Eugenys singularis, Jaume-Schinkel & Kvifte, 2024

Jaume-Schinkel, Santiago & Kvifte, Gunnar Mikalsen, 2024, Revision of the genus Eugenys Quate, 1996 (Diptera: Psychodidae), with the description of three new species, European Journal of Taxonomy 935, pp. 81-100 : 90-93

Eugenys singularis sp. nov.

urn:lsid:zoobank.org:act:AA14FE8F-5A54-430F-9D08-56AC089FFB68

Figs 1 , 3F , 6

Differential diagnosis

This species can be easily differentiated from all other species of Eugenys by the hypopods with a lateral digitiform projection (hypopods without lateral projection in remaining species).

Etymology

The species epithet is derived from the Latin ‘ singulāris ’, referring to the unusual shape of the lateral projection of the hypopods.

Material examined

Holotype COSTA RICA – Heredia • ♂; Puerto Viejo de Sarapaquí , Est. Biol. LaSelva ; alt. 50–100 m; 1 Dec. 1993; Malaise trap M/00/009; INBIO-CRI001470242 ; LACM.

Paratypes COSTA RICA • 1 ♂; same collection data as for holotype; INBIO-CRI001470896 ; LACM .

Description

Male

MEASUREMENTS (in mm; n = 2). Wing length 1.8 (1.8–1.8), width 0.89 (0.89–0.90); head length 0.35 (0.32–0.38), width 0.40 (0.40–0.40); antennal segments, scape 0.09 (0.08–0.10), pedicel 0.05 (0.05– 0.06), flagellomeres 1: 0.09 (0.09–0.10), 2–13: 0.08 (0.08–0.09), flagellomere 14: 0.09; palpomeres 1: 0.04 (0.04–0.05), 2: 0.06 (0.06–0.06), 3: 0.05 (0.05–0.05), 4: 0.04 (0.04–0.04).

HEAD. Slightly wider than long; eye bridge contiguous, eye bridge with three facet rows; no enlarged alveoli on postocular area; interocular suture non-discernible in examined material ( Fig. 6A ). Antenna with scape cylindrical, about 2 × as long as pedicel; pedicel spherical; 14 flagellomeres, 1–13 fusiform, flagellomere 14 elongated, slightly longer than flagellomere 13, ending in digitiform apiculus, flagellomeres without patch of darkened sensilla; ascoids lanceolate, about 2 × as long as flagellomere carrying them; frontal alveoli patch square, lower margin with concavity in middle; mouthparts reduced, not extending beyond margin of head. Palpal segments short and sclerotized, apical segment not corrugated; not extending more than half of flagellomere 4, palpal proportions 1.0:1.4:1.1:1.0.

THORAX. Without allurement organs; wing length about 2 × its width, hyaline, with alveoli on entire surface; Sc vein almost straight, ending at about origin of R 5, fork of R 2+3 basal to M 1+2, R 2+3 joining R 4, wing apex rounded, R5 ending at wing apex.

TERMINALIA. Hypandrium narrow, plate-like; gonocoxites cylindrical, about two-thirds length of gonostyli; gonocoxites joining in middle, and together giving origin to semi-sclerotized parameral sheath protruding beyond aedeagus, covering aedeagus only on sternal surface (see Fig. 6B, D ); gonostyli digitiform, tapering towards apex, with rounded apex, outwardly curved; ejaculatory apodeme about 2 × as long as aedeagus, narrow but broadening towards basal margin; aedeagus digitiform and tapering towards the apex, apex pointed; parameral sclerites fused, forming single Y-shaped sclerotized segment, linked to aedeagal sheath and aedeagus; epandrium not discernible in examined material; hypopods cylindrical, with outer laterally curved projection ( Fig. 6C, E ), lateral projection carrying two apical tenacula, while margin prior to projection in apex of hypopods carries 12–14 tenacula, all tenacula with rounded apex; epiproct v-shaped, covered in small setulae.

Female

Unknown.

Distribution

Only known from the type locality in Costa Rica.

Genetics

No specimens were available for sequencing.

Figures

Fig. 1. Distribution map of the species of Eugenys Quate, 1996.

Fig. 3. Male genitalia, ventral view. A. Eugenys cymosa Quate, 1999, paratype (BMNH(E)2001-8). B. Eugenys panamensis Quate, 1999, paratype (BMNH(E)-2001-8). C. Eugenys clavellata Quate, 1996, paratype (USNMENT00857092). D. Eugenys upsilon sp. nov., holotype (ZFMK-DIP-00097918). E. Eugenys micra sp. nov., holotype (ZFMK-DIP-00097917). F. Eugenis singularis sp. nov., holotype (INBIO-CRI001470242). Red arrows point to the parameral sclerites. Photos: A–B, D–F by Santiago Jaume-Schinkel, C by David Pecor, Smithsonian Institute Museum. Scales in millimeters (mm).

Fig. 6. Eugenys singularis sp. nov., ♂, holotype (INBIO-CRI001470242). A. Head. B. Aedeagus, gonocoxites and gonostyli (ventral view). C. Hypopods (ventral view). D. Aedeagus, gonocoxites and gonostyli (ventral view). E. Hypopods. Scales in millimeters (mm). Abbreviations: see Material and methods.