Acylophorus mauritianus, Janák, 2018

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: 170-175

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Acylophorus mauritianus

sp. nov.

Acylophorus mauritianus   sp. nov.

( Figs. 93–107 View FIGURES 93–98 View FIGURES 99–107 , 170 View FIGURES 166–171. 166 )

Type locality. Mauritius, Mt. Le Pouce , 20° 11' 48'' S, 57° 31' 21'' E. GoogleMaps  

Type material. Holotype ♂: “ Mauritius, Mt. Le Pouce , 16.– 22.1.2006, 700–770 m, 20° 11' 48'' S, 57° 31' 21'' E, rain forest, forest litter sifting, J. Janák lgt.” ( JJRC) GoogleMaps   . Paratypes: 2 ♂, 2 ♀: same data ( JJRC) GoogleMaps   .

Description (n=5). Body length 6.5–7.2 mm (M= 6.8 mm, HT= 6.9 mm), forebody length 2.7–2.8 mm (M= 2.8 mm, HT= 2.8 mm). Body black or dark brown ( Figs. 93–95 View FIGURES 93–98 ), pronotum brown or red, elytra brown, brown with reddish shoulders or completely red, abdomen black to dark reddish brown, abdominal tergites moderately iridescent; antennae brown with base of first segment and segments 8–11 light reddish; legs and maxillary palpi reddish brown.

Head very long and narrow ( Fig. 96 View FIGURES 93–98 ), markedly longer than wide (L/W=1.13–1.21, M=1.17, HT=1.18), slightly widened behind eyes, with two pairs of interocular setae. Temples moderately longer than eyes (LT/ LE=1.09–1.23, M=1.16, HT=1.14). Dorsal side of head with fine very sparse micropunctures. Dense pale grey pubescence behind eyes. Four postocular setae visible on each side, additional seta on hind margin of eye absent. Left and right mandible each with two teeth ( Fig. 97 View FIGURES 93–98 ). Maxillary palpi with terminal segment wide and long, pubescent, asymmetric, wider and much longer than short glabrous triangular penultimate segment ( Fig. 98 View FIGURES 93–98 ). First segment of antenna nearly as long as next four; segments 1 to 6 elongate, segment 5 slightly to markedly longer than wide (R=1.16–1.37, M=1.28, HT=1.16), segment 7 about as long as wide, segments 8–9 transverse, segment 10 markedly transverse (R=0.69–0.81, M=0.76, HT=0.76).

Pronotum slightly transverse (R=1.03–1.08, M=1.06, HT=1.03), markedly widened behind with sides only slightly rounded, widest in basal half ( Fig. 96 View FIGURES 93–98 ), shining, with fine and sparse micropunctures similar to those on head. One pair of dorsal setae and one pair of lateral setae. Marginal setae short. Elytra markedly transverse (R=1.08–1.15, M=1.11, HT=1.09) Abdominal tergites with short, sparse pubescence, interstices in transverse direction on middle part of tergite IV about three times as large as diameter of punctures. Meso- and metatarsi with empodial setae short, almost invisible (similar as in Figs. 87, 88 View FIGURES 87–90 ).

Male (n=3). Sternite 9 very long and narrow ( Fig. 105 View FIGURES 99–107 ), apex of tergite 10 narrowly rounded, with very long setae ( Fig. 104 View FIGURES 99–107 ). Aedeagus ( Figs. 99–103 View FIGURES 99–107 ) 0.76–0.79 mm long (M= 0.77 mm, HT= 0.79 mm). Parameres bilobed, lobes narrowly separated, sensory pegs confusedly arranged at the very apex ( Fig. 103 View FIGURES 99–107 ). Median lobe of aedeagus markedly overreaching paramere, apex rounded ( Figs. 101, 103 View FIGURES 99–107 ).

Female. Tergite 10 subtruncate apically ( Fig. 106 View FIGURES 99–107 ), valves as in Fig. 107 View FIGURES 99–107 .

Differential diagnosis. Acylophorus mauritianus   sp. nov. differs from all hitherto known Afrotropical species by the combination of the very long and narrow head, the finely and sparsely micropunctured head and pronotum and by the shape of the aedeagus.

Etymology. The name of the new species is derived from the island Mauritius.

Distribution. Acylophorus mauritianus   sp. nov. is known so far only from Mt. Le Pouce in Mauritius.

Bionomics. All specimens were found by sifting in small indigenous forest far from any stream ( Fig. 170 View FIGURES 166–171. 166 ).