Teramocerus pachyodon Mantilleri, 2016

Mantilleri, Antoine, 2016, Two New Species and New Records of Acratini (Coleoptera: Curculionoidea: Brentidae), The Coleopterists Bulletin 70 (2), pp. 243-248 : 245-247

Teramocerus pachyodon Mantilleri , new species

Holotype. ♂, Panama, Bocas del Toro, 40 km W Chiriqui Grande [8°57′N 82°30′W], 10.V.1999, Morris & Wappes, prép. micro. n°AM-CMNC00001 ( CMNC).

Paratypes. 1 ♀, idem holotype, prép. micro. n°AM-CMNC00003 ( CMNC) ; 1 ♀, Prov. Limón, R. B. Hitoy Cerere [9°39′N 83°05′W], valle de la Estrella, Send. Espavel, 560 m, 27.VI-2.VII.2003, B. Gamboa, E. Rojas & W. Arana, trampa de luz mercurio ( INBIO) ; 1 ♀, idem, 23-27.IX.2003, prép. micro. n°AM-INBIO00002 ( INBIO) .

Description of Male. L e n g t h f r o m t i p o f rostrum to apex of elytra 28.1 mm; length from front margin of pronotum to apex of elytra 16.5 mm; width across humeral calli 2.4 mm. Head, pronotum, and elytra with greenish and bronze metallic glints; rostrum, antennae, and legs reddish ( Fig. 3 ). Head: Prorostrum about 2X shorter than mesorostrum and metarostrum together, not grooved, carinate on sides at base ( Fig. 12 ). Mesorostrum weakly elevated, hardly grooved. Metarostrum with longitudinal median carina, weakly carinate on sides. Eyes shorter than temples. Head not grooved, slightly tapering backwards, with deep interocular fovea; collar constriction not strongly marked. Sides of head and metarostrum ( Fig. 13 ) with large sensorial pores; venter ( Fig. 14 ) with numerous large sensorial pores reaching base of mesorostrum, without median carina or groove. Venter of prorostrum smooth. Antennae ( Fig. 15 ) with antennomeres 2–8 much longer than broad, subconical, with long, brownish setae; 9–10 slightly longer than 8. Thorax: Pronotum 2.5X longer than broad, not punctate. Elytra not depressed at base of interstria 5. Interstria 3 elevated on declivity. Apex of each elytron ( Figs. 17–18 ) extended as 1 large, massive tooth formed by interstriae 9–11, interstria 3 hardly connected to 9. Prosternum not depressed in front of bulging procoxae, with few large punctures in front of them. Mesothorax punctate on sides and in front of mesocoxae. Mesanepisternum with coarse punctures; mesepimeron with few large punctures. Metanepisternum with longitudinal line of shallow punctures.Meso- and metacoxae with small tuft of setae, trochanters with 1 or 2 raised yellowish setae; femora very long, metafemora with stiff setae on venter side; first tarsomere shorter than 2–3 together; first metatarsomere ( Fig. 16 ) carinate on upper side; tarsomere 2 longer than broad. Abdomen: Sternites III–VII almost smooth and glabrous (few setae at apex of sternite III), with median groove on sternite III and base of IV ( Fig. 19 ). Sternites VII–VIII as in Fig. 23 . Tegmen ( Fig. 25 ) with parameroid lobes elongate, rounded at apex with few short apical setae. Internal sac of penis ( Fig. 24 ) with 3 types of sclerifications: proximally, 1 large sclerite rounded at apex, base with hole allowing insertion of ejaculatory duct; posteriorad, numerous tiny spicules on wall of sac; apically, 1 cluster of large, pointed spicules.

Description of Females. Length from tip of rostrum to apex of elytra 20.4–23.3 mm; length from front margin of pronotum to apex of elytra 14.3–16.6 mm; width across humeral calli 2.2– 2.6 mm. Pattern of coloration as in males. Habitus as in Fig. 4 . Very similar to female of Teramocerus forficula (Soares and Scivittaro, 1972). Differs only by shape of apical tooth of elytra (less acute, larger, and formed by interstriae 9–10), by tergite VIII with more apical teeth (9–10 instead of 6–7), and by genitalia ( Figs. 26–28 : vagina sclerified, but less strongly).

Etymology. From the Greek “pachy-”, meaning massive, and “odon”, tooth; refers to the large and massive tooth at the apex of each elytron.

Distribution. The specimens of the type series all originated from the same region (northwestern Panama and eastern Costa Rica) on the Caribbean slopes of the Talamanca Range.

Affinities. Teramocerus pachyodon is closely allied to T. forficula from the Amazonian Basin as it shares with this species several synapomorphies: sides of male metarostrum with distinct sensorial pores; male abdomen with few setae at apex of sternite III; base of single proximal sclerite of internal sac of aedeagus with a hole where ejaculatory duct is branched; and females with sclerotized vagina. It should be noted that this clade had been grouping up to now five species ( Mantilleri 2015a) restricted to the Amazonian Basin ( French Guiana, Brazil, and Peru). Teramocerus pachyodon could be con- sidered a vicariant species in Central America, maybe the sister-species of T. forficula. It is differentiated from this species by the more massive apical tooth of the elytra, the carina on the upper side of the first metatarsomere of the male, and the shape of the single proximal sclerite of the penis, which is pointed in T. forficula and rounded at the apex in T. pachyodon .

Figures

Figs. 1–4. Acratini, habitus. 1) Parateramocerus rondonianus, ♂ holotype; 2) P. rondonianus, ♀ paratype;

Figs. 12–19. Teramocerus pachyodon, ♂. 12) Head, dorsal view; 13) Head, lateral view; 14) Head, ventral view; 15) Antenna; 16) Metatarsomeres; 17) Apex of right elytron, dorsal view; 18) Apex of left elytron, lateral view; 19) Abdomen.

Figs. 20–28. Acratini, genitalia. 20–22) Parateramocerus rondonianus, ♂ holotype: 20) Sternites VII-VIII; 21) Penis; 22) Tegmen. 23–25) Teramocerus pachyodon, ♂ holotype: 23) Sternites VII-VIII; 24) Penis; 25) Tegmen. 26–28) T. pachyodon, ♀ paratype: 26) Tergite VIII; 27) Genital tract (cox, coxites; scl, vaginal sclerification; spm, spermatheca; sty, stylus; vag, vagina); 28) Epipleurites VIII.