Acylophorus montanus

Janák, Jiří, 2018, Revision of the genus Acylophorus Nordmann, 1837 from Madagascar and Mascarene Islands (Coleoptera: Staphylinidae: Staphylininae: Acylophorina), Zootaxa 4462 (2), pp. 151-191: 177-178

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Acylophorus montanus

sp. nov.

Acylophorus montanus  sp. nov.

( Figs. 123–150View FIGURES 123–128View FIGURES 129–138View FIGURES 139–146View FIGURES 147–150, 169View FIGURES 166–171. 166, 176View FIGURES 172–177)

Type locality. Madagascar, N Andringitra: Vohidray rdg., 22 04' 15'' S, 46 58' 10'' E.

Type material. Holotype ♂: MADAGASCAR: “ E Madagascar, 10.– 11.4.2001, N Andringitra : Vohidray rdg., 3–4 km SSE of Amboarafibe, J. Janák lgt, 1600–1700 m ”, “rock, sifting of litter”, “among stumps vegetation”, „ HOLOTYPUS Acylophorus montanus  sp. nov., J. Janák det. 2017” ( JJRC)  . Paratypes: 1 ♀: “E Madagascar, 10.– 11.4.2001, N Andringitra : Vohidray rdg., 3–4 km SSE of Amboarafibe, J. Janák lgt, 1600–1700 m ”, “rock, under Philippia, sifting” ( JJRC)  ; 1 ♂: “E Madagascar: 8.– 9.4.2001, N Andringitra : Vohidray rdg., 3 km SSE of Amboarafibe, 1500–1600 m, J. Janák lgt.”, “rain forest, forest litter, sifting”, ( JJRC)  ; 2 ♂, 4 ♀: “E Madagascar, 12.– 18.4.2001, N Andringitra : Vohidray rdg., 3–5 km SE of Amboarafibe, 1750–1850 m, rock, J. Janák lgt.”, “rock, sifting of litter”, “among stumps vegetation” ( JJRC)  ; 1 ♂, 1 ♀: “ N Andringitra: 15.4.2001, Vohidray rdg., ▲ 1920 m env., N part, 1900–1920 m ,, J. Janák lgt.”, “rock, under Philippia, sifting.” ( JJRC)  ; 1 ♀: “ ABT / Sept. 2011/06 MADAGASCAR, AMBOHITANTELY Spec. Res.; 2.ix.2011; S18°10’52.5‘‘ E47°17’21.2‘‘, 1476m; sifting litter under big rock by stream, Winkler app. extraction, L.S. Rahanitriniaina lgt.” ( MMBC)GoogleMaps  ; 1 ♂: “ ABT / Sept. 2011/07 MADAGASCAR, AMBOHITANTELY Spec. Res.; 2.ix.2011; S18°10’52.3‘‘ E47°17’21.3‘‘, 1500m; sifting litter by stream; Winkler app. extraction, L.S. Rahanitriniaina lgt.” ( MMBC)GoogleMaps  ; 1 ♀: “ ABT / Nov. 2011/07 MADAGASCAR, AMBOHITANTELY Spec. Res.; 17.xi.2011; S18°11’48.5‘‘ E47°17’09.3‘‘, sifting forest litter under Pandanus, Winkler app. extraction; very dry material; 1595m; P. Baňař lgt.” ( MMBC)GoogleMaps  ; 1 ♂, 1 ♀: “ ABT / Nov. 2011/10 MADAGASCAR, AMBOHITANTELY Spec. Res.; 18.xi.2011; sifting forest litter under palm tree; Winkler app. extraction; ~ 1600m; P. Baňař lgt.” ( JJRC)  ; 2 ♀: “ ABT / Nov. 2011/13 MADAGASCAR, AMBOHITANTELY Spec. Res.; 1497m, S18°10’56.9‘‘ E47°17’21.9‘‘; 18.xi.2011; sifting forest litter; Winkler app. extraction; L.S. Rahanitriniaina lgt.” ( MMBC)GoogleMaps  ; 2 ♀: “ ABT / Nov. 2011/16 MADAGASCAR, AMBOHITANTELY Spec. Res.; 1620m S18°11’42.6‘‘ E47°17’10.8‘‘; 21.xi.2011; sifting forest litter under Pandanus ; Winkler app. extraction; L.S. Rahanitriniaina lgt.” ( MMBC)GoogleMaps  ; 2 ♂: “C MADAGASCAR 2016 AMBOHITANTELY Spec. Res., S18°11’51.7‘‘ E47°17’0.6‘‘, 1604m; sifting of leaf litter, 26.1.2016; P. Baňař lgt.” ( JJRC, MMBC). All paratypes with additional label: „ PARATYPUS Acylophorus montanus  sp. nov., J. Janák det. 2017”GoogleMaps  .

