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

Tapuy-Avilés, Yarina, Díaz-Guevara, David R. & Caterino, Michael S., 2025, First record of Bibrax Fletcher, 1927 (Coleoptera, Staphylinidae, Pselaphinae) from Ecuador, with descriptions of twelve new species, ZooKeys 1250, pp. 105-133 : 105-133

publication ID

https://doi.org/10.3897/zookeys.1250.156763

publication LSID

lsid:zoobank.org:pub:C677FE28-AB0C-467F-86BA-459EF275E79E

DOI

https://doi.org/10.5281/zenodo.16950018

persistent identifier

https://treatment.plazi.org/id/B095B9DD-DBB4-5AD5-8693-B73FC6D8B2E1

treatment provided by

ZooKeys by Pensoft

scientific name

Bibrax pectinifer
status

sp. nov.

Bibrax pectinifer sp. nov.

Figs 5 C, D View Figure 5 , 6 E – H View Figure 6

Type material.

Holotype • ♂ ( MECN -EN 23776 ): “ Ecuador. Napo, Archidona. Pacto Sumaco , -0.658219, -77.59197. Malaise, 22-ene-2024. A Pazmiño | M Barreno ” / “ Caterino DNA voucher, Ext. MSC-13222, Morphosp. PS.A.004 ” / “ MECN -EN 23776 GoogleMaps . Paratypes (3 ♂ 1 ♀) • same data as type ( MECN -EN 23774 , 23777, 23775, 23778) GoogleMaps .

Diagnosis.

BL = 1.55 mm (n = 3). Body densely setose, brownish-orange; eyes of both sexes strongly reduced, borne on small prominences, comprising three or four indistinct ommatidia; head rounded posteriorly, prolonged in front of eyes to prominent antennal base, two deep depressions in lateral view: one in front of eyes and another one at vertexal fovea; antennal scape slightly sinuate, narrowed anterior to apex, antennomere II (pedicel) longer than antennomeres III – IV combined, III – VI progressively shorter, VII slightly larger, VIII small, IX and X similar sized, IX – XI forming club, antennomere XI rounded and slightly longer than antennomeres IX and X; gular teeth not prominent; pronotum with lateral lobes slightly produced, rounded, pronotum weakly constricted and gradually narrowed to base; median and lateral longitudinal pronotal impressions well developed; elytra rather short, with narrowed humeri, each with sutural and one lateral basal foveae, lateral fovea with broad longitudinal impression extending posterad; abdominal paratergites wide, projecting at posterior corners; penultimate male abdominal ventrite weakly depressed at middle with comb-like series of erect setae along apicolateral margins; last ventrite with similar setal comb less prominent. Aedeagus (Fig. 5 C, D View Figure 5 ) with basal bulb large and spherical, with pair of short, blunt basal apodemes; tegmen deeply divided into two separate processes of similar lengths, one sinuate, with concave apical margin, the other with spine-like end and curved dorsally.

Distribution.

This species is known only from the lower (~ 1500 m), southern slopes of the Volcán Sumaco, in the western Amazon, Napo Province, Ecuador.

Remarks.

This species is among the smaller, flattened species, and accordingly differs mainly in the male abdominal characters. The paired combs of setae on the last two male ventrites are unique and readily distinguish the species, although these combs may be somewhat obscured by adhering particles of dirt.

Etymology.

We name this species for its males’ ‘ comb-bearing’ abdominal sternites.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

SubFamily

Pselaphinae

Genus

Bibrax