Exalphus hefferni Audureau (2017) : 2

Silva Júnior, José O., Haseyama, Kirstern L. F. & Souza, Diego de S., 2021, Phylogenetic approach redefines Plistonax (Coleoptera, Cerambycidae, Lamiinae) with new combinations and a new genus of flat-faced long-horned beetles, Organisms Diversity & Evolution (New York, N. Y.) 21 (2), pp. 491-520 : 511-512

Exalphus hefferni Audureau (2017): 2 , fig. 4. Plistonax hefferni Silva Júnior et al. (2019): 395 (comb. nov.); Monné (2021) (cat).

Type locality: holotype (male) – Colombia, Muzo region ( AACP, destined to MNHN) .

Diagnosis. Median-basal crest on elytron straight ( Fig. 1e ), formed by prominent tubercles, separated from each other.

Distribution. Colombia [Boyacá] (Fig. S4b).

Remarks. This species has been recently transferred to Plistonax by Silva Júnior et al. (2019), which also corrected the sex of the holotype (assinaled as female in the original description). P. hefferni can be distinguished by median-basal crest discontinued, formed by flattened and prominent tubercles, a unique feature in the genus. The central white stain on the elytra is similar to P. albituberculatus . Species known only by the type specimen from Colombia.

Figures

Fig. 1 Character illustrations: a 1:0 male’s gena with margin curved (anterior view, Plistonax inopinatus). b 1:1 male’s gena with margin straight (anterior view, Aegomorphus jaspideus). c 3:0 scape slightly expanded to the mid-region (dorsal view, Ateralphus dejeani). d 3:1 scape strongly expanded in the mid-region (dorsal view, P. inopinatus). e 25:0 elytron with median-basal crest reaching no more than the half and 26:0 median-basal crest with anterior region straight (dorsal view, P. albituberculatus). f 25:1 elytron with median-basal crest reaching beyond the half and 26:1 median-basal crest with anterior region curved (dorsal view, P. inopinatus). g 19:0 prosternal process with lateral margin concave (ventral view, Steirastoma breve). h 19:1 prosternal process with lateral margin straight (ventral view, P. rafaeli). i 19:2 prosternal process with lateral margin convex (ventral view, P. inopinatus). Red arrows highlight the character states 1:0 and 1:1. Mbc, median-basal crest. Scale bars: 1 mm