Pactola corporosa, Mazur, Miłosz A. & Jezuita, Anna, 2015

Mazur, Miłosz A. & Jezuita, Anna, 2015, A new species of Pactola Pascoe, 1876 (Coleoptera: Curculionidae: Eugnomini) from New Caledonia, Zootaxa 3931 (2), pp. 279-285 : 280-285

Pactola corporosa sp. n.

Diagnosis. Elytral disc with intervals 2–5 elevated basally and with large tubercles medially on interval 3 and beyond middle on interval 5 ( Fig. 2 ). Tarsal claws weakly curved, strongly extended basally ( Fig. 11 ). Male tegmen with very short, parameroid lobes (Fig. 25). Aedeagus with apodemes two times longer than aedeagal pedon; endophallus with characteristic, complex apparatus as long as pedon (Figs. 15–19).

Description. Male

Body colour and vestiture ( Fig. 1 ). Body entirely covered with small, subcircular, adjoining scales. Pronotum with sparse, protruding scales at anterior part and in middle. Elytra with intervals with single, thin, elongate scales. Tubercles on elytra furnished with bundle of oblanceolate, erect scales; scales very variable in color, from bright to blackish, in some specimens with darker, oblique medial stripe. Integument usually dark brown. Tarsi, apical part of tibiae, distal parts of femora and scape lighter (except darker apical part). Funicle and club light but visibly darker than distal part of scape; first desmomere darkened except at base. Ventral part with the same coloration as dorsum; basal part of metepisternum and metasternum with bright, adjoining, suboval setae, much larger than those on dorsal surface.

Head ( Figs. 3–5, 14 ). Head capsule transverse (hw/hl = 1.20–1.63). Frons narrower than basal part of rostrum, flat; eyes gently protruding above. Vertex glabrous, without tubercles. Eyes rounded, strongly convex in dorsal view; longer than half length of head (eyl/hl = 0.60–0.75). Temples shorter than eyes in dorsal and lateral views of head. Frons and inner margin of eyes without elongate scales. Rostrum almost straight, slightly bent near antennal insertion; longer than maximal width at apex (arw/rl = 0.50–0.73); portion before insertion of scape distinctly narrowed in both sexes; apex glabrous, shining, only with few, isolated, piliform scales. Scrobes straight, short, not reaching anterior margin of eyes. Underside of rostrum glabrous, black, with thin, piliform scales on prorostrum. Antennae inserted at approximately two-thirds length of rostrum. Scape elongate, reaching beyond posterior margin of eyes. Funicle much shorter than scape; first desmomere elongate, longer than 2 and 3 combined; 2 longer than 3; 3 slightly longer than wide; desmomeres 4 and 5 subquadrate, almost as long as their widths; 6 and 7 wider than long. Club elongate, almost twice as long as its width, and almost as long as last six desmomeres of funicle; covered with dense, piliform setae.

Pronotum ( Figs. 2, 14 ). Subquadrate to transverse (bpw/pl = 1.00–1.30), constricted before slightly rounded anterior margin and before rounded basal margin. Base 1.20–1.30 × as wide as anterior margin. Pronotal disc glabrous, without tubercles. Dorsal surface matte, with small, sparse punctures.

Elytra ( Figs. 2, 14 ). Stout, in dorsal view 1.40–1.50 as long as maximum width between humeral calli (el/ mew). Elytral base more than twice as wide as base of pronotum. Humeral calli well developed, protruding. Elytral disc with mostly strongly protruding tubercles, level of development of these tubercles variable, from strongly protruding to fine; intervals 2–5 convex, surface between them and medial tubercles depressed. Largest tubercles in middle of interstria 3 and beyond middle on interstria 5; two or three small tubercles on second interstria at apical half. Interstria 5 glabrous, not extended into prominent tubercle present on elytral declivity. Widths of interstriae irregular, distinctly broadened where tubercles are situated (except second interval). Striae with isolated, small, deep, suboval points. Scutellar shield subquadrate.

Legs ( Figs. 6–11 ). Front and middle tibiae slender, strongly constricted apically; outer margin with elongate, strongly protruding setae almost as long as half width of tibia. Hind tibiae strongly, regularly curved, slightly constricted before apex. Front and middle femora stout; front femur with minute, middle with slightly larger tooth. Hind femora strongly clavate with inner surface flattened, smooth and shiny to half of basal length; medial tooth strongly extended; its outer margin with line of short setae, some of them elongate.

FIGURE 15–26. Pactola corporosa sp. n.: 15—aedeagus, lateral view; 16—aedeagus, dorsal view (ca—complex aparatus); 17—complex aparatus, dorsal view; 18—complex aparatus, lateral view; 19—complex aparatus, ventral view; 20—male pygydium, ventral view; 21—abdominal tergite 8, female; 22—spermatheca; 23—gonocoxite with genital sheath; 24—8th sternite, female; 25—tegmen, male; 26—spiculum gastrale, male.

MAP 1. Distribution of Pactola corporosa sp. n. in New Caledonia.

First tarsal segment of front and middle tarsi elongate, longer than 2 and 3 combined; on hind legs longer than remaining segments combined; tarsal claws elongate, slightly curved, strongly extended basally.

Abdomen ( Figs. 12, 13 ). Subquadrate, slightly wider than long in male. Entirely covered with two types of intermixed scales—minute, suboval, recumbent and piliform, protruding. First two ventrites with distinct, sparse, well isolated punctures, surface between them scabrous, matte. Sutures between ventrites 2–3 and 3–4 strongly depressed. Last ventrite truncate apically.

