Stenotarsus spiropenis, 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 : 46-48

Stenotarsus spiropenis sp. nov.

( Figs. 8 , 41 , 53 , 77 , 83 , 113 , 125 , 132, 136, 138, 140, 143 , 182 , 199 , 240 –241, 244 , 266 )

Diagnosis. It is most similar to Stenotarsus rulfoi sp. nov. sharing the widely truncate terminal labial palpomere ( Fig. 8 ), pronotum with long longitudinal sulci ( Figs. 109, 113 ), elytra with foveolate punctures arranged in longitudinal striae ( Figs. 123, 125 ), mesoventral process with subtriangular figures ( Fig. 138 ), and median lobe coiled. Stenotarsus spiropenis can be differentiated from S. rulfoi by having wider longitudinal sulci on pronotum ( Fig. 113 ), larger foveolate punctures on anterior half of elytra (their diameter larger than 3X than diameter of the setiferous punctures) ( Fig. 125 ), and the antennae black with first three or four antennomeres ferruginous red or infuscate.

Description of males. Body: 4.9–5.2 mm long, long oval ( Fig. 41 ), moderately convex; 1.81–1.85X as long as wide, 2.65–2.88X as long as high. Uniformly ferruginous red, except antennomeres 5–11 which are black, articles 3– 4 may be gradually infuscate. Densely covered with long, suberect, coppery setae.

Head: Clypeus transverse, 2.2X wider than long. Terminal labial palpomere broad, widely truncate apically ( Fig. 86 ). Interocular distance 0.66–0.67X as wide as head. Antenna moderately long and rather stout ( Fig. 77 ) 0.40X as long as scape 1.3X as long as wide, 1.3X longer than pedicel; pedicel 1.1X longer than wide; third antennomere 1.5X as long as wide, 1.3X as long as pedicel; fourth 1.4X as long as wide, 1.2X as long as pedicel; fifth 1.3X as long as wide, 1.2X as long as pedicel; sixth and seventh subequal to fifth; eighth 1.1X as long as wide, 1.1X longer than pedicel; antennal club 0.36X as long as total antennal length, with segments almost symmetrical to slightly asymmetrical; ninth antennomere symmetrical, widened apically, 0.9X as long as wide, 1.5X as long as pedicel; tenth slightly asymmetrical, strongly widened apically, 0.7X as long as wide, 1.4X as long as pedicel; terminal antennomere asymmetrical, short ovoid, widest near mid length, 1.1X as long as wide, 2.4X as long as pedicel.

Prothorax: Pronotum widest at base, moderately transverse ( Figs. 83 , 113 ), 1.85–1.90X wider than long, 1.81– 1.88X wider at base than at front angles, 1.9–2.0X wider than head. Sides subsinuate in basal half, then converging to front angles. Front angles strongly produced, acute, almost sharp at tip. Hind angles slightly acute. Anterior margin wide, not arcuate medially. Lateral margins distinctly raised; wide, scarcely narrowing near base: width of margin at base less than 1/3 of the distance between basal pore and hind angle; area between marginal line and pronotal edge flat. Disc finely and closely punctate, weakly convex. Longitudinal sulci distinctly long and deeply and widely excavated, weakly convergent. Basal pores moderately large, slightly curved, markedly oblique. Basal sulcus absent. Pronotal base weakly lobed medially, straight to slightly emarginate near scutellum. Prosternal process narrow at base, scarcely widened posteriorly ( Fig. 132 ); slightly narrower than longitudinal procoxal diamater apically.

Pterothorax: Scutellum subpentagonal, rather small ( Fig. 136 ), 1.40–1.45X wider than long, 0.11X as wide as pronotum. Elytra 3.35–3.40 mm long, 1.18–1.20X longer than wide, 3.16–3.18X longer and 1.38–1.42X wider than pronotum; rather oblong, widest before basal third, weakly convergent in midlength, then roundly convergent to the rounded apex. Foveolate punctures arranged in longitudinal striae, lacking in apical half, punctures comparatively large and deep, separated by one diameter ( Fig. 125 ). Humerus prominent. Epipleuron moderately wide at base, 0.85X as wide as intercoxal process of metaventrite. Mesoventrite ( Fig. 138 ) scarcely excavated in front; bearing moderately large setose poreslaterally; mesoventral process scarcely wider than longitudinal coxal diameter, with three subtriangular figures formed by carinae. Metaventrite weakly convex, without modifications on the anterior margin; with pair of moderately large setose pores of approximately same diameter posterior to each mesocoxa ( Fig. 143 ). Metepisternum with moderately large setose pore ( Fig. 140 ).

