Neacratus caballorum 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 : 787-790

Neacratus caballorum Mantilleri , new species

Zoobank.org/ urn:lsid:zoobank.org:act:D0527277-6EE1-481E-B31A-C709B56AF76F

Holotype. ♂, “ Guyane française, Montagne des Chevaux [4°44’32’’N 52°25’53’’W], 24.IV.2011, S. Brûlé, P.-H. Dalens & E. Poirier leg. / collection A. Mantilleri / holotype / MNHN EC8683” (MNHN).

Paratypes. 1 ♂, Guyane française, Montagne des Chevaux , 15.II.2009, S. Brûlé, P.-H. Dalens & E. Poirier leg. ( CAM) ; 1 ♂, idem, 5.V.2009 ( CAM) ; 1 ♀, 11.VII.2009, prép. micro. n°AM00419 ( MNHN EC8723 ) ; 1 ♀, idem, 1.VIII.2009 ( USNM) ; 1 ♀, idem, 6.III.2010 ( MNHN EC8727 ) ; 1 ♂, idem, 26. II.2011, prép. micro. n°AM00418 ( MNHN EC8721 ) ; 1 ♂, idem, 12.VI.2011 ( CMNC) ; 1 ♀, idem, 8.X.2011 ( CAM) ; 1 ♂, idem, 23.X.2011 ( CAM) ; 1 ♂, idem, 18.XII.2011 ( CAM) ; 1 ♂, idem, 24.XII.2011 ( CAM) ; 1 ♂, idem, 22.I.2012 ( MZUF) ; 1 ♀, idem, 26.II.2012 ( CAM) ; 1 ♀, idem, 27.V.2012 ( CAM) ; 1 ♂, idem, 10.VI.2012 ( CAM) ; 1 ♂, idem, 24.VI.2012 ( CAM) ; 1 ♂, idem, 11.VIII.2012 ( CAM) ; 1 ♂, idem, 7.X.2012 ( NHM) ; 2 ♀, idem, 21. X.2012 ( NHM, CAM) ; 1 ♀, idem, 24.XII.2012 ( CAM) ; 1 ♂, idem, 20.I.2013 ( CAM) ; 1 ♀, idem, 20. I.2013 ( MNHN EC8684 ) ; 1 ♂, idem, 11.II.2013 ( CAM) ; 1 ♀, idem, 24.II.2013 ( MZUSP) ; 1 ♂, 1 ♀, idem, 11.III.2013 ( CAM) ; 1 ♂, idem, 17.III.2013 ( MZUSP) ; 1 ♀, idem, 6.IV.2013 ( CAM) ; 1 ♀, idem, 19.V.2013 ( CAM) ; 1 ♂, idem, 31.VIII.2013, prép. micro. n°AM00421 ( MNHN EC8722 ) ; 1 ♂, idem, 14.IX.2013 ( MNHN EC8725 ) ; 2 ♂, idem, 21. IX.2013 ( MNHN EC8726 , USNM) ; 1 ♀, idem, 28. IX.2013, prép. micro. n°AM00420 ( MNHN EC8724 ) ; 1 ♀, idem, 28.IX.2013 ( CMNC) ; 1 ♀, idem, 12.X.2013 ( MZUF) ; 1 ♂, 1 ♀, idem, 7. XII.2013 ( CAM) ; 1 ♂, idem, 11.I.2014 ( CAM) ; 1 ♀, idem, 4.X.2014 ( CAM) .