Terminalia (Figs. 15–20, 25, 26). Pedon of aedeagus short, in dorsal view ca 2 × as long as wide; basal portion weakly sclerotised, prominent, incised apically; apex widely rounded, laterally slightly curved. Aedegal apodemes elongate, almost 2 × as long as pedon. Endophallus with distinctive, dense spines in suborificial part and complex transfer aparatus that is almost as long as pedon. Tegmen with thin, short parameroid lobes that are separated, sclerotised only basally and connected to each other by membrane; tegminal apodeme elongate, as long as tegminal ring. Spiculum gastrale with elongate apodeme, and with two, hooked processes basally; hemisternites irregular, well sclerotised. Pygidium subquadrate with maximum width at apical half; lobed middle part small with single setae.

Female ( Figs. 3, 12 , 21–24). Very similar to male. Rostrum slightly longer, more slender. Eyes weakly convex. Abdomen longer than wide; last ventrite rounded, glabrous, with distinct punctures. Spermatheca robust, weakly curved. Spiculum ventrale with distinctly incised apical lobe, furnished with fine punctures and short setae. Abdominal tergite 8 triangular, surface transversally wrinkled, apex truncate, edge with numerous, strongly elongate setae. Styli very short with single, elongate apical seta; gonocoxite oval, ca 3 × as long as wide.

Material examined. Holotype: ♂— New Caledonia (N), 21 0 11’S /165 0 16’E, Aoupinié, 950 – 1000 m., meteo st. – summit, 8.02.2004, leg. M. Wanat ( MNHN)

Paratypes: 1♂ —same data as holotype ( MNHW); 8♂♂, 3♀♀— New Caledonia (N), 21 0 11’S /165 0 17’E, Aoupinié, 900–950 m, gate—meteo st., 8.02.2004, leg. M. Wanat ( MNHW); 2♀♀— New Caledonia (N), 21 0 11’S / 165 0 17’E, Aoupinié, 820 m, camp at road, ad lucem, 8.02.2004, leg. M. Wanat ( MNHW); 1♀— New Caledonia (N), 21 0 08.9’S /165 0 19.4’E, Aoupinié (refuge), 19.01. 2007, 420 m, leg. R. Dobosz ( USMB); 1♂, 2♀♀— New Caledonia (N), 21 0 00.318’S /165 0 14.605’E, Tchamba (Wâo Uni), 20.03.2008 at light, from refuge to 500 m, leg. R. Dobosz ( USMB); 1♀— New Caledonia (S), 22 0 01.9’S /166 0 28.0’E, Dzumac Mts (Mt Ouin road junction), 28.12. 2006, 900 m, leg. M. Wanat & R. Dobosz ( MNHW).

Measurements. Holotype ♂ apw 0.65; arw 0.30; bew 1.80; bpw 0.85; el 2.60; eyl 0.30; frw 0.25; hl 1.00; hw 0.60; lb 3.60; mew 1.80; mith 0.25; mpw 0.85; mth 0.50; pl 0.75; ptbl 0.85; ptbmw 0.15; rl 0.50; scl 0.65.

Paratypes ♂/♀: apw 0.65/0.60–0.65; arw 0.35/0.30–0.35; bew 1.70–1.80/1.45–1.65; bpw 0.80–0.85/ 0.70–0.80; el 2.50–2.60/2.25–2.50; eyl 0.30/0.25–0.30; frw 0.25–0.30/0.20–0.25; hl 0.45–0.50/0.40–0.50; hw 0.60–0.65/0.55–0.60; lb 3.40–3.60/3.25–3.50; mew 1.70–1.80/1.50–1.70; mith 0.25/0.20; mpw 0.80–0.85/ 0.70–0.80; mth 0.45–0.55/0.45–0.55; pl 0.50–0.75/0.50–0.70; ptbl 0.80–0.90/0.80–0.85; ptbmw 0.10–0.15/ 0.10–0.15; rl 0.45–0.50/0.50; scl 0.65–0.70/0.60–0.65.

Etymology. The specific epithet comes from the Latin corporosa (= corpulent, obese) and refers to the corpulent form of the elytral disc.

Distribution. New Caledonia (Map 1).

Biology. Unknown.

Remarks. The new species is most similar to the other members of the genus from New Caledonia having tubercles on the elytra ( P. setacea Montr. and P. proxima Mazur ). It can, however, be distinguished by the following combination of features: interstria 5 glabrous, not extended into prominent tubercle protruding beyond the edge of elytra at elytral declivity; front femora with minute teeth (large in P. setacea and P. pro x i m a); male tegmen with very short parameroid lobes (elongate in P. s e t a c ea and P. pro x i m a); aedeagus with complex aparatus (complex aparatus absent in P. setacea and P. p rox i m a).

Figures

FIGURE 1. Dorsal habitus colour photograph of Pactola corporosa sp. n., holotype, male.

FIGURE 2 – 14. Pactola corporosa sp. n.: 2 — elytra and pronotum, dorsal view, male; 3 — head, dorsal view, female; 4 — head, dorsal view, male; 5 — antenna; 6 — front leg (minute teeth marked by arrow); 7 — middle leg; 8 — hind leg; 9 — front tarsus; 10 — hind tarsus; 11 — tarsal claws; 12 — last ventrite, female; 13 — last ventrite, male; 14 — general habitus, lateral view, male.