Belicinus rhomboideus Arce-Pérez & Shepard, 2012

Chacón-Hartleven, Erick A., Luna-Luna, Alba Magali, Chamé-Vázquez, Eduardo R., Mejía-González, Gamaliel & Contreras-Ramos, Atilano, 2025, A new species of Psephenops Grouvelle, 1898, with new distribution data and habitat notes of the psephenine water-penny beetles from Mexico (Coleoptera: Psephenidae: Psepheninae), Zootaxa 5722 (1), pp. 79-94 : 81

Belicinus rhomboideus Arce-Pérez & Shepard, 2012

Figs. 1–4

Diagnosis. Adult male ( Figs. 1, 2 ): body oval and depressed, with widespread vestiture of long and short setae, longer and darker on venter. Head long with a longitudinal furrow on postoccipital region, concave between the eyes; eyes spherical, very prominent; clypeus subtrapezoidal; antennae short, filiform to subserrate, hardly reaching scutellum. Maxillary palpus short, with 4 palpomeres, three basal ones subconical, apical palpomere ovoid. Pronotum trapezoidal, anterior margin arcuate, posterior margin bisinuate and almost as wide as elytral base, lateral margins rounded and unexpanded; with a longitudinal glabrous line and a weak carina on distal half, with a slight depression on each side. Male genitalia: Trilobate, ventrally subrectangular; parameres subtrapezoidal, shorter than middle lobe, with external margin slightly sinuate, ending in a truncate and emarginate apex ( Fig. 3 ); penis in ventral view with expanded rhomboidal shape, with small spines on surface ( Fig. 4 ).

Material examined. MEXICO: Chiapas: Marqués de Comillas, Río Lagartos , 16°07’32.91”N, 90°54’35.42”W, 150 m, 10.i.2017, Barba, López, Benítez, 2 males, D net ( CNIN); same data except 30.i.2019, Barba, 1 male ( CNIN) .

Geographical distribution. BELIZE, Belize, Cayo, Orange Walk, Stann Creek, and Toledo districts. MEXICO, Chiapas, first country record .

Figures

FIGURES 1–8. Adult males, habitus (dry specimens) and genitalia (glycerin). 1) Belicinus rhomboideus, body dorsal; 2) B. rhomboideus, body ventral; 3) B. rhomboideus, genitalia dorsal; 4) B. rhomboideus, genitalia ventral; 5) Psephenopalpus browni, body dorsal; 6) P. browni, body ventral; 7) P. browni, genitalia dorsal; 8) P. browni, genitalia ventral.