Parmakanthion, Heffern & Santos-Silva, 2022

Heffern, Daniel & Santos-Silva, Antonio, 2022, A new genus and species of American Parmenini, and notes on Estola freyi Breuning (Desmiphorini) (Coleoptera, Cerambycidae, Lamiinae), Zootaxa 5125 (5), pp. 589-595 : 590

Parmakanthion gen. nov.

Type species: Parmakanthion profundum sp. nov., here designated.

Etymology. The first four letters of „ Parmena “ (type genus of Parmenini) + the Greek word “akanthion” (ἀκᾰìνθῐον; from “akantha” (“ᾰ̓ìκᾰνθᾰ”; spine) + diminutive suffix “-ιον” (-ion)). Allusive to the spines at apex of abdominal segments. Neuter gender.

Description. Form moderate-sized, convex. Frons transverse, elongate; genae distinctly longer than lower eye lobe, sides almost parallel-sided; eyes moderately coarsely faceted, upper eye lobes widely separated. Antennae distinctly longer than body in both sexes; scape cylindrical, slightly longer than prothorax, ventral surface slightly sinuous; antennomeres filiform; antennomere III not sinuous, without apical modification; basal antennomeres with long, erect, moderately sparse setae ventrally. Prothorax transverse, with large conical lateral tubercle placed medially, with apex slightly directed upward. Pronotum with one large, conical tubercle on each side of anterior half, another distinctly less elevated on center of posterior half. Prosternal process with its narrowest area about 0.25 times procoxal cavity. Scutellum with apical sides strongly elevated. Elytra moderately elongate, strongly narrowed from middle toward apex; apex subtruncate, with long spine at outer angle; centrobasal crest gradually elongated, elevated from base to its apex, abruptly sloped apically, tuberculate and glabrous; with two elevated, partially tuberculate, longitudinal carina on sides of dorsal surface, starting between centrobasal crest and lateral curvature and ending about posterior third; with another longitudinal carina from about middle to near apex, placed between suture and innermost lateral carina; with slightly elevate, longitudinal setose tubercle close to apex of second longitudinal carina, and a slightly distinct setose gibbosity on base of innermost longitudinal carina ( Fig. 5 ). Femora pedunculate-clavate. Metatarsus about as long as metatibia. Abdominal tergite 5 ( Figs 1 , 8, 10, 11 ) without apical spiniform projection on each side; ventrite 5 with long apical spiniform projection on each side in both sexes; central area of ventrite 5 in male from 1.0 ( Fig 7 ) to 1.5 times ( Fig. 2 ) length of ventrite 4; in female ( Figs 9, 10 ), slightly longer than twice length of 4.

Remarks. Parmakanthion gen. nov. is similar to Neoplectrura Chemsak & Linsley, 1983 (see photographs on Bezark 2022), but differs as follows: frons slightly wider than long; antennomere III not sinuous; elytral apex distinctly spiniform at outer angle, and subtruncate toward sutural angle; and apex of ventrite 5 with long spine on each side. In Neoplectrura , the frons is strongly wider than long, antennomere III is sinuous, the elytral apex is uniformly narrowed, not forming a distinct isolated spine at outer angle, and the apex of the ventrite 5 has no spine on each side. At least some of these features may be only specific variations. However, the presence of spines on the ventrite 5 is a very conspicuous differential feature.

Figures

FIGURES 1–5. Parmakanthion profundum sp. nov., holotype male: 1) Dorsal habitus; 2) Ventral habitus; 3) Lateral habitus; 4) Head, frontal view; 5) Elytral sculpturing.

FIGURES 6–11. Parmakanthion profundum sp. nov. 6–7) Paratype male: 6) Dorsal habitus; 7) Ventral habitus. 8–10) Paratype female: 8) Dorsal habitus; 9) Ventral habitus; 10) Ventrite 5. 11) Holotype male, ventrite 5.