Didicrum naimae Omad

Omad, Guillermo, 2014, Two new species of Didicrum Enderlein (Diptera, Psychodidae, Psychodinae) from Argentinean Patagonia, Zootaxa 3794 (4), pp. 565-574 : 566-568

Didicrum naimae Omad , sp. nov.

( Figs. 1–13 )

Description. Male ( Figs. 1–8 ). Head ( Fig. 1 ): about as long as broad (without considering mouthparts), oval in frontal view; supra-ocular frontal and vertex area 4.1 times as high as eye-bridge width; intraocular suture inverted V-shaped but interrupted in center; eye-bridge with 3 rows of facets separated by 2.5 facet diameters; front below eyes broad, with a broad seta alveoli patch below entending uniformly without dorsal extension; clypeal region broad with oval patch of sparse alveoli; palpus long, 0.55 the length of antenna ( Fig. 3 ); palpal formula 1.0: 1.4: 2.0: 2.6; mouth parts very short, 0.4 times the head high ( Fig. 1 ); labella bulbous with short spiniform pointed setae on distal margin and long setae on anterior margin; antenna short, 0.4 times as long as wing; scape twice longer than the globular pedicel ( Fig. 4 ), with 14 flagellomeres, flagellomere 1–2 barrel shaped, flagellomere 3–11 flaskshaped, last 3 reduced ( Fig. 5 ), ascoid small with four branches (sometimes few ascoids could have 5 branches); apical flagellomere with a capitate apiculus which is a long as node ( Fig. 5 ).

Thorax: Wing ( Fig. 2 ) 2.2 times as long as broad; Sc short; radial fork basad to medial fork, R5 ending beyond wing apex; R2+3 not attached to R4.

Terminalia: ( Figs. 6–8 ) Hypandrium a band between bases of gonocoxites, modified with multiple short triangular projections as a comb. Gonocoxite ( Fig. 6 ) shorter than gonostylus, with strong setae uniformly distributed; gonostylus wide at the base with patch of setae alveoli in the external margin, tapering towards the tip, ending in a soft hook with a small spine in the concave side of the hook; anterior gonocoxal apodemes plate like, somewhat triangular, not touching at middle; distiphallus wide at the base, tapering at the tip, spears ending; basiphallus short, as the same length of the gonocoxite, anterior apex square; aedeagus black, single, bare, curved at the base, tapered at the end, as long as the gonocoxite ( Fig. 6 , 8 ); epandrium barely visible, posterolateral angles rounded, posterior margin concave, leaving the rounded, small tergum 10 visible ( Fig. 7 ); sternum 10 nearly triangular, as long as the gonocoxite, with small hair like seta along its entire surface; surstylus long, 3 times longer than the gonostylus, slightly curved, with strong spiniform setae at the base and setae alveoli over all its surface, with one apical rounded tenaculum ( Fig. 7 ).

Measurements. Head height 0.56, width 0.45; mouthparts length (from clypeus inferior border to apex of labellum) 0.12; palpus length 0.56; antenna length 1.05; wing length 2.5, width 1.10; epandrium length (barely visible) 0.12; surstylus length 0.35, apical tenaculum length: 0.06; gonostylus length: 0.14; gonocoxite length: 0.12; aedeagus length: 0.11; basiphallus length: 0.12, distiphallus length: 0.13. All measurements are in mm.

Female ( Figs. 9–14 ). Similar to male except for the following characteristics. Head: eye-bridge separated by 3 facet diameters ( Fig. 9 ); palpus long, 1.2 the length of the head ( Fig. 11 ), palpal formula: 1.0: 1.6: 2.4: 2.4; antenna (last 7 flagellomere) ( Fig. 12 ), scape and pedicel ( Fig. 13 ) and wing ( Fig. 10 ) as figured. Postabdomen ( Fig. 14 ): subgenital plate nearly triangular; hypovalve setose, with two rounded lobes leaving a triangular intermediate space; chitinous arch wide, rounded, coinciding the anterior margin of the hypovalve; genital pouch visible, bowshaped; longitudinal struts well developed, genital ducts rounded with a sets of small ribs ( Fig. 14 ); cercus two times long as the subgenital plate, wide at the base, then tapering toward the distal portion.

Measurements. Head high: 0.50, width: 0.46; mouthparts length (from clypeus inferior border to apex of labellum): 0.10; palpus length: 0.59; antenna length: 1.21; wing length: 3.10, width: 1.27; subgenital plate length (from anterior margin to apex of hypovalve): 0.17; cercus length: 0.35. All measurements in mm.

Material examined. ARGENTINA: Río Negro, Nahuel Huapi National Park, Arroyo Blanco (40º 39’ 3.4’’ S, 71º 24’ 45.8’’ W, 822 m asl), Malaise trap, 3–21.i.2008, Garré and Montes de Oca, leg. 1 ♂ (holotype), 1 ♀, 2 ♂ (paratype); Nahuel Huapi National Park, Río Neuquenco (40º 28’ 48.3’’ S, 71º 36’ 44.1’’ W, 809 m asl) Malaise trap, 20.xii.2007 – 9.i.2008, Garré and Montes de Oca, leg. 1 ♂, 1 ♀ (paratype); Nahuel Huapi National Park, Río Frias (41º 05’ 14.8’’ S, 71º 48’ 20.9’’ W, 765 m asl), Malaise trap, 14 – 24.ii.2008, Garré and Montes de Oca, 1 ♀ (paratype); Chubut, Los Alerces National Park, Río Frey (42º 51’ 49.3’’ S, 71º 44’ 29.9’’ W, 750 m asl) Hand net, 28.xii.2011, Omad, leg. 1 ♂ (paratype).

Etymology. The specific epithet naimae is after Naíma Omad, one of the dearest nieces of the author.

Figures

FIGURES 1 – 6. Didicrum naimae Omad, sp. nov., male (holotype). 1. Head frontal view. 2. Wing. 3. palpus. 4. scape, pedicel and first flagellomere. 5. Antenna, last 5 flagellomeres. 6 - 8. Male Terminalia. 6. terminalia in part showing the hypandrium, aedeagus, distiphallus, basiphallus and gonopods, both gonocoxites, one gonostylus; anterior gonocoxal apodemes. All measures in mm.

FIGURES 7 – 8. Didicrum naimae Omad, sp. nov., male (holotype). 7. Terminalia in part showing the posterior margin of epandrium, tergum 10, sternum 10, cercus and the