Dinothenarus amisadaiae, 2008

Santiago-Jiménez, Quiyari J., 2008, A new species of Dinothenarus (Coleoptera: Staphylinidae) from Mexico, Zootaxa 1851, pp. 51-57 : 52-55

Dinothenarus (s. str.) amisadaiae Santiago-Jiménez , sp. n.

( Figs. 1–4 )

Type material. Holotype: male, MÉXICO: Veracruz: Cofre de Perote, Xico, Tembladeras, 3000 m, 19º30’55”N 97º06’55”W, Pinus forest, ex. pit - fall baited with cow dung, 9.II–9.IV.2005, D. Martínez y Q. Santiago cols ( IEXA).

Paratypes (5ɗɗ, 5ΨΨ): MÉXICO: Veracruz: 2ɗɗ, same as holotype ( IEXA, CZUG); Ψ, same data except for: 07.IV–9.V.2000, E. Montes de Oca & Q. Santiago cols. ( CZUG); ɗ, same data except for: 13.XII.2000 – 19.I.2001 (CC-UAEH); Ψ, same data except for: 31.V–18.VI.2001 (CC-UAEH); ɗ, same data except for: ex. pit - fall, 08.III–07.IV.2000 ( FMNH); Ψ, same data except for: 3100 m, 19º30’31”N 97º07’00”W, ex. pit-fall baited with cow dung, 11.II–08.III.2000 ( FMNH); Ψ (in ethanol), same data except for: 07.IV–09.V.2000 ( FMNH); ɗ, same data except for: 12.III–19.IV.2001 ( IEXA); Ψ, same data except for: 3200 m, 19º30’04”N 97º07’31”W, 2–30.VI.2000 ( IEXA).

Diagnosis. Dinothenarus amisadaiae is similar to D. capitatus in color pattern; however, D. amisadaiae is easily recognized because its pronotum is mostly black; humerus without a lateral fulvous mark; abdomen entirely black; abdominal sternite III not extensively covered by silvery tomentose pubescence; and primarily by differences in the aedeagus ( Figs. 2–4 ), which in D. capitatus is shorter, with paramere mostly asymmetrical and obtusely truncate dextro-apically ( Figs. 5–6 ).

Description. Length 14.5–16.8 mm, measured from front of head to apex of last abdominal segment along midline. Black, except dorsal and most of ventral surface of head, dorsal surface of neck, and labrum testaceous; maxillary and labial palpi rufo-testaceous to piceous; mandibles each testaceous, becoming piceous toward apex and inner margin; color pattern of antennae variable, but generally antennomeres 1–2 testaceous, 3–4 testaceous or rufo-testaceous to piceous, 5–10 segments becoming darker with basis testaceous, and 11 sometimes rufo-testaceous; legs black, some specimens with apical margin of femur slightly reddish; each leg with tarsomeres 1–4 rufo-piceous dorsally, and tarsomere 5 with claws rufo-testaceous.

Head rounded rectangular in shape, wider than long, slightly wider than pronotum, subparallel behind eyes, hind angles broadly rounded; most of head testaceous, with two minute black spots between eyes, in some specimens with an irregular darkened area between these spots; pubescence golden-yellow; macrosetae on vertex arising from black alveoli ( Fig. 1 ); eyes small, slightly convex, tempora each as long as length of eye seen from above; dorsum of head with punctation dense and fine, less dense on ventral surface, diameters of punctures about twice the diameter of facets of eye. Antennae about 1.7 times as long as head, segment 2 slightly shorter than segment 3, segment 4 slightly longer than wide, segments 5–10 becoming wider apicad, segment 11 asymmetrical; segments 5–11 with dense microsetae. First segment of maxillary palpi very small; second segment longer than remaining ones; apical segment narrower, subequal in length to penultimate segment, fusiform, and asetose. Ligula with slight incision apically. First and third segments of labial palpi subequal in length; last segment longer than penultimate segment, and with few fine setae. Mandibles subequal in length to head along midline, with a minute subbasal tooth on each mandible. Left mandible with two teeth in dorsal position; right mandible with only one big tooth in dorsal position.

