Neacratus ater Mantilleri, 2018

Mantilleri, Antoine, 2018, Two New Species of Neacratus Alonso-Zarazaga, Lyal, Sforzi, and Bartolozzi (Coleoptera: Curculionoidea: Brentidae) from Peru and French Guiana, The Coleopterists Bulletin 72 (4), pp. 785-791 : 785-787

Neacratus ater Mantilleri , new species

Zoobank.org/ urn:lsid:zoobank.org:act:273B1A1B-CAE2-4A19-AF90-9567805BD3FD

Holotype. ♂, “Muséum Paris, Pérou, environs de [surroundings of] Satipo, III.1985 / A. Mantilleri prép. micro. n°AM00345 / holotype / Neacratus ater n. sp. A. Mantilleri det. 2017 / MNHN EC8673 ”.

Description of Male. Length from apex of rostrum to apex of elytra = 16.3 mm; length from apex of pronotum to apex of elytra = 11.1 mm; width across humeral calli = 2.1 mm. Body dark brown, apex of antennae reddish; darker post-median blotch on elytra hardly distinct ( Fig. 1 ). Head: Prorostrum 0.58X as long as meso- and metarostra together, enlarged at apex with deep median notch, not grooved, not carinate on sides ( Fig. 4 ). Mesorostrum with inconspicuous median groove. Metarostrum not grooved, smooth, not carinate on sides or on median area. Eyes 0.56X as long as temples. Head smooth, cylindrical, without sensorial pores on sides ( Fig. 5 ); interocular fovea missing. Sides of metarostrum with few sensorial pores in front of eyes ( Fig. 5 ). Venter ( Fig. 6 ) with hairy, nonaligned sensorial pores; venter of metarostrum with 2 longitudinal areas with sensorial pores separated by smooth longitudinal median carina; no ventral pores on meso- and prorostra.Antennomere 2 enlarged at apex, hardly longer than wide ( Fig. 7 ); antennomere 3 subconical, longer than wide; antennomeres 9–10 globulous, almost as wide as long; antennomere 9 1.06X as long as 8; antennomere 11 longest, 1.94X as long as 9, widest near base and tapering toward apex. Thorax: Pronotum 1.87X as long as wide, deeply grooved, integument smooth. Elytral striae 1 and 2 deep, 2 not reaching base of elytra; striae 3–8 not distinct (only inconspicuous rows of punctures). Apex of elytra not enlarged, without fluffy area on inner surface. Scutellum not foveate, apex not inserted between elytra at base. Prosternum lacking punctures in front of procoxae. Metasternum smooth, metanepisternum with longitudinal row of punctures. Trochanters and femora ( Fig. 8 ) glabrous; femora pedunculate, not or hardly depressed on sides; tibiae with short hairs on inner side. Tarsomere 1 not longer than wide, tarsomeres 2–3 impressed on dorsum. Abdomen: Sternites III–IV glabrous, smooth, with wide longitudinal groove; sternites V–VI almost smooth; sternite VII finely punctate with dense short hairs at apex ( Fig. 9 ). Membranous tergites dark. Sternites VIII–IX ( Fig. 22 ) without intermediate sclerite; tegmen ( Fig. 23 ) with apodeme enlarged proximally; parameroid lobes quite short with indistinct apical setae. Penis ( Fig. 24 ) weakly pointed at apex; frena missing; temones slightly longer than distal part of penis; anchor-shaped endophallic sclerite ( Fig. 24 ) with long and thick median rod and 2 lateral expansions extending forward.

Etymology. From the Latin adjective “ ater ”, meaning dark. The name refers to the dark color of the body.

Remarks. Neacratus ater belongs to the group of Neacratus with an anchor-shaped sclerite of the endophallus, as defined by Mantilleri (2017). It shares two synapomorphies with all the species of this group: the peculiar shape of the sclerite of the endophallus, with a median rod and two lateral "wings"; and the enlarged apodemes of the penis and tegmen. Within this group, it probably is allied closely to Neacratus famulus (Boheman, 1840) and Neacratus pascali Mantilleri, 2017 , sharing with these two taxa a very elongated median rod of the endophallic sclerite and the lack of sensorial pores on the sides of the head. It may be differentiated from all other known species of Neacratus by its uniformly dark body, metafemora not laterally flattened at the base, and head without sensorial pores on the sides behind the eyes.

Figures

Figs. 1–3. Neacratus species, habitus. 1) N. ater, ♂ holotype; 2) N. caballorum, ♂ holotype; 3) N. caballorum, ♀ paratype MNHN EC8684.

Figs. 4–9. Neacratus ater, ♂. 4–6) Head, dorsal, lateral, and ventral views; 7) Antenna; 8) Hind leg; 9) Abdomen, ventral view.

Figs. 22–33. Neacratus species. N. ater, ♂ holotype: 22) Sternites VII–VIII; 23) Penis; 24) Tegmen. N. caballorum, ♂ paratype MNHN EC8721: 25) Sternites VII–VIII; 26) Penis; 27) Tegmen. N. caballorum, ♀ paratypes MNHN EC8723-8724: 28–29) Epipleurites VIII; 30–31) Tergite VIII; 32) Genital tract; 33) Spermatheca.