Rhyncheros LeConte, 1881

González-Ramírez, Mireya, Zaragoza-Caballero, Santiago, Morrone, Juan J. & Ochoterena-Booth, Helga, 2025, A phylogenetic analysis based on morphology reveals the placement of Lycomesus Zaragoza-Caballero & González-Ramírez, 2019 and Lyconotus Green, 1949 within Lycini (Coleoptera: Lycidae), with the description of a new genus from North America, European Journal of Taxonomy 1022, pp. 202-242 : 225-226

Genus Rhyncheros LeConte, 1881

Figs 4D, H–J, T–U, W, 5A–B, E, N, 6A, D, G–I, O, Q–R, 7C, F, H–I, M, 9F–G

Rhyncheros LeConte, 1881: 17 .

Thoracocalon Bourgeois, 1883 : lxi.

Type species

Lycus sanguinipennis Say, 1823 .

Diagnosis

General appearance similar to Lycorectus gen. nov. but differs in the shape of the abdominal sternites with acute posterior angles; in males the posterior border of the seventh sternite is concave or emarginate ( Fig. 6H–I); aedeagus with parameres of variable length, phallus widened at base, straight to slightly curved at apex, in some species, the phallus lacks thorns, in other instances, however, these structures are clearly present ( Fig. 7C, F, H–I).

Material examined

Refer to Supp. file 1.

Redescription

Body slender. Head mostly concealed by pronotum, rostrum variable in length (moderately short, often very long) ( Fig. 4H–J). Interantennal distance variable in length (less than 0.09 mm to more than 0.13 mm) ( Fig. 4D). Antennomere III longer than antennomere IV. Variable labrum shape (semi-circular, semi-square to rectangular) ( Fig. 4L). Mandibles as long as labrum. Pronotum widest at base, with variable anterior border shape (rounded to strongly angulated) ( Figs 4W, 5A–B), and variable anterior margins shape (not prominent to prominent) ( Fig. 4T–U), wide pronotal margin ( 0.53–0.81 mm, often more than 0.82 mm). Elytra without sexual dimorphism, with four distinct costae on each elytron ( Fig. 9F–G). Radiomedial loop slightly curved ( Fig. 5N). Trochanters with rounded internal angle ( Fig. 6A), metatibial spurs equal, acute and long ( Fig. 6D, G). Male with straight last sternite. Male genitalia with variable shape of parameres (moderately long, often short), phallus slightly widened at base, straight to slightly curved at apex, with diminutive and transparent keel on ventral part, phallus thorns may or may not be present and variable in length ( Fig. 7C, F, H–I). Female genitalia with variable length of stylus, coxites and valvifers fused, with robust coxites and elongated shape, valvifers not fused at base ( Fig. 7M).

Distribution

Rhyncheros is distributed in the Neartic and Neotropical regions. It has been reported in southern United States as well as in Mexico ( Dugés 1878, 1896; Gorham 1880, 1884; Green 1949; Pérez-Hernández et al. 2019; GBIF 2023b).