Barretonus daute García & Andújar, 2019

García, Rafael, Andújar, Carmelo, Oromí, Pedro, Emerson, Brent & López, Heriberto, 2019, The discovery of Barretonus (Curculionidae: Cossoninae) in the Canary Islands: barcoding, morphology and description of new species, Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 59 (2), pp. 443-452 : 449-451

Barretonus daute García & Andújar , sp. nov.

( Figs 2 , 3A *–G*)

Type locality. Camino Real las Arenas,Canal de Icod, Los Silos,Tenerife, Canary Islands (213 m a.s.l., 28°21′51.77″N, 16°48′4.44″W).

Type material. HOLOTYPE: 1 J, Camino Real las Arenas, Canal de Icod , Los Silos , Tenerife , Canary Islands (213 m a.s.l., 28°21′51.77″N, 16°48′4.44″W), 10.i.2019, H. López & D. Suárez leg. ( MCNT). PARA- TYPES: 13 spec., same data as holotype, 3 JJ 3 ♀♀; same locality as holotype, 2JJ 4♀♀, 1.ix.2017, C.Andújar leg. Canary Islands,Tenerife, Caleta de Interián (219 m a.s.l., 28º21′51.74″N, 16º47′14.73″W): 1 ♀, 5.xii.2001, sieving Pistacia atlantica litter, M.A. Peña leg. Depositories: CAF (1 J 1 ♀), HLH (1 J 1 ♀), IPNA-CSIC (1 J 2 ♀♀), MCNT (1 ♀), POM (1 J 1 ♀), RGB (1 J 1 ♀).

Description. Male. Total length (including rostrum) 2.35–2.75 mm. Maximal width 0.85–1.0 mm. Body dark reddish-brown, vestiture glabrous, with tiny setae (2–3 μm), more visible on elytral striae, interstriae and edges of pronotum, setae longer on the rostral apex, antennae and legs. Apterous.

Head sphero-conical, short, with a few ommatidia.

Rostrum (average length 0.38 mm), 0.66× as long as pronotum and 1.7× as long as its width at apex, with punctures and some setae; slightly curved in lateral view, dorsally with slightly concave sides in middle. Rostral surface and punctation similar to that on frons, the latter slightly depressed and sometimes with small fovea; posterior part of rostrum convex in lateral view. Ventrally with irregular row of punctures in median zone and with two fine carinae converging towards base of rostrum.

Antennae hirsute; scape curved, widest in apical half, 3.5× as long as its maximum width and 0.75× as long as funicle. First funicular antennomere longest, cylindro-conical, 1.25× as long as wide, funicular antennomeres 3 to 7 tronco-conical and transverse, 2 narrower.Antennal club oval, 1.9× as long as wide and as long as antennomeres 6‒7 combined.

Pronotum transverse (0.96× shorter than wide), with slightly convex sides, widest in 1/5 of the base, anterior edge 0.72× narrower than basal edge. Surface smooth and shiny, except on basal edge and lateral margins; with strong round punctures separated by 1× their diameter, punctures smaller and closely located at apices.

Scutellum not visible.

Pterothorax with elytra slightly oblong, base slightly concave and wider than pronotum, sometimes slightly sinuous in middle; 2.3× as long as pronotum and 1.66× as long as wide; striae composed of well-marked punctures, slightly shallower towards short steep apical declivity. Interstriae somewhat convex with small punctures; surface rough and shiny, becoming striated towards apex and sides. Metaventrite with microreticulated surface, 1.63× as wide as long, with large depression on disc and another small one in apical zone.

Abdomen ventrally with shiny surface and round punctures separated by 1× their diameter. First two ventrites with smooth and shiny surface, with convex disc, punctures finer and more separated between them; fifth ventrite 2.7× as wide as long, with similar punctation as that on first two ventrites.

Legs with smooth, shiny surface and well-defined punctation, slightly covered by scaly dispersed setae. Procoxae separated by 1.5× their diameter from anterior margin of pronotum and 0.28× their diameter from posterior margin of pronotum; separated between each other by 0.14× procoxal diameter. Mesocoxae 1.4× their diameter apart. Pro-, meso- and metafemora respectively 3.0×, 3.3× and 4.2× as long as wide. Protibiae 3.3× as long as wide at apex (without counting uncus), almost straight, with external edge slightly sinuous and with dense strip of setae in slight inner apical notch. Meso- and metatibiae 3.6× and 4.4×, respectively, as long as wide. First tarsomere 2.5× longer than wide; second tarsomere isodiametric; third strongly bilobed and transverse; onychium approximately 4.2× as long as wide.

Aedeagus. Tegmen without parameroid lobes and with very short manubrium ( Fig. 3A *). Spiculum gastrale robust, with asymmetric arms, shorter arm more than half length of longer, longer arm with external lamella and shaft strongly bent distally ( Fig. 3B *). Penis almost symmetric in dorsal view, apex pointed, laterally with one side concave and the other one convex; slightly curved in lateral view, with acute apex; dorsal plate incomplete; internal sac with densely arranged teeth in apical third of tube ( Figs 3C *–D*).

Female. Similar to male, total length 2.68–2.82 mm, maximal width 0.75–0.83 mm. Rostrum 2.25× as long as wide. Scape 4.6× as long as wide, widening from middle; first funicular antennomere wider than the other antennomeres. Elytra 2.2× as long as pronotum, 1.62× as long as wide. 5 th ventrite 2.5× as wide as long. Pro-, meso- and metafemora respectively 2.83×, 3.0× and 3.3× as long as wide. Pro-, meso- and metatibiae respectively 3.4×, 3.7× and 3.62× as long as wide.

Ovipositor with cylindrical and narrow apical styles, bearing 4–5 macrosetae ( Fig. 3F *). Spiculum ventrale bilobed bearing 14 macrosetae ( Fig. 3E *); manubrium long, sinuous, with sagittate tip. Spermatheca with curved cornu and hardly developed glandular lobe ( Fig. 3G *).

Differential diagnosis. For comparison with B. auarita sp. nov., see Table 2.

Etymology. The specific epithet daute is the name of the ‘menceyato’ of Daute, the westernmost of the nine kingdoms in which the ancient inhabitants of Tenerife, the Guanches, had divided the island. This is the geographical area where this new species was found. Noun in apposition. Biology and ecology. All specimens were collected in the municipality of Los Silos at about 213 m a.s.l., in an area known as Camino Real las Arenas, with northwest orientation, partially dominated by well preserved thermo- -sclerophyllous vegetation. The specimens were obtained from two soil samples taken to a depth of 20 cm and from two litter-screening samples (one from under a Phoenix canariensis palm and the other one under a Pistacia atlantica tree). Both soil and litter samples were washed to refloat the organic matter for later extraction of fauna in Berlese funnels (see ARRIBAS et al. 2016, for details).

Figures

Fig. 2. Dorsal and lateral habitus: A – Barretonus auarita sp. nov.; B – B. daute sp. nov.

Fig. 3. Structures of the genitalia of males and females of B. auarita sp. nov. (letters without asterisks) and B. daute sp. nov. (letters with asterisks):A – tegmen. B – spiculum gastrale. C–D – aedeagus in dorsal and lateral view. E – spiculum ventrale. F – ovipositor. G – spermatheca.