Semiardistomis

Habitat of Semiardistomis cyaneolimbatus (Chevrolat) on Isla de la Juventud, Cuba.

Semiardistomis is a genus of beetles in the family Carabidae, containing the following species:

Semiardistomis cordicollis (Putzeys, 1846) Semiardistomis cyaneolimbatus (Chevrolat, 1863) Semiardistomis darlingtoni (Kult, 1950) Semiardistomis deletus (Putzeys, 1846) Semiardistomis exspectatus Valdés, 2012 Semiardistomis flavipes (Dejean, 1831) Semiardistomis jedlickai (Kult, 1950) Semiardistomis labialis (Chaudoir, 1837) Semiardistomis laevistriatus (Fleutiaux & Sallé, 1889) Semiardistomis maindroni (Kult, 1950) Semiardistomis major Valdés, 2012 Semiardistomis pallipes (Dejean, 1831) Semiardistomis pilosellus (Kult, 1950) Semiardistomis propinquus (Putzeys, 1866) Semiardistomis puncticollis (Dejean, 1831) Semiardistomis rugosus (Putzeys, 1866) Semiardistomis semipunctatus (Dejean, 1831) Semiardistomis subglabra (van Emden, 1949) Semiardistomis viridis (Say, 1823)

Adult. Body shape, color and size (Figs 1, 2, 37–41, 44–52): Body pedunculate. Body size small, ranging from 4.0 to 7.5 mm. Body monochromous, dark with metallic greenish and/ or brassy luster, shiny in species without microsculpture; appendages reddish brown. One species, Semiardistomis laevistriatus (Fleutiaux & Sallé), is dark brown a color also found in monticolous brachypterous species of the genus Ardistomis. Microsculpture: Frontoclypeus mostly smooth; supraantennal lobes smooth; vertex with mesh pattern isodiametric; gena with mesh pattern isodiametric; gula with mesh pattern transverse. Mandibles smooth; submentum and mentum with mesh pattern isodiametric. Pronotal disc generally smooth or with mesh pattern isodiametric, microlines very shallow, marginally and smooth at the center; proepisternum smooth or with isodiametric mesh pattern, submarginal band of microsculpture absent; prosternum smooth or with mesh pattern transverse. Metasternum smooth or with mesh pattern transverse. Abdominal sterna smooth or with mesh pattern transverse. Elytra smooth or with isodiametric mesh pattern covering entirely or only part of the disc. Chaetotaxy: Two pair of supraorbital setae (except for Semiardistomis puncticollis); pronotal disc with two pair of marginal setae (except for Semiardistomis puncticollis and Semiardistomis viridis); except for hirsute species, setae on elytral disc located in interval 3 and Semiardistomis darlingtoni (Kult) also in interval 5; abdominal sterna IV-VII with accessory setae. Head capsule: Clypeus with anterior margin concave medially; lateral lobes distinct, projected at the same level or below anterior margin. Antennal lobes prominent, sometimes partially sulcate medially in basal half. Frontoclypeus smooth except in Semiardistomis rugosus (Putzeys). Frontal impressions deep and wide from base of antennal lobes to anterior margin of clypeus. Gena with sides subparallel. Eyes: Hemispherical, prominent. Antennae (Figs 1, 2): Filiform to submoniliform. Antennomere 1 (a1) with single preapical seta. Antennomere 2 (a2) with few setae, shorter than antennomere 3 (a3). Antennomeres 4–11 densely setose, setae short. Mouthparts: Labrum (Figs 3, 4): anterior margin angulate, dentiform medially (dp); dorsal setae (ds) 7, as for most Clivinini; apical portion of epipharyngeal setae (es) serrulate anteriolaterally. Maxillae (Fig. 5) with lacinia (lac) apical tooth sharp and curved; galeomere 1 (g1) slender, a little longer than galeomere 2 (g2), the latter flat, broad and sinuate in outline; palpomere 2 (mp2) thick and triangular in outline; palpomere 3 (mp3) subequal in length to palpomere 4 (mp4); palpomere 4 apically acuminate. Stipes (st) with 4 setae, palpifer (pf) with one seta. (This structure shows little difference from other clivinines being most similar to that of Ardistomis. Mandibles (Figs 6A–6D): elongate, about 1.9 times longer than wide; ventral groove (vg) moderate in length, with short microtrichia (mt); left mandible with terebral ridge curved, the terebral tooth (tt) blunt and moderate in size, visible from ventral view, retinaculum (rt) broad, premolar tooth (pm) absent, the molar tooth (m) broad and rounded; right mandible with terebral ridge more or less straight, the terebral tooth small, not visible from ventral view, the retinaculum with acute anterior tooth, premolar tooth absent, and the molar tooth broad and rounded. Labium (Figs 13A–C, 14A–C) with mental–submental suture complete; submentum with paramedian projections distinct, two pair of setae; mentum (m) trapezoidal, about 1.5 times wider than long; two pair of setae; lateral lobes with anterior margins angulate; mental tooth (mt) with distal margin almost straight, about 1/3 length of lateral lobes (ll); median carina (mc)(13C, 14C) extended distad, or not, beyond anterior margin of lateral lobes; pit organs (po) distinct, opened through oval orifices in basal part of mentum or on mental–submental suture; palpomere 3 (lp3) subequal in length to palpomere 2, palpomere 2 (lp2) bisetose; ligula (Figs 13B, 14B) with glossal sclerite (gs) notably wide, its anterior margin with acuminate median projection and two long setae (as), two additional small setae (pas) located preapically; paraglossae (pg) divergent from glossal sclerite and covered with microtrichia dorsally, lobes thin and acuminate, extended distally beyond distal margin of glossal sclerite, apices serrulate. Pronotum. Ovate or cordate, anterior transverse and median longitudinal impressions distinct, proepisternum visible from above, lateral border not extended to base in some specimens. Anterior transverse and median longitudinal impressions distinct. Proepipleura visible from above. Elytra. Oval, convex; striae complete or obliterated to various degrees or absent (stria 1 always complete), punctate or not, punctures shallowly to deeply impressed. Preapical epipleural plica (Fig. 22, ep) displaced outward, interrupting outline of elytra. Hind wings. Macropterous or brachypterous. Underside (Fig. 2). Metasternum with a row of setiferous punctures along margin of coxal cavity, median contact with abdomen dividing metacoxae. Suture between abdominal sterna III and IV obliterated at middle. Pleurite VII with small projection(Fig. 22, app) fitting into elytral epipleural plica (ep,). Legs. Slender, protibia (Figs 23, 24) with basal half of ventral surface with a group of setae, protarsomeres in males slightly dilated. Male genitalia (Figs 25, 26). Phallus lightly sclerotized; basal bulb with basal orifice (bo) oval, wide; basal projection (bp) distinct, apical margin curved; basal apophysis (ba) moderate; median portion tubular; apical portion formed by two lamellae (rl and ll). Endophallus pubescent in apical portion; basal sclerite (bs) clearly developed. Parameres subequal in length, the right one wider, both with 4-5 apical setae. Female genitalia (Figs 27, 28). Ovipositor: gonocoxa (gc) unsegmented, very slender, with a pair of setae at apex, surface with micropores; laterotergites (lt) thinly sclerotized, flat and asetose, sclerotized border thin and folded in basal portion with a small anterior part; mediotergite (mt) wide, its width delimited by external borders of laterotergites. Reproductive tract: bursa copulatrix (bc) elongate; spermathecal duct (spd) =distance from apex of bursa copulatrix to insertion point of spermathecal gland duct (spgd) relatively short or long, spermathecal gland duct elongate; spermatheca (sp) various in thickness, length, and conformation; see description of this structure for each of the two species-groups.

(Figs 57–59)The range of this genus is co-extensive with the range of the Ardistomina.