Stenotarsus shockleyi, 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 : 44-45

Stenotarsus shockleyi sp. nov.

( Figs. 39 , 75 , 89 , 111 , 131 , 124 , 153 , 180 , 204 –205, 262 )

Diagnosis. This species is very similar to S. globosus , S. rubrocinctus , and S. raramuri sp. nov., sharing a similar antennal structure ( Figs. 56 , 72, 75 ), genitalia of both sexes ( Fig. 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 ). Among the members of this group, S. shockleyi is distinguished by its comparatively small size (5.1–5.4 mm), antenna red with antennomeres 7–11 black, pronotum red with a large triangular black macula reaching anterior margin and not surpassing basal pores at base ( Fig. 39 ), prosternal process scarcely widened distally ( Fig. 131 ), elytra with foveolate punctures rather large and deep ( Fig. 124 ), concavity on male metaventrite subpentagonal ( Fig. 89 ), and metafemur with tooth poorly developed ( Fig. 153 ).

Description of males. Body 5.1–5.4 mm long, long oval, markedly convex ( Fig. 39 ), 1.82–1.90X as long as wide, 2.8–2.9X as long as high. Contrastly colored with head orange to red; antenna orange-red with antennomeres 7–11 black, sixth antennomere may be infuscated; pronotum red with a large triangular black mark reaching anterior margin and not surpassing basal pores at base, margins and angles orange-red; hypomeron and prosternum red; scutellum black or rarely red; elytra red, each elytron with a large, oval, black macula; epipleura red; meso and metathorax black with mesoventrite infuscate or red at least medially; legs orange-red; abdomen orange-red with first ventrite black margined by red. Densely covered with long, suberect, golden setae; with black setae in the black parts of elytra and pronotum.

Head: Clypeus transverse 2.2X wider than long. Terminal labial palpomere narrow, acuminated, narrowly truncate apically. Interocular distance 0.70X as wide as head. Antenna moderately long and slender ( Fig. 75 ), 0.40– 0.42X as long as body; scape 1.3X as long as wide, 1.5X longer than pedicel; pedicel 1.3X longer than wide; third 1.7X as long as wide, 1.2X as long as pedicel; fourth 1.5X as long as wide, 1.2X as long as pedicel; fifth 2X as long as wide, 1.6X as long as pedicel; sixth 1.9X as long as wide, 1.5X as long as pedicel; seventh 1.6X as long as wide, 1.4X as long as pedicel; eighth 1.3X as long as wide, 1.2X longer than pedicel; antennal club 0.39X as long as the total antennal length, with segments almost symmetrical; ninth widened apically, 1.3X as long as wide at apical side, 2X as long as pedicel; tenth almost symmetrical, widened apically, 1.1X as long as wide, 1.8X as long as pedicel; terminal antennomere widened apically, 1.5X as long as wide, 3.2X as long as pedicel.

Prothorax: Pronotum widest at base, transverse ( Fig. 111 ): 1.95–2.05X wider than long; 1.95–2.00X wider at base than at front angles; 2.15–2.25X wider than head. Sides weakly convergent in posterior half, then weakly rounded to front angles. Front angles produced, right-angled, narrowly rounded at tip. Hind angles right-angled. Anterior margin narrow, slightly arcuate medially. Lateral margins moderately raised, moderately wide, weakly narrowing posteriorly, more strongly close to base: width of margin at base1/3 of the distance between basal pore and hind angle; area between marginal line and pronotal edge weakly concave to flat. Disc moderately convex, finely and closely punctate. Longitudinal sulci feeble, short, weakly curved. Basal pores large, slightly curved, oblique. Basal sulcus lacking near scutellum. Pronotal base lobed medially. Prosternal process ( Fig. 131 ) narrow at base, almost parallel sided; distinctly narrower than longitudinal procoxal diameter apically.

Pterothorax: Scutellum triangular, moderately large, 1.65–1.70X wider than long, 0.17–0.18X as wide as pronotum. Elytra length 3.50–3.64 mm; 1.2X longer than wide; 3.39–3.42X longer and 1.35–1.4X wider than pronotum; ovoid, widest near basal third, then roundly converging to the markedly acuminated apex; moderately densely punctate with foveolate punctures rather large and deep, separated by 2–4 diameters ( Fig. 124 ), smaller near scutellum and sparser and shallower apically. Humerus moderately prominent. Epipleuron at base 0.95X as wide as intercoxal process of metaventrite. Mesoventrite deeply excavated in front; setose pores on sides small; mesoventral process as wide as longitudinal coxal diameter, without medial carinae. Metaventrite weakly convex, with densely pubescent subpentagonal concavity, near the anterior margin between mesocoxae ( Fig. 89 ); with a pair of small setose pores of approximately same diameter posterior to each mesocoxa. Metepisternum with small setose pore.

Legs: moderately long and slender ( Fig. 180 ). Trochanters simple. Meso- and metafemora moderately slender, widest at basal third; mesofemur unarmed; metafemur slightly longer than mesofemur, bearing moderately long decumbent setae, with a small, truncate, tooth in the base of medial margin ( Fig. 153 ). Meso- and metatibiae very slender; metatibia as long as metafemur, 0.34–0.35X as long as elytra, scarcely widened apically, slightly bent in apical third, with a row of small tubercles on medial margin. Metatarsus 0.58X as long as metatibia; second tarsomere produced and lobed, 2X 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 slightly truncate. Median lobe slender, curved, gradually narrowed and with apical crest in ventral view ( Fig. 205 ), widened apically, in lateral view ( Fig. 204 ). Tegmen with moderately large submembranous tegminal plate.

Description of female. Female unknown.

Sexual dimorphism. Unknown.

Variation. No significant variation was found.

Material examined. Types. Holotype (male): CAE Cotaxtla, Ver., Mex. 9.VII.1987, K.R. Pullen, Trampa Malaise (CZUG); Paratype (male): same data as holotype: (CZUG).

Distribution. MEXICO: Veracruz ( Fig. 262 ).

Biological Notes. Altitudinal range: 100 m. Period of activity: July. Collecting method: Malaise trap.

Etymology. This species is dedicated to Dr. Floyd W. Shockley, for his work on Endomychidae and willingness to share his knowledge.

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 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 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 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 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 260 – 262. Distributional maps of Stenotarsus spp. 260) S. guatemalae (C), S. marginalis (S); 261) S. kafkai (C), S. mexicanus (S), S. nigricans (T); 262) S. latipes (C), S. shockleyi (S). Yellow circles (C), red squares (S), blue triangles (T).

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 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.