Stenotarsus raramuri, Arriaga-Varela, Emmanuel, Zaragoza-Caballero, Santiago, Tomaszewska, Wioletta & Navarrete-Heredia, Jose Luis, 2013

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 : 38-39

Stenotarsus raramuri sp. nov.

( Figs. 35 , 72 , 107 , 122 , 151 , 176 , 196 , 204 –205, 247 , 259 )

Diagnosis. This species forms a group with S. globosus , S. rubrocinctus , and S. shockleyi sp. nov., in sharing similar antennal structure ( Figs. 56 , 72, 75 ), genitalia of both sexes ( Figs. 204–205 ; 247), and the following features of the male: metaventrite with a concavity between mesocoxae ( Figs. 88–89 ), metatibia with a row of small tubercles on medial margin ( Figs. 145 , 160 , 177–178, 181 ), and metafemur with a tooth on medial margin near trochanter ( Figs. 150–153 ). Stenotarsus raramuri is distinguished from other members of this group by: larger size (6.9–7.9 mm), body uniformly ferruginous red except antennomeres 7–11 which are black ( Fig. 35 ), elytra with foveolate punctures comparatively large and deep ( Fig. 122 ), and metafemur of males with tooth widely truncate ( Fig. 151 ).

Description of males. Body 6.7–7.9 mm long, long oval, moderately convex ( Fig. 35 ), 1.80–1.83X as long as wide, 2.9–3.0X as long as high. Completely reddish brown, except antennomeres 7–11 which are black. Densely covered with golden setae.

Head: Clypeus transverse, 2.0X wider than long. Terminal labial palpomere narrow, acuminate, narrowly truncate apically. Interocular distance 0.63–0.65X as wide as head. Antenna moderately long and slender ( Fig. 72 ), 0.40X longer than body; scape 1.2X as long as wide, 1.6X longer than pedicel; pedicel as long as wide; third antennomere 1.4X as long as wide, 1.2X as long as pedicel; fourth 1.6X as long as wide, 1.4X as long as pedicel; fifth 2X as long as wide, 1.7X as long as pedicel; sixth 1.7X as long as wide, 1.6X as long as pedicel; seventh 1.3X as long as wide, 1.3X as long as pedicel; eighth subequal to seventh; antennal club,0.38X as long as the total antennal length, with segments almost symmetrical; ninth antennomere widened apically, 1.2X as long as wide at apical side, 2X as long as pedicel; tenth widened apically, 1.1X as long as wide, 1.9X as long as pedicel; terminal antennomere slightly asymmetrical, subrectangular, slightly widening apically, 1.4X as long as wide, 3X as long as pedicel.

Prothorax: Pronotum widest at base ( Fig. 107 ), transverse, 2.0X wider than long, 2.36X wider than head, 2.00– 2.05X wider at base than at front angles. Sides weakly convergent in posterior half, then weakly rounded to front angles. Front angles produced, right-angled or briefly acute, blunt at tip. Hind angles weakly acute. Anterior margin narrow, slightly arcuate medially. Lateral margins moderately raised, moderately wide, weakly narrowing posteriorly, more strongly close to base; width of margin at base1/4 of the distance between basal pore and hind angle; area between marginal line and pronotal edge weakly concave. Disc moderately convex finely and closely punctate; lateral sulci moderately deep, lacking anteriorly, short, weakly curved medially. Basal pores large, curved, oblique. Basal sulcus only impressed close to pores. Pronotal base lobed medially. Prosternal process narrow at base, widened posteriorly; scarcely narrower than longitudinal procoxal diameter apically.