Pronotum about as long as wide, narrowed posteriorly; black with slight metallic lustre, in some specimens anterior and posterior margins slightly reddish; punctation similar to that of head, but becoming coarser on pronotal disc; with a narrow, elongate, glabrous, impunctate medial area on basal fourth of pronotum; pubescence piceous and golden-yellow, with one patch of golden - yellow pubescence more or less defined on pronotal disc on each side of midline, and another smaller and less defined patch behind these, near posterior margin; one female with two deep impressions between anterior and posterior patch of golden-yellow setae on pronotal disc. Scutellum with two patches of black velvety setae separated from each other by a poorly defined glabrous midline, both patches surrounded by golden-yellow setae. Metaventrite extensively covered by silvery tomentose pubescence. Elytra shorter at suture than pronotum at midline (ratio 0.78), and at sides longer than that (ratio 1.30), at base wider than pronotal base, somewhat widened posteriorly; black with slight metallic lustre, with humerus slightly reddish; punctation fine, dense, granulose, with intermixed, large and shallow pit-like impressions. Tibiae with spines, denser on mesotibiae. First four tarsomeres of protarsus strongly dilated, sub-bilobed, each densely covered with modified setae ventrally; tarsomere 2 wider than tarsomere 1; tarsomere 4 distinctly less dilated than preceding tarsomeres.

Abdomen black with slight metallic lustre; posterior basal line of tergites III–VII biangulate, on tergite VII not well defined; punctation very fine, sparse; surface between punctures covered by dense, irregular microsculpture; pubescence of tergites III–V piceous, variegated with golden-yellow setae, each tergite medio-basally with bifariate, black tomentose spot; tergite III with patch of golden-yellow setae on midline well defined or not; tergites VI–VII extensively covered by silvery tomentose pubescence missing from each latero-basal corner, and extended onto laterotergites. Abdominal sternites IV–VII or VIII extensively covered by silvery tomentose pubescence, less notable on sternite III.

Male sternite VIII with a deep, obtusely triangular medio-apical emargination. Genital segment of male with tergite IX wide, strongly narrowed toward irregularly arcuate apex, with numerous fine and stronger setae in apical region; male sternite IX slightly narrower than tergite IX, emarginate in “V” shape apically, more densely setose at apical margin.

Female sternite VIII not emarginate. Female tergite IX wide, strongly narrowed toward irregular truncate apex. Genital segment of female with second gonocoxite with minute stylus bearing three long apical setae, one of them slightly shorter, basal half without long, dark setae.

Aedeagus moderately long; median lobe narrowed into large and long, subacute apex; paramere slightly asymmetrical, not reaching base of apex of median lobe, sides more or less parallel although left side is slightly longer ( Fig. 2 ); sensory peg setae on underside of paramere forming more or less regular group in “V” shape near apex of paramere, with some setae of variable size at margins and underside of apical portion of paramere ( Figs. 2 and 4 ); internal sac with small spinules and with spines ( Fig. 3 ).

Distribution. Known only from the type locality: Cofre de Perote, Veracruz, México ( Fig. 7 ). Natural History. Specimens of D. amisadaiae have been found in pit-fall traps baited with cow dung, and one specimen was found in a pit-fall trap without bait. Specimens were collected in small patches of Pinus forest, surrounded by potato crop fields and pastures, between January and June.

Etymology. This species is dedicated to my daughter Amisadaí for the happiness that she has given to me in recent years.

Figures

FIGURES 1. Habitus of Dinothenarus amisadaiae Santiago-Jiménez, sp. nov. Scale bar 2 mm.

FIGURES 2 – 6. Details of Dinothenarus amisadaiae Santiago-Jiménez, sp. nov. (2 – 4) and D. capitatus (Bland) (5 – 6). 2, 5 — aedeagus in dorsal view showing the paramere with peg setae (visible by translucence); 3, 6 — aedeagus in lateral view (3: showing spines of the internal sac); 4 — paramere in ventral view showing the peg setae. Scale bar 1 mm (2 – 3, 5 – 6), 0.2 mm (4).

FIGURE 7. Geographical distribution of American species of Dinothenarus (s. str.): D. amisadaiae Santiago-Jiménez, sp. nov. (circle), and D. capitatus (Bland) (triangle).