Drilus robustus, Kobieluszova, Lucie & Kundrata, Robin, 2015

Kobieluszova, Lucie & Kundrata, Robin, 2015, Taxonomic review of Drilus Olivier, 1790 (Elateridae: Agrypninae: Drilini) from Asia Minor, with descriptions of seven new species and comments on the female antennal morphology in Drilini, Zootaxa 4012 (1) : -

publication ID	https://doi.org/ 10.11646/zootaxa.4012.1.4
publication LSID	lsid:zoobank.org:pub:C3B3A06D-C18C-4B66-83E9-51B605E11862
DOI	https://doi.org/10.5281/zenodo.6112434
persistent identifier	https://treatment.plazi.org/id/C3140C0E-FF8B-FFF0-3DBF-B5FE5E8EC21C
treatment provided by	Plazi
scientific name	Drilus robustus
status	sp. nov.

Treatment

Drilus robustus sp. nov.

( Figs 8 View FIGURES 1 – 12 , 18 View FIGURES 13 – 21 , 28, 32–33 View FIGURES 22 – 33 , 40 View FIGURES 34 – 45 , 46–49 View FIGURES 46 – 50 , 51–52, 54 View FIGURES 51 – 54 )

Type locality. Turkey, Antalya province, Kemer env.

Type material. Holotype, male: " Turkey mer. occ., Kemer env., 1.– 11.6.2011, J. Bednář lgt." ( PCRK); 81 paratypes: 5 males, the same data as for the holotype ( PCJB, PCRK); 4 males, " Turkey mer. occ., Kemer env., 1.– 11.6.2011, J. Brádka lgt." ( PCJR); 3 males, " Turkey mer. occ., Kemer env., 1.– 11.6.2011, J. Januš lgt." ( PCJJ); 62 males, 1 female, " Turkey, Antalya pr., Kemer env., 10m, 26.– 28.5.2012, Krol, Fusek & Masek leg." ( LMBC, PCRK); 5 males, " Turkey, Antalya pr., Kemer env., 10–50m, 26.– 28.5.2012, Krol, Fusek & Masek leg." ( PCRK); 1 male, " Turkey, Antalya pr., Kemer env., 50m, forest, in flight, 28.5.2012, Krol, Fusek & Masek leg." ( PCRK).

Other material studied. 1 male, " Türkei, Catallar, 6.VI.1997, leg. H. Schmid" ( PCRS); 1 larva, " Turkey, Antalya pr., Kemer env., 10m, 26.– 28.5.2012, Krol, Fusek & Masek leg." ( PCRK).

Diagnosis. The male of Drilus robustus sp. nov. can be easily distinguished from its congeners from Asia Minor by the following combination of characters: robust general habitus, reddish brown body coloration with bicolored elytra ( Fig. 8 View FIGURES 1 – 12 ), strongly pectinate antennnae ( Fig. 28 View FIGURES 22 – 33 ), and pronotum widest slightly before middle, constricted anteriorly ( Fig. 18 View FIGURES 13 – 21 ). This species is very similar to D. bleusei ( Olivier, 1913) from Rhodes, but they differ in e.g. the coloration of elytra (only apical 2/5 of elytra black in D. bleusei ), the shape of pronotum (more constricted anteriorly in D. bleusei ) and male genitalia (wider paramera and relatively shorter phallus in D. bleusei ) ( Trllova & Kundrata 2015).

Description. Male (holotype). Body 2.6 times longer than width at humeri, yellowish brown to reddish brown, antennae slightly darker, elytra with black coloration beginning in humeral part and continuing obliquely to the inner elytral margins; body covered with yellowish pubescence ( Fig. 8 View FIGURES 1 – 12 ). Head including eyes about as wide as anterior margin of pronotum ( Fig. 18 View FIGURES 13 – 21 ), dorsally with shallow depression, sparsely covered with fine punctures, with sparse erect pubescence; clypeal margin widely concave. Eyes medium-sized, their frontal distance 2.3 times eye diameter. Mandibles robust, long, curved, shiny, incisor margin with stout tooth medially. Labrum covered with sparse long setae; maxillary palpi with ultimate palpomere obliquely cut, flattened apically. Antennae pectinate, reaching one third of elytral length, antennomeres 3–10 pectinate, apical antennomere simple, longest, more than 2 times longer than stem of penultimate antennomere ( Fig. 28 View FIGURES 22 – 33 ). Pronotum slightly convex, transverse, widest slightly before middle, 1.5 times wider posteriorly than length at midline. Anterior margin straight, lateral margins deeply emarginate at basal third, widened at apical two thirds, posterior margin slightly convex, bisinuate. Anterior angles inconspicuous, posterior angles rectangular, slightly turned upward ( Fig. 18 View FIGURES 13 – 21 ); surface of disc sparsely covered with fine punctures, with sparse erected setae, pubescence denser at angles and lateral margins. Scutellum flat, triangleshaped, apical part rounded. Prosternum transverse, with long transverse groove near frontal margin, frontal margin almost straight, prosternal process short, elevated, gradually declivitous. Mesoventrite widely v-shaped. Elytra subparallel-sided, with longitudinal keel running from humeri toward apex, finely punctured, covered with semierect pubescence, sparser basally, denser at lateral margins and apically. Legs slender, slightly compressed, with sparse, long, semierect setae, tarsomeres 1–4 gradually shortened, tarsomere 4 shortest, apical tarsomere apparently longest, almost as long as combined lengths of tarsomeres 2–4 ( Fig. 32 View FIGURES 22 – 33 ). Last abdominal segments as in Fig. 33 View FIGURES 22 – 33 . Aedeagus with phallus considerably curved, longer than paramera; paramera long, with basal inner parts strengthened; phallobase robust, widely v-shaped ( Fig. 40 View FIGURES 34 – 45 ).