Pterothorax: Scutellum triangular, moderately large, 1.50–1.75X wider than long, 0.18X as wide as pronotum. Elytra 4.9–5.3 mm long, 1.23X longer than wide, 3.53–3.62X longer and 1.45X wider than pronotum; ovoid, widest near basal third, then roundly converging to acuminate apex; moderately densely punctate ( Fig. 122 ) with foveolate punctures moderately large and rather deep, separated by 1.5–4.0 diameters, sparser and shallower apically. Humerus moderately prominent. Epipleura at base 0.8X as wide as the intercoxal process of metaventrite. Mesoventrite deeply excavated in front; mesoventral process as wide as longitudinal coxal diameter, without medial carinae; bearing small setose pores laterally. Metaventrite weakly convex, with transverse, more densely pubescent concavity on intercoxal process between mesocoxae; with pair of small setose pores of approximately same diameter posterior to each mesocoxa. Metepisternum with small setose pore.

Legs: long and slender ( Fig. 176 ). Trochanters simple. Meso- and metafemora rather slender, widest barely before midlength; mesofemur unarmed; metafemur slightly longer than mesofemur, bearing moderately long decumbent setae, with a widely truncate tooth on the base of medial margin ( Fig. 151 ). Meso- and metatibiae moderately slender; metatibia as long as metafemur, 0.37–0.39X as long as elytra, very weakly and gradually widened apically, slightly bent in apical third, with row of small tubercles on medial margin. Metatarsus 0.41X as long as metatibia; second tarsomere produced and lobed, 2.5X wider apically than fourth tarsomere at midlength.

Abdomen: ventrite I almost as long as metaventrite and slightly shorter than ventrites II–V combined, with sparse foveolate punctation posterior to metacoxae, without protuberances. Ventrite V scarcely longer than IV, with apex truncate. Ventrite VI rounded apically. Tergite VIII weakly truncate. Median lobe slender, curved, gradually narrowed with apical crest, in ventral view ( Fig. 205 ), widened apically, in lateral view ( Fig. 204 ). Tegmen with moderately large submembranous tegminal plate ( Fig. 196 ).

Description of females. Body 7.0– 7.5 mm long, 1.8X as long as wide, 2.70–2.77X as long as high. Antenna 0.38–0.39X longer than body. Pronotum 2.0–2.1X wider than long, 1.93–2.0X wider at base than at front angles, 2.38X as wide as head. Elytra 4.65–5.20 mm long, 1.16–1.23X longer than wide, 3.65–3.70X longer and 1.38– 1.45X wider than pronotum. Metaventrite without concavity or other modification on the anterior margin. Metafemur unarmed. Metatibia 0.30–0.33X as long as elytra; linear, unarmed, as long as metafemur. Metatarsus 0.55–0.60X as long as metatibia. Ovipositor with proctiger rounded, coxites wide, without styli ( Fig. 247 ).

Sexual dimorphism. Males have a concavity on the metaventrite, the metatibia with a row of small tubercles and the metafemur with a tooth. Females have proportionally larger elytra and shorter antennae and legs.

Variation. No significant variation was found.

Material examined. Types. Holotype (male): Canelas [h] / S. globosus Guérin ?, teneral, det. H.F. Strohecker (MNB); Paratypes: Canelas [h] (2 males, 1 female: MNB); same data plus / Stenotarsus sallaei v. (1 female: MNB); México, Jal., Mascota, El Atajo, carr. Mascota-Las Palmas, BMM, 1413 m, 20º38’01’’N, 104º51’45’’W, 6.VII.2005, ex Sirobasidium sanguineum (Tremellaceae) , J. Cortés-Aguilar (1 male: CZUG)

Distribution. MEXICO: Durango, Jalisco ( Fig. 259 ).

Biological Notes. Altitudinal range: 1360–1413 m. Habitat: cloud forest. Period of activity: July. Host fungi: Sirobasidium sanguineum ( Tremellales : Sirobasidiaceae ).

Etymology. This species is dedicated to the Raramuri (Tarahumara) people, who inhabit the Sierra Madre Occidental of México, the region where the holotype was collected.

Remarks. H.F. Strohecker studied the specimens from Durango and labeled them as probably teneral members of S. globosus . These specimens are, however, not teneral.

