Stenotarsus sallaei Gorham

Arriaga-Varela, Emmanuel, Zaragoza-Caballero, Santiago, Tomaszewska, Wioletta & Navarrete-Heredia, Jose Luis, 2013, Preliminary review of the genus Stenotarsus Perty (Coleoptera: Endomychidae) from México, Guatemala and Belize, with descriptions of twelve new species, Zootaxa 3645 (1), pp. 1-79 : 42-44

Stenotarsus sallaei Gorham

( Figs. 38 , 74 , 110 , 179 , 186 , 236 –237; 255, 267)

Stenotarsus sallaei Gorham, 1873: 63 ; Gorham 1890: 140; Arrow 1920: 51; Blackwelder 1945: 440; Strohecker 1953: 56; Arriaga-Varela et al. 2007: 15; Shockley et al. 2009a: 85.

Stenotarsus distinguendus Arrow, 1920: 51 ; Blackwelder 1945: 439; Strohecker 1953: 56; Shockley et al. 2009a: 81. New synonym.

Diagnosis. Stenotarsus sallaei resembles S. guatemalae and brown specimens of S. oblongulus Gorham in the rather oblong body, and pronotum with small and weakly elongate foveae ( Figs. 93, 104 , 110 ). It is distinguished from these species by the following combination of characters: terminal antennomere gradually widened apically, without protuberances on lateral margin ( Fig. 74 ), metatibia almost parallel along basal half, widened at medial margin at apical 3/4 ( Fig. 179 ), males with abdominal ventrite I bearing a small, blunt, conical protuberance at center, near posterior margin ( Fig. 186 ). Median lobe very narrow, in ventral view ( Fig. 237 ), widened and flattened apically, in lateral view ( Fig. 236 ).

Description of males. Body 4.60–4.75 mm long, long oval ( Fig. 38 ), weakly convex, 1.83–1.85X as long as wide, 2.83–2.89X as long as high. Uniformly brown except antennomeres 7–11 which are black, antennomere 6 may be infuscate. Densely covered with long, suberect, light coppery to golden setae.

Head: Clypeus transverse, 2.2X wider than long. Terminal labial palpomere narrow, acuminate, narrowly truncate apically. Interocular distance 0.63–0.64X as wide as head. Antenna comparatively long and slender ( Fig. 74 ), 0.45–0.47X as long as body; scape 1.7X as long as wide, 1.4X longer than pedicel; pedicel 1.4X longer than wide; third antennomere 1.4X as long as wide, as long as pedicel; fourth 1.6X as long as wide, 1.1X as long as pedicel; fifth 1.9X as long as wide, 1.3X as long as pedicel; sixth and seventh subequal to fifth; eighth 1.4X as long as wide, 1.2X longer than pedicel; antennal club 0.38X as long as total antennal length, with segments almost symmetrical; ninth antennomere weakly widened apically, 1.1X as long as wide, 1.6X as long as pedicel; tenth slightly asymmetrical, widened apically, 0.9X as long as wide, 1.3X as long as pedicel; terminal antennomere almost symmetrical, gradually widened apically, 1.7X as long as wide, 2.9X as long as pedicel.

Prothorax: Pronotum widest at base, transverse ( Fig. 110 ), 2.0–2.1X wider than long, 1.78–1.90X wider at base than at front angles, 2.1–2.2X wider than head. Sides weakly rounded, converging to front angles. Front angles produced, briefly obtuse and rounded at tip. Hind angles briefly obtuse. Anterior margin narrow, not distinctly arcuate medially. Lateral margins weakly raised, weakly narrowing posteriorly; width of margin at base almost 1/4 of the distance between basal pore and hind angle; area between marginal line and pronotal flat. Disc moderately convex, finely and closely punctate. Longitudinal sulci moderately deep, short, narrowing anteriorly, slightly convergent. Basal pores small, rounded or slightly elongated. Basal sulcus absent. Pronotal base lobed medially. Prosternal process wide at base, slightly widened posteriorly; as wide as longitudinal procoxal diameter apically.