Legs: moderately long and slender ( Fig. 182 ). Trochanters simple. Meso- and metafemora strongly widened at midlength, unarmed; metafemuras long as mesofemur, bearing moderately long decumbent setae. Meso- and metatibiae moderately slender; metatibia as long as metafemur, 0.33–0.35X as long as elytra, gradually widened distally, linear, unarmed. Metatarsus 0.55–0.58X as long as metatibia; second tarsomere produced and lobed, 2.5X as wide apically as the fourth tarsomere at midlength.

Abdomen: ventrite I as long as metaventrite and as ventrites II–V combined, with moderately coarse foveolate punctation, without protuberances. Ventrite V twice as long as IV, with apex briefly truncate. Ventrite VI rounded apically. Tergite VIII truncate. Median lobe very slender, flattened, curved, and slightly twisted, width subequal along its length, in ventral view ( Figs. 240–241 ). Tegmen with moderately large submembranous tegminal plate ( Fig. 199 ).

Description of females. Body 5.0– 5.2 mm long, 1.78–1.81X as long as wide, 2.6X as long as high. Antenna 0.40–0.42X as long as the body. Pronotum 1.85–1.90X wider than long, 1.85–1.88X wider at base than at front angles, 2.24–2.27X wider than head. Elytra 3.25–3.40 mm long, 1.16–1.18X longer than wide, 3.09–3.17X longer and 1.37–1.46X wider than pronotum. Metatibia 0.33–0.35X as long as elytra. Metatarsus 0.50–0.54X as long as metatibia. Ovipositor with proctiger rounded, coxites wide, with terminal styli ( Fig. 244 ).

Sexual dimorphism. No significant sexual dimorphism was found.

Variation. No significant variation was found.

Material examined. Types. Holotype (male): MEX: Casimiro Castillo, cam. a El Parotal, BTC, 700m, ex Favolus brasii . 14.VII.1999. J. L. Navarrete col. (CZUG); Paratypes: same data as holotype: (1 male, 2 females: CZUG); MÉXICO, Jalisco, Casimiro Castillo, BTS, 600 msnm, 19°3’47’’N 104°43’46’’W, ex Auricularia delicata , 06.VII.2007, col. H.E. Fierros–López (1 male, 1 female: CZUG; 1 male: MIZ); México: Jalisco, Villa Purificación, Camino San Miguel – Zapotán, 6 km. E. Zapotán, 17.IX.2010, BTSC pert. Tronco con hongos. E. Arriaga–Varela col (1 female: CZUG).

Distribution. MEXICO: Jalisco ( Fig. 266 ).

Biological Notes. Altitudinal range: 600– 700 m. Habitat: subdeciduous and deciduous tropical forest. Period of activity: July and September. Host fungi: Favolus tenuiculus ( Polyporales : Polyporaceae ) ( Fig. 53 ) and Auricularia delicata ( Auriculariales : Auriculariaceae ).

Etymology. Its name refers to the twisted or coiled shape of median lobe.

Figures

FIGURES 3 – 13. Morphology of Stenotarsus spp. 3) Head; 4) Mandible dorsal; 5) Mandible ventral; 6) Maxilla; 7) Labium; 8) Labial palp; 9) Hind wing; 10) Male abdominal segment IX ventral; 11) Basal fovea of pronotum; 12) Surface of elytron; 13) Metatarsus. 3 – 7, 9 – 13. S. latipes. 8. S. spiropenis.

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 50 – 53. Habits of Stenotarsus spp. 50) Pupae of S. cortesi sp. nov. on a dead log; 51) A pair of S. latipes Arrow mating on a dead log with Stereum ostrea fungi; 52) S. latipes and S. molgorae sp. nov. feeding on Lactarius sp.; 53) S. spiropenis sp. nov. feeding on Polyporus tenuicollis.

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 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 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 126 – 143. Thoracic structures of Stenotarsus spp. 126 – 133. Prosternal process. 134 – 136. Scutellum. 137 – 138. Mesoventrite. 139 – 140. Metepisternum. 141 – 143. Anterolateral part of metaventrite. 126) S. cortesi; 127) S. globosus, S. rubrocinctus; 128) S. meosamericanus; 129) S. oblongulus; 130) S. ovalis; 131) S. shockleyi; 132) S. spiropenis; 133) S. thoracicus; 134) S. globosus; 135) S. ovalis; 136) S. spiropenis; 137) S. nigricans; 138) S. spiropenis; 139) S. ovalis; 140) S. spiropenis; 141) S. marginalis; 142) S. nigricans; 143) S. spiropenis. PC. Procoxal cavity. PR. Procoxal rest. SP. Setose pore. MC. Mesocoxal cavity.

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 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 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)