Description. Body length 5.5–7.7 mm (M= 6.4 mm, HT= 6.1 mm), forebody length 2.4–2.7 mm (M= 2.6 mm, HT= 2.6 mm). Body black ( Figs. 123, 125View FIGURES 123–128), elytra brown, abdominal tergites markedly bluish iridescent; antennae brown with complete first segment and segments 9–11 or 10–11 yellow; legs and maxillary palpi light reddish.

Head suboval ( Fig. 124, 126View FIGURES 123–128), about as long as wide (L/W=0.95–1.03, M=0.98, HT=0.96), slightly widened behind eyes, with two pairs of interocular setae. Temples markedly shorter than eyes (LT/LE=0.75–0.98, M=0.83, HT=0.82). Dorsal side of head shining, without micropunctures. Only sparse pale grey pubescence behind eyes. Four postocular setae visible on each side, additional seta on hind margin of eye absent. Mandibles each with one large tooth ( Fig. 127View FIGURES 123–128). Maxillary palpi with terminal segment wide and quite short, pubescent, asymmetric, only slightly wider and longer than glabrous penultimate segment which is triangular ( Fig. 128View FIGURES 123–128). First segment of antenna slightly longer than next five; segments 1 to 4 elongate, segment 5 about as long as wide or slightly transverse (L/W=0.89–1.07, M=0.97, HT=1.02), segments 6–9 transverse, segment 10 markedly transverse (R=0.61–0.88, M=0.77, HT=0.65).

Pronotum ( Figs. 124, 126View FIGURES 123–128) slightly transverse (W/L=1.10–1.15, M=1.12, HT=1.12), markedly widened behind with sides slightly rounded, widest in basal half, shining, without micropunctures. One pair of dorsal setae and one pair of lateral setae. Marginal setae short. Elytra markedly transverse (R=1.15–1.68, M=1.38, HT=1.51)) with short, pale, but not shining pubescence arising from dense aspirate punctures. Apical fringe of bristles slightly longer than pubescence on other parts of elytra. Abdominal tergites with short, sparse pubescence, interstices in transverse direction on middle part of tergite IV about three or four times as large as diameter of punctures. Meso- and metatarsi with short empodial setae, shorter than claws (similar as in Figs. 87, 88View FIGURES 87–90).

Male (n=5). Sternite 9 long and narrow ( Figs. 142, 146View FIGURES 139–146), apex of tergite 10 narrowly rounded, with very long setae ( Fig. 141, 145View FIGURES 139–146). Aedeagus ( Figs. 129–140, 143, 144View FIGURES 129–138View FIGURES 139–146) 0.70–0.76 mm long (M= 0.73 mm, HT= 0.70 mm). Parameres bilobed, lobes markedly separated, sensory pegs confusedly arranged in posterior quarter ( Figs. 140, 144View FIGURES 139–146). Median lobe slightly overreaching paramere, apex widely rounded ( Figs. 131–133, 136–138View FIGURES 129–138, 140, 144View FIGURES 139–146).

Female. Posterior margin of tergite 10 trunctate ( Fig. 147, 149View FIGURES 147–150), valves as in Fig. 148, 150View FIGURES 147–150.

Differential diagnosis. Acylophorus montanus  sp. nov. is very similar to A. hova  sp. nov., but differs by pronotum narrower, less widened behind, sparsely punctured abdomen, completely yellow last two or three antennal segments, more widely rounded apex of median lobe in males and truncate apical margin of tergite 10 in females.

Distribution. The new species is known only from Vohidray ridge in South-east Madagascar and from Ambohitantely in central Madagascar ( Fig. 176View FIGURES 172–177).

Bionomics. All specimens of Acylophorus montanus  sp. nov. were collected by sifting forest litter, among stumps vegetation and under Phillipia.

Discussion. The new species is known from two areas separated by distance about 600 km. Specimens from both areas were illustrated to demonstrate only low intraspecific variability.


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