Pterothorax: Scutellum triangular, moderately large, 2.2–2.4X wider than long, 0.18–0.19X as wide as pronotum. Elytra 3.4–3.6 mm long, 1.11–1.16X longer than wide, 3.25–3.32X longer and 1.28–1.30X wider than pronotum; long ovoid, widest at basal third, then roundly convergent to the moderately acuminate apex. Densely punctate with foveolate punctures moderately large and deep, separated by 2.5–4.5 diameters, sparser and shallower apically and near scutellum. Humerus moderately prominent. Epipleuron moderately wide at base, 0.8X as wide as the intercoxal process of metaventrite. Mesoventrite deeply excavated in front; bearing small setose pores laterally; mesoventral process slightly wider than longitudinal coxal diameter, without medial carinae. Metaventrite moderately convex, without modifications on anterior margin; with pair of small setose pores of approximately same diameter posterior to each mesocoxa. Metepisternum with small setose pore.

Legs: moderately long and slender ( Fig. 179 ). Trochanters simple. Meso- and metafemora moderately widened at midlength, unarmed; metafemuras long as mesofemur, bearing moderately long decumbent setae. Meso- and metatibiae moderately slender; metatibia as long as metafemur, 0.33–0.34X as long as elytra, parallel in basal half, widened at apical third, slightly curved, unarmed. Metatarsus 0.57–0.60X as long as metatibia; second tarsomere produced and lobed, 2.0X as wide apically as fourth tarsomere at midlength.

Abdomen: ventrite I slightly shorter than metaventrite and that ventrites II–V combined, with moderately coarse foveolate punctation, bearing a conical protuberance, rounded at tip, at midline near posterior margin ( Fig. 186 ). Ventrite Vlonger than IV, with apex truncate. Ventrite VI rounded apically. Tergite VIII truncate. Median lobe very slender, curved, in ventral view ( Fig. 237 ); flat and broadened apically, in lateral view ( Fig. 236 ). Tegmen with moderately large submembranous tegminal plate.

Description of females. Body 4.4–5.0 mm long, 1.75–1.84X as long as wide, 2.79–2.86X as long as high. Antenna 0.42–0.43X as long as body. Pronotum 2.13–2.20X wider than long, 1.91–1.95X wider at base than at front angles, 2.25–2.30X wider than head. Elytra 3.10–3.33 mm long, 1.13–1.20X longer than wide, 3.32–3.43X longer and 1.33–1.39X wider than pronotum. Metatibia 0.29–0.32X as long as elytra, parallel in basal half, then weakly widened at 3/4, very scarcely curved, Metatarsus 0.49–0.54X as long as metatibia. Ventrite I without protuberances. Ovipositor with proctiger distinctly acuminate, pointed apically, coxites wide, without terminal styli ( Fig. 255 ).

Sexual dimorphism. Females have proportionally less elongate antennae and longer, broader elytra. The metatibiae are slightly less widened at apical fourth, and abdominal ventrite I lacks the conical protuberance.

Material examined. Types. Lectotype of Stenotarsus sallaei Gorham (present designation) (female): Syntype [round, blue bordered label] / Mexico, Salle Coll. / Toxpam / 2198 / B.C.A., VII, Stenotarsus [p] sallaei Gorh. [h] (NHM); Paralectotype (female): Syntype [round, blue bordered label] / Type H. T. [round, red bordered label] / S. sallaei Gorham type / Gorham 91–50 / type Guérin Men. / Stenotarsus sallaei Gor. (type) Tuxpam, Mexique (NHM); Lectotype of Stenotarsus distinguendus Arrow (present designation) (male): Syntype [round, blue bordered label] / Type H. T. [round, red bordered label] / Sabo, Vera Paz, Champion / Stenotarsus distinguendus , type, Arrow / B.C.A., VII, Stenotarsus [p] sallaei Gorh. [h] (NHM).

Other Material: México: Los Tuxtlas, Estado de Veracruz, Estación Biológica, 13-VIII-1985, M. L. Castillo, col. (1 male, 1 female: CNIN); 211 / Stenotarsus sallaei Guer. Tuxpam (1 male: MNHN); 21862 / sallaei Guer. (sec. Deyrolle), Mexico Deyr. / Hist. –Coll. ( Coleoptera ) Nr. 21862, Stenotarsus sallaei Guér. México, Deyrolle, Zool. Mus. Berlin / Stenotarsus sallaei Gorh. (female) det. H.F. Strohecker, from study of syntypes (1 female: MNB); Hist.–Coll. ( Coleoptera ) Nr. 21862, Stenotarsus sallaei Guér. México, Deyrolle, Zool. Mus. Berlin (1 male: MNB); México: Veracruz, Zongolica, Ixcohuapa. 18o40’40.3’’ N, 96o59’06.6’’ W. 1040 m. Cafetal-BMM ( Alnus sp.). En tronco con hongo resupinado. 6.X.2011. Col. E. Arriaga-Varela (1 male: CZUG).