Figures

FIGURES 26 – 37. Habitus in dorsal view of Stenotarsus spp. Scale bar = 1 mm. 26 – 27) S. militaris; 28) S. molgorae; 29) S. monterrosoi; 30) S. nigricans; 31 – 32) S. oblongulus; 33) S. ovalis; 34) S. parallelicornis; 35) S. raramurii: 36) S. rubrocinctus; 37) S. rulfoi.

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 115 – 125. Surface of elytron of Stenotarsus spp. 115) S. cortesi; 116) S. exiguus; 117) S. globosus; 118) S. kafkai; 119) S. lemniscatus; 120) S. ovalis; 121) S. militaris; 122) S. raramuri; 123) S. rulfoi; 124) S. shockleyi; 125) S. spiropenis.

FIGURES 144 – 157. Structure of hind legs of Stenotarsus spp. 144 – 149 Hind leg. 150 – 153. Base of male metafemur. 154 – 157. Metatarsus. 144) S. exiguus; 145) S. globosus; 146) S. latipes; 147) S. nigricans; 148) S. spiropenis; 149) S. ovalis; 150) S. globosus; 151) S. raramuri; 152) S. rubrocinctus; 153) S. shockleyi; 154) S. globosus; 155) S. incisus; 156) S. spiropenis; 157) S. oblongulus.

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 196 – 199. Aedeagus of Stenotarsus spp. 196) S. globosus, S. raramuri, S. rubrocinctus, S. shockleyi; 197) S. militaris; 198) S. oblongulus; 199) S. spiropenis.

FIGURES 200 – 223. Lateral and ventral view of median lobe of edeagus of Stenotarsus spp. 200 – 201) S. cortesi; 202 – 203) S. exiguus; 204 – 205) S. globosus, S. raramuri, S. rubrocinctus, S. shockleyi; 206 – 207) S. guatemalae; 208 – 209) S. incisus; 210 – 211) S. kafkai, S. mexicanus; 212 – 213) S. latipes; 214 – 215) S. lemniscatus; 216 – 217) S. marginalis; 218 – 219) S. mesoamericanus; 220 – 221) S. militaris; 222 – 223) S. molgorae.

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 257 – 259. Distributional maps of Stenotarsus spp. 257) S. cortesi (C), S. mesoamericanus (S), S. parallelicornis (T); 258) S. exiguus (C), S. incisus (S); 259) S. globosus (C), S. rubrocinctus (S), S. raramuri. (T). Yellow circles (C), red squares (S), blue triangles.

FIGURES 54 – 71. Right antennae of Stenotarsus spp. 54) S. cortesi; 55) S. exiguus; 56) S. globosus, S. rubrocinctus; 57) S. guatemalae; 58) S. incisus; 59) S. kafkai; 60) S. latipes; 61) S. lemniscatus; 62) S. marginalis; 63) S. mesoamericanus; 64) S. mexicanus; 65) S. militaris; 66) S. molgorae; 67) S. monterrosoi; 68) S. nigricans; 69) S. oblongulus; 70) S. ovalis; 71) S. parallelicornis.

FIGURES 79 – 89. 79 – 83. Pronotum of Stenotarsus spp. 84 – 89. Intercoxal process of male metaventrite of Stenotarsus spp. 79) S. marginalis; 80) S. mexicanus; 81) S. oblongulus; 82) S. o valis; 83) S. spiropenis; 84) S. incisus; 85) S. monterrosoi; 86) S. oblongulus; 87) S. ovalis; 88) S. rubrocinctus; 89) S. shockleyi.

FIGURES 158 – 173. Hind legs of male Stenotarsus spp. 158) S. cortesi; 159) S. exiguus; 160) S. globosus; 161) S. guatemalae; 162) S. incisus; 163) S. kafkai; 164) S. latipes; 165) S. lemniscatus; 166) S. marginalis; 167) S. mesoamericanus; 168) S. mexicanus; 169) S. militaris; 170) S. molgorae; 171) S. monterrosoi; 172) S. nigricans; 173) S. oblongulus.