Bibrax aratrifer, Tapuy-Avilés & Díaz-Guevara & Caterino, 2025

Bibrax aratrifer sp. nov.

Figs 2 G, H View Figure 2 , 3 E – H View Figure 3

Type material.

Holotype • ♂ ( MECN -EN 38735 ): “ Ecuador: Napo, -0.5952, -77.8994, Est. Biol. Yanayacu, Piha Tr. , 2386 m, 9.IX.2024, sifted litter, M. Caterino ” / “ MECN -EN 38735 ” GoogleMaps . Paratypes (4 ♂, 1 ♀, same general locality as type) • 1: same data as type GoogleMaps • 1: -0.5983, -77.8954, Stream Tr. , 2192 m GoogleMaps • 1: -0.5986, -77.8949, Stream Tr. , 2185 m GoogleMaps • 1: -0.5958, -77.8927, Aburrian Tr. , 2283 m GoogleMaps • 1: -0.5947, -77.8945, Piha Tr. , 2248 m ( MECN -EN 38736 -38739, 41045 View Materials ) GoogleMaps .

Diagnosis.

BL = 1.32 mm (n = 3). Eyes of both sexes with single facet, head subquadrate posteriorly, prolonged in front of eyes, deeply depressed at vertexal foveae, slightly elevated posteriorly; antennal base prolonged and narrowed anterad; antennal scape sinuate, narrowed to base and before apex, flagellomeres II – VI progressively shorter, VII slightly larger, VIII small, IX – XI forming weak, loose club; pronotum with lateral lobes rounded, median and lateral longitudinal pronotal sulci well developed; elytra very short (flightless in both sexes), together emarginate along posterior margin, each with single distinct, median basal fovea, with short longitudinal elytral sulci short extending posterad; male with visible abdominal ventrite 2 elevated at middle, elevation posteriorly concave, densely setose; male ventrites 3 and 4 simply depressed medially; other secondary sexual characters not evident. Aedeagus (Fig. 2 G, H View Figure 2 ) with large basal bulb with round dorsal diaphragm, bulb ventrally bearing strong basal shelf (which articulates internally with sternite 6); tegmen constricted at base, appearing articulated with basal bulb, bent strongly laterad, thence narrowing evenly distad, apex with very small spatulate tip.

Distribution.

This species is known only from the cloud forests of the Yanayacu Biological Station, Napo province, Ecuador.

Remarks.

Among the smaller, flattened, and flightless species mentioned previously, the unique, elevated, curved transverse ridge on male ventrite 2 easily distinguish this species.

Etymology.

The name of this species refers to this abdominal modification, meaning in Latin ‘ plow-bearing’.