Description of Male. Length from apex of rostrum to apex of elytra = 10.1–21.6 mm; length from apex of pronotum to apex of elytra = 7.3–14.2 mm; width across humeral calli = 1.5–3.0 mm. Brownred with 2 weak, lighter, longitudinal bands and weak, darker, post-median blotch on elytra ( Fig. 2 ). Head: Prorostrum 0.50–0.56X as long as meso- and metarostra and mesorostrum together, enlarged at apex with deep median notch, grooved at base, not carinate on sides ( Fig. 10 ). Mesorostrum with median groove. Metarostrum more or less deeply grooved on almost entire length, smooth, not carinate on sides. Eyes 1.13–1.50X as long as temples. Head smooth, separation with “neck” very distinct; large sensorial pores on sides ( Fig. 11 ); interocular fovea generally clearly distinct. Sides of metarostrum with large sensorial pores ( Fig. 11 ). Venter ( Fig. 12 ) with hairy, non-aligned, large sensorial pores; venter of metarostrum with 2 longitudinal areas with sensorial pores separated by smooth, strong, longitudinal median carina; pores reaching base of prorostrum. Antennomere 2 enlarged at apex, hardly longer than wide; antennomere 3 subconical, slightly longer than wide; antennomeres 9–10 quite globulous to subcylindrical, almost as wide as long; antennomere 9 1.33–1.50X as long as 8; antennomere 11 longest, 1.63–1.81X as long as 9, widest near base and tapering toward apex ( Fig. 13 ). Thorax: Pronotum 1.67–1.79X as long as wide, deeply grooved, integument smooth, shiny. Elytral striae 1 and 2 deep, 2 not reaching base of elytra; striae 3–8 indicated by marked rows of punctures. Apex of elytra not strongly enlarged, without fluffy area on inner surface. Scutellum not foveate, apex not inserted between elytra at base. Prosternum with few punctures in front of procoxae. Metasternum smooth or with few lateral punctures, metanepisternum with longitudinal row of deep punctures. Trochanters glabrous; femora not pedunculate, laterally compressed ( Fig. 14 ), not or hardly depressed on sides, glabrous or with few short hairs at base; tibiae hairy on inner side. Tarsomere 1 not longer than wide, shorter than 2–3 together; tarsomeres 2–3 impressed on dorsum. Abdomen: Sternites III–IV glabrous, without longitudinal groove, with deep punctures behind metacoxae and on sides of sternite IV; sternites V–VI with row of small punctures; sternite VII punctate with dense hairs at apex ( Fig. 15 ). Membranous tergites pale. Sternites VIII–IX ( Fig. 25 ) with intermediate sclerite; tegmen ( Fig. 26 ) with apodeme not enlarged proximally; parameroid lobes short, with indistinct apical setae. Penis ( Fig. 27 ) rounded at apex; frena missing or extremely reduced; temones slightly longer than distal part of penis; no endophallic sclerite ( Fig. 27 ).

Description of Female. Length from apex of rostrum to apex of elytra = 9.2–18.4 mm; length from apex of pronotum to apex of elytra = 6.7- 13.9 mm; width across humeral calli = 1.4–2.85 mm. Coloration as in male ( Fig. 3 ). Head: Prorostrum 0.90–1.39X as long as meso- and metarostra together, not notched at apex ( Fig. 16 ). Mesorostrum grooved on anterior part. Metarostrum not carinate, smooth, with weak sometimes indistinct median groove. Eyes 2.89–3.29X as long as temples. Head smooth, separation with “neck” clearly distinct; temples with row of large sensorial pores behind eyes ( Fig. 17 ); interocular fovea generally clearly distinct. Sides of metarostrum ( Fig. 17 ) with sensorial pores. Venter of head and metarostrum ( Fig. 18 ) with 2 rows of large sensorial pores reaching mesorostrum, separated by longitudinal median carina under metarostrum. Venter of prorostrum smooth, deeply notched at apex. Antennomere 2 wider than long; antennomere 3 subconical, as long as wide; antennomeres 4–8 wider than long; antennomeres 9–10 as in male, 9 1.55–1.63X as long as 8; antennomere 11 longest, 1.46–1.83X as long as 9, widest near base and tapering toward apex ( Fig. 19 ). Thorax: Pronotum as in male, 1.67–1.80X as long as wide. Scutellum and elytra as in male. Pro-, meso-, and metasterna as in male. Legs as in male, except metafemora not laterally compressed at base. Abdomen: Sternites III–VI as in male; sternite VII with superficial punctures, without dense hairs ( Fig. 21 ). Membranous tergites pale. Tergite VIII ( Figs. 30–31 ) with blunt apical teeth. Epipleurites VIII ( Figs. 28–29 ) with large gland on ventral surface. Base of coxites ( Fig. 32 ) not enlarged; 2 accessory glands inserted on genital tract, vagina without sclerotization; spermatheca ( Figs. 32–33 ) sickle-shaped, with short ductus.

Etymology. From the plural genitive of the Latin word “ caballus ”, meaning “horse”. The name refers to the type locality, “ montagne des Chevaux ” (Horses’ Mountain), where it was collected using flight interception traps following the methodology of Touroult et al. (2017).

Remarks. Neacratus caballorum can be differentiated from all other Neacratus by the following combination of characters: antennomeres 9–10 scarcely longer than wide; large sensorial pores on temples; separations between head and “neck” clearly distinct; elytra shiny, brownish with two weak orange lines; metafemora of males strongly compressed laterally at base, without tooth; endophallus without sclerite. It might be allied to Neacratus lineatus Mantilleri, 2014 from Brazil, sharing with this species most of the aforementioned characters, but in N. caballorum the orange lines on the elytra are much less obvious, the separation between head and “neck” is clearly distinct, and the male genitalia are very different (parameroid lobes glabrous, frena not distinct, no endophallic sclerites).

Figures

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

Figs. 10–21. Neacratus caballorum. ♂: 10–12) Head, dorsal, lateral, and ventral views; 13) Antenna; 14) Hind leg; 15) Abdomen, ventral view. ♀: 16–18) Head, dorsal, lateral, and ventral views; 19) Antenna; 20) Hind leg; 21) 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.