Acylophorus tristis Jarrige, 1965

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 : 153-157

publication ID	https://doi.org/ 10.11646/zootaxa.4462.2.1
publication LSID	lsid:zoobank.org:pub:FA92FB55-EA2E-4193-946E-F780A16EB3CC
DOI	https://doi.org/10.5281/zenodo.5960283
persistent identifier	https://treatment.plazi.org/id/03DD5963-FFF7-FFDA-FF7A-FABAFABBEEE2
treatment provided by	Plazi
scientific name	Acylophorus tristis Jarrige, 1965
status

Treatment

Acylophorus tristis Jarrige, 1965 View in CoL

( Figs. 1–21 View FIGURES 1–8 View FIGURES 9–17 View FIGURES 18–21 , 166, 167 View FIGURES 166–171. 166 , 172 View FIGURES 172–177 )

Acylophorus tristis Jarrige, 1965: 140 View in CoL ; Herman, 2001: 3038.

Type locality. Madagascar, Tananarive [Antananarivo], ca. 18 54' S, 47 31' E. GoogleMaps

Type material examined. Holotype ♂: MADAGASCAR: “Tananarive, Mdg., Dr Ch. Nodier”, “ TYPE ”, “ A. tristis Jarrige ” ( MHNP).

Additional material examined. MADAGASCAR: 2 ♂, 1 ♀: C Madagascar, Antananarivo: Fenomanana , 1250–1350 m , 20.3.2001, swamp, treading, J. Janák ( JJRC); 1 ♀: C Madagascar, Antananarivo: Fenomanana , 1250–1350 m , 26.1.2004, swamp, treading, 18° 55' S, 47° 32' E, J. Janák ( JJRC); 1 ♀: C Madagascar, Antananarivo GoogleMaps , 1.IV.06, sifted litter, G. de Rougemont lgt. ( GROG); 2 ♀: Madagascar Est, Andasibé ( Périnet ), 900– 1000 m, 6. – 7.2.1993, J. Janák lgt. ( JJRC); 1 ♀: E Madagascar, 32 km ESE of Betroka, Vohitrosa forest , 0.5 km S of ▲ 1798 m, 1650–1700 m, 25. – 28.12.1998, meadow, lighted swamp, treading, J. Janák ( JJRC); 1 ♀: 30 km SE of Betroka, 3 km NE of Tsanerena , 900 m , 15.12.1998, Ivahona, river alluvions, J. Janák lgt. ( JJRC); 3 ♂, 1 ♀: Sendrisoa , S of Ambalavao, Manambolo riv., 1200 m , 19.4.2001, treading on river bank, J. Janák ( JJRC); 13 ♂, 10 ♀: SE Madagascar: 21 km NE of Esira, Col de Marotaolana , 1100–1200 m, 1. – 2.2.2004, 24° 14' S, 46° 53' E, swamp, treading, J. Janák lgt. ( JJRC); 1 ♂: Madagascar Ouest, Manindray, E of Sakahara , 700–800 m GoogleMaps , 30.1.1995, bord d’un ruisseau [brook bank], Pandanus, bambous, J. Janák lgt. (JJRC).

Redescription (n=10). Body length 6.9–8.7 mm (M= 7.9 mm, HT= 7.8 mm), forebody length 3.2–4.0 mm (M= 3.7 mm, HT= 3.7 mm) ( Fig. 1 View FIGURES 1–8 ). Body black, abdominal tergites at most slightly iridescent; antennae brownish black with base of first two segments and segments 3–4 reddish; legs reddish brown, tarsi and maxillary palpi reddish.

Head rounded triangular ( Fig. 2 View FIGURES 1–8 ), about as long as wide (L/W=0.98–1.02, M=1.00, HT=0.98), markedly widened behind eyes, with two pairs of interocular setae. Temples markedly shorter than eyes (R=0.45–0.54, M=0.49, HT=0.54). Dorsal side of head with dense and fine micropunctures ( Fig. 3 View FIGURES 1–8 ). Dense pale grey pubescence behind eyes. Three postocular setae visible on each side, additional seta on hind margin of eye absent. Mandibles with two sharp teeth ( Fig. 4 View FIGURES 1–8 ). Maxillary palpi with terminal segment relativelly narrow, pubescent, asymmetric, wider and markedly longer than glabrous penultimate segment which is triangular ( Fig. 5 View FIGURES 1–8 ). First segment of antenna nearly as long as next four; segments 1 to 6 elongate, segment 5 markedly longer than wide (R=1.21–1.64, M=1.43, HT=1.43), segments 7–8 about as long as wide, segment 9 markedly transverse, segment 10 markedly transverse (R=0.57–0.70, M=0.63, HT=0.65).

Pronotum slightly transverse (R=1.08–1.16, M=1.12, HT=1.08) markedly widened behind with sides slightly rounded, widest in basal half ( Fig. 2 View FIGURES 1–8 ), shining, with micropunctures slightly finer and sparser than those on head. One pair of dorsal setae and one pair of lateral setae. Marginal setae short. Elytra transverse (R=1.43–1.51, M=1.47, HT=1.43) with short, pale, but not shining pubescence arising from dense aspirate punctures. Apical fringe of bristles slightly longer than pubescence on other parts of the elytra. Abdominal tergites with short, moderately dense pubescence arising from aspirate punctures finer and sparser than on elytra.

Meso- and metatarsi with long empodial setae ( Figs. 9, 10 View FIGURES 9–17 ).

Male (n=6). Sternite 9 long and narrow ( Fig. 19 View FIGURES 18–21 ), apex of tergite 10 rounded with very long apical setae ( Fig. 18 View FIGURES 18–21 ). Aedeagus ( Figs. 6–8 View FIGURES 1–8 , 11–17 View FIGURES 9–17 ) 0.91–0.97 mm long (M= 0.93 mm, HT= 0.92 mm). Parameres bilobed, lobes widely separated, sensory pegs confusedly arranged right at apex ( Fig 17 View FIGURES 9–17 ). Median lobe of aedeagus markedly overreaching paramere, apex broadly rounded ( Figs. 8 View FIGURES 1–8 , 13–15, 17 View FIGURES 9–17 ).

Female. Tergite 10 with apicolateral emarginations, sharply pointed ( Fig. 20 View FIGURES 18–21 ), valves as in Fig. 21 View FIGURES 18–21 .

Differential diagnosis. Acylophorus tristis differs from all hirtherto known Afrotropical species of A. densipennis group by the median lobe markedly overreaching the paramere, and by widely separated lobes of the paramere.

Distribution. The species is distributed in East, Central, South-East and West-Madagascar ( Fig. 172 View FIGURES 172–177 ).

Bionomics. Most specimens were found by treading of vegetation on stream banks and ponds in vegetation partly immersed in water (e.g. Figs. 166 View FIGURES 166–171. 166 ) or in a marsh ( Fig. 167 View FIGURES 166–171. 166 ). A teneral specimen was found in March.