Distribution. GUATEMALA: Baja Verapaz; MEXICO: Veracruz ( Fig. 267 ).

Biological Notes. Period of collecting: August.

Remarks. The characters proposed by Arrow (1920) to differentiate S. distinguendus from S. sallaei were: elytra more finely and closely punctate, and narrower and less rounded pronotal margins in S. distinguendus . These were not corroborated through the study of material. Hence, S. distinguendus is synonymized here under S. sallaei . The protuberance on abdominal ventrite I in males is peculiar and has not been reported for other Stenotarsus species.

Figures

FIGURES 38 – 42. Habitus in dorsal view of Stenotarsus spp. Scale bar = 1 mm .. 38) S. sallaei; 39) S. shockleyi; 40) S. smithi; 41) S. spiropenis: 42) S. thoracicus.

FIGURES 72 – 78. Right antennae of Stenotarsus spp. 72) S. raramuri; 73) S. rulfoi; 74) S. sallaei; 75) S. shockleyi; 76) S. smithi; 77) S. spiropenis; 78) S. thoracicus.

FIGURES 105 – 114. Pronotum of Stenotarsus spp. 105) S. ovalis; 106) S. parallelicornis; 107) S. raramuri; 108) S. rubrocinctus; 109). S. rulfoi; 110) S. sallaei; 111) S. shockleyi; 112) S. smithi; 113) S. spiropenis; 114) S. thoracicus.

FIGURES 174 – 185. 174 – 183. Hind legs of male Stenotarsus spp. 184 – 185. Hind legs of female Stenotarsus spp. 174) S. ovalis; 175) S. parallelicornis; 176) S. raramuri; 177) S. rubrocinctus; 178) S. rulfoi; 179) S. sallaei; 180) S. shockleyi; 181) S. smithi; 182) S. spiropenis; 183) S. thoracicus; 184) S. exiguus; 185) S. globosus.

FIGURES 186 – 195. Abdmonal structures of Stenotarsus spp. 186. Lateral view of abdomen of male S. sallaei. 187 – 191. Abdomen of female Stenotarsus spp. 192 – 195. Tergite VIII of female Stenotarsus spp. 187) S. globosus; 188) S. incisus; 189) S. militaris; 190) S. monterrosoi; 191) S. nigricans; 192) S. lemniscatus; 193) S. monterrosoi; 194) S. militaris; 195) S. nigricans.

FIGURES 224 – 243. Lateral and ventral view of median lobe of edeagus of Stenotarsus spp. 224 – 225) S. monterrosoi; 226 – 227) S. nigricans; 228 – 229) S. oblongulus; 230 – 231) S. ovalis; 232 – 233) S. parallelicornis; 234 – 235) S. rulfoi; 236 – 237) S. sallaei; 238 – 239) S. smithi; 240 – 241) S. spiropenis; 242 – 243) S. thoracicus.

FIGURES 90 – 104. Pronotum of Stenotarsus spp. 90) S. cortesi; 91) S. exiguus; 92) S. globosus; 93) S. guatemalae; 94) S. incisus; 95) S. kafkai; 96) S. latipes, S. molgorae; 97) S. lemniscatus; 98) S. marginalis; 99) S. mesoamericanus; 100) S. mexicanus; 101) S. militaris; 102) S. monterrosoi; 103) S. nigricans; 104) S. oblongulus.

FIGURES 244 – 256. Female genitalia structures of Stenotarsus spp. 244) Ovipositor with spermatheca and accessory gland of S. spiropenis, dorsal. 245 – 256. terminal part of ovipositor, dorsal. 245) S. cortesi; 246) S. exiguus; 247) S. globosus, S. raramuri, S. rubrocinctus, S. shockleyi; 248) S. incisus; 249) S. latipes; 250) S. mesoamericanus; 251) S. mexicanus; 252) S. monterrosoi; 253. S. nigricans. 254. S. ovalis. 255. S. sallaei. 256. S. thoracicus.

FIGURES 266 – 267. Distributional maps of Stenotarsus spp. 266) S. oblongulus (C), S. spiropenis (S), S. rulfoi (T); 267) S. sallaei (C). Yellow circles (C), red squares (S), blue triangles (T)