Apecholinus canifer, Smetana & Hu, 2019

Smetana, Aleš & Hu, Fang-Shuo, 2019, The genera Agelosus Sharp, 1889 and Apecholinus Bernhauer, 1933 in Taiwan (Coleoptera: Staphylinidae: Staphylinini: Staphylinina), Zootaxa 4638 (3), pp. 379-388 : 384-387

Apecholinus canifer sp. nov.

( Figs 15–18 , 22 )

Type locality. TAIWAN: Nantou, Huisun Forest Area .

Type material. Holotype, male: “order Coleoptera Nantou, Huisun Forest Area [in Chinese ] Pitfall Trap G 2 1998 (y) 4. 24 4938” (in NCHU) . Paratype: “order Coleoptera Nantou, Huisun Forest Area [in Chinese ] Pitfall Trap H 1 1998 (y) 4. 24 4670”, 1 ♂ ( CNC) .

Diagnosis. This species differs from all remaining congeners by the body with the spots of grey tomentose pubescence.

Description. Pitchy black with black head, abdomen becoming paler toward apex; pubescence dark brownish, but each elytron with more or less triangular patch of grey tomentose pubescence below humerus; and abdominal tergites 6 and 7 each with a basal spot of grey tomentose pubescence; maxillary and labial palpi dark brown; antennae testaceous, with one to three basal segments darkened; legs dark brown to piceous, with front tarsi usually paler. Head of rounded quadrangular shape with rounded posterior angles, wider than long (ratio 1.24), eyes small, moderately convex, slightly shifted dorsad, tempora much longer than length of eyes seen from above (ratio 1.75); disc of head finely and densely punctate, punctation becoming gradually finer and denser posteriad and posteriolaterad and sparser toward clypeus; rudimentary linear impunctate midline apparent on vertex; interspaces between punctures without microsculpture. Antennae moderately long, hardly thickened toward apex, segment 3 longer than segment 2 (ratio 1.23, segments 4–9 longer than wide, gradually becoming shorter, segment 10 about as long as wide, last segment small, asymmetrically emarginated, along lateral margin shorter than penultimate segment. Neck densely and finely punctate. Pronotum about as long as wide, moderately convex, narrow marginal groove disappearing downwards at about anterior third of pronotal length; punctation on disc about the same as that on disc of head, interspaces between punctures without microsculpture; fine impunctate line present. Prescutum punctate-setose, interspaces with distinct microsculpture of transverse and oblique striae. Scutellum densely punctate-setose, with granulose microsculpture. Elytra moderately long, hardly dilated posteriad, at suture shorter than pronotum at midline (ratio 0.75), at sides as long as pronotum at midline; punctation very fine and very dense, interspaces between punctures with fine microscopic irregularities, elytra therefore appearing slightly dull. Wings folded under the elytra, but probably non-functional. Abdomen with fifth visible tergite without pale apical seam of palisade setae; tergite 2 (in front of first fully visible tergite) moderately densely punctate-setose, surface with extremely fine, superficial microsculpture of mostly oblique striae; punctation of all tergites finer and denser than that on elytra, punctation becoming gradually somewhat sparser toward apex of abdomen, interspaces with extremely fine, granulose microsculpture.

Male. Sternite 8 with shallow, obtuse medioapical sinuation. Genital segment with tergite 10 narrow, markedly, evenly narrowed toward subacute apex, apical portion with moderately long setae at apex, rest of tergite setose as in Fig.15 ; sternite 9 long and narrow, with minute basal portion, apical portion with very deep and narrow medioapical emargination, no differentiated setae at each edge of emargination ( Fig. 16 ). Aedoeagus (Figs 17,18) rather small, median lobe parallel-sided, with subtruncate apex; paramere narrow, situated on median lobe quite asymmetrically toward left margin of median lobe, with asymmetrical, subacute apex, markedly not reaching apex of median lobe, with two rather short and four minute apical setae; underside with numerous sensory peg setae arranged as in Fig. 18 .

Figures

FIGURES 8–15. 8–10. Apecholinus fraternus: 8, aedoeagus, parameral view; 9, apical portion of underside of paramere with sensory peg setae; 10, tergite 10 of female genital segment. Apecholinus imitator: 11, tergite 10 of male genital segment; 12, sternite 9 of male genital segment; 13, aedoeagus, parameral view; 14, apical portion of underside of paramere with sensory peg setae. Apecholinus canifer: 15, tergite 10 of male genital segment.

FIGURES 16–18. Apecholinus canifer: 16, sternite 9 of male genital segment; 17, aedoeagus, parameral view; 18, underside of apical portion of paramere with sensory peg setae.

FIGURES 19–24. 19: Agelosus auricomus: holotype, length 21 mm. 20: Apecholinus fraternus, length 20.0 mm. 21: Apecholinus imitator, holotype, length 22.0 mm. 22: Apecholinus canifer: paratype, length 20.0 mm. 23: Agelosus auricomus, right mandible. 24: Apecholinus fraternus, left mandible.