long as broad; VII slightly broader and distinctly longer than VI, 1.2 × as long as broad; VIII as long as VII but distinctly broader, about as broad as long; IX much broader and longer than VIII, as long as broad; X slightly larger than IX, as broad as long; XI distinctly broader than X but shorter than IX–X together, about 1.7 × as long as broad.

Pronotum in dorsal view nearly semicircular, broadest slightly anterior to middle, PL 0.39 mm, PW 0.58 mm; anterior margin broadly rounded; lateral margins indistinctly microserrate, rounded, in posterior half distinctly convergent toward nearly right-angled hind corners; posterior margin distinctly bisinuate; lateral carinae narrow, fused with lateral margins; antebasal pits small and shallow, each slightly closer to posterior than lateral margins of pronotum. Punctures on disc very small and shallow, evenly and densely distributed, separated by spaces 1–1.5 × as wide as diameters of punctures; setae moderately dense, short, suberect.

Elytra short, oval, broadest slightly anterior to middle, EL 0.73 mm, EW 0.66 mm, EI 1.09. Humeral calli weakly elevated; subhumeral line on each elytron with small pit at base, equal in length to about 0.3 EL, distinctly oblique in relation to elytral suture and developed as a sharp stepwise border between more convex humeral region and less convex adsutural area; basal pit on each elytron large and connected to short, distinctly arcuate impression extending posteromesally; apices of elytra separately rounded. Punctures slightly more distinct than those on pronotum but still very fine, dense; setae short, moderately dense, suberect.

Hind wings not studied.

Metaventrite with large, moderately distinctly delimited postmesocoxal impressions, with median area covered with very fine punctures.

Abdomen ( Figs 167–168 ) with only sternite III modified, in ventral view sternite III bears broad transverse carina along its posterior margin, median portion of carina stepwise expanded posteriorly, this expanded portion short and broad, with concave posterior margin, posteriorly sternite III with subtriangular median projection with rounded sides and blunt apex.

Legs unmodified.

Aedeagus ( Figs 169–170 ) slender, AeL 0.18 mm, apex of median lobe rounded; apical projection distant from median lobe, its distal margin slightly concave and so strongly oblique in relation to the long axis of aedeagus that it becomes lateral margin; apex of apical projection subtriangular and broadly rounded; parameres very slender, unequal in length, not exceeding apex of median lobe, each with one apical seta.

Female. Unknown.

Distribution ( Fig. 223 ). Central Nepal.

Etymology. Locotypical; after the Myagdi District.

Remarks. Within this species group, only C. myagdiensis and C. letheanus have the sternite III bearing an abruptly demarcated, relatively narrow and long subtriangular posterior projection. Its shape is different in these species; in C. letheanus the projection has a pointed apex, in C. myagdiensis its apex is blunt. Also the basal carina of sternite III is clearly different in C. letheanus and C. myagdiensis ; it bears a rounded median lobe in the former species, and its posteromedian margin is concave in the latter.

Figures

FIGURES 148 – 155. Dorsal habitus of Cephennodes (s. str.) letheanus sp. n. (148), C. (s. str.) myagdiensis sp. n. (149), C. (s. str.) malla sp. n. (150), C. (s. str.) gorkha sp. n. (151), C. (s. str.) tharepatianus sp. n. (152), C. (s. str.) minisulcatus sp. n. (153), C. (s. str.) mustangensis sp. n. (154), and C. (s. str.) lalitpuranus sp. n. (155).

FIGURES 163 – 178. Abdomen of male in right lateral (163, 167, 171, 175) and ventral (164, 168, 172, 176) views and aedeagus in ventral (165, 169, 173, 177) and lateral (166, 170, 174, 178) views. Cephennodes (s. str.) letheanus sp. n. (163 – 166), C. (s. str.) myagdiensis sp. n. (167 – 170), C. (s. str.) malla sp. n. (171 – 174), C. (s. str.) gorkha sp. n. (175 – 178).

FIGURES 223 – 224. Distribution of Cephennodes (s. str.) letheanus sp. n. (223, circle), C. (s. str.) myagdiensis sp. n. (223, triangle), C. (s. str.) malla sp. n. (224, circle), C. (s. str.) gorkha sp. n. (224, circle).