Female. Larviform, body elongate. All body parts yellowish to light brown, head orange, dorsal surface of thoracic and abdominal segments with dark brown to black markings; body covered with short yellowish pubescence, sparse medially, dense at margins ( Fig. 46 View FIGURES 46 – 50 ). Head prognathous, well sclerotized, small, narrower than pronotal anterior margin. Eyes small, their frontal distance more than 5 times eye diameter. Antennae 11- segmented, filiform, covered with sparse semierect setae; apical antennomere minute, narrowed ( Fig. 48 View FIGURES 46 – 50 , Table 1). Mandibles robust, shiny, considerably curved, incisor margin medially with small tooth. Pronotum widest at posterior two thirds; thoracic and abdominal tergites wrinkled, mainly medially. Abdomen with nine visible segments, apical segment much narrower and smaller. Ovipositor with fused valviferes and coxites. Vagina simple, slender, short, sac-like ( Fig. 47 View FIGURES 46 – 50 ).

Larva. Body elongate, slightly widened towards apex. Body yellowish, head, dorsal surface of thoracic and abdominal segments, lateral pleural processes and legs brown; each tergite with a pair of black spots; body covered with long yellowish or brown pubescence ( Fig. 51 View FIGURES 51 – 54 ). Head prognathous, well sclerotized, small, narrower than frontal pronotal margin. Mandibles sclerotized, narrow and falcate. Abdomen with sclerotized and pigmented tergites, with long setae, especially dorsally ( Fig. 49 View FIGURES 46 – 50 , 51, 54 View FIGURES 51 – 54 ). Lateral pleural and tergal processes well developed. Last segment small, slender. Cerci slightly bent upward, densely covered with long pubescence, cerci apically acuminate; with long apical part ( Fig. 49 View FIGURES 46 – 50 ).

Measurements. Holotype. BL 7.1 mm, EL 5.2 mm, WHe 1.8 mm, WHum 2.7 mm, PL 1.4 mm, PW 2.2 mm, Edist 1.3 mm, Ediam 0.6 mm. Paratypes, males. BL 6.2–9.5 mm, EL 4.5–6.6 mm, WHe 1.6–2.3 mm, WHum 2.4– 3.6 mm, PL 1.3–1.8 mm, PW 2.0– 2.8 mm, Edist 1.1–1.6 mm, Ediam 0.5–0.7 mm. Paratype, female. BL 20.5 mm, BW 4.7 mm. Larva. BL 18.0 mm, BW 3.5 mm.

Distribution. Turkey (Antalya Province; Fig. 55 View FIGURE 55 ).

Etymology. The specific epithet refers to the robust habitus of this species.

Biology and ecology. Drilus robustus sp. nov. occurs in a lowland forest; most specimens were collected at a forest edge ( Fig. 53 View FIGURES 51 – 54 ). Larvae prey on the snail Rumina decollata ( Linnaeus, 1758) (Achatinoidea: Subulinidae ; Fig. 54 View FIGURES 51 – 54 ). Adults can be found from late May to early June. After pupation, males sit on grass and tree branches waiting for the females which they mate almost immediately after their emergence (L. Fusek, J. Bednář, pers. communication; Fig. 52 View FIGURES 51 – 54 ).

Table 1. Numbers of antennomeres in females of different Drilini species. 1 xx+1 – the apical antennomere is minute;? – one of the antennomeres might in fact consist of two fused antennomeres; pers. com. – personal communication; det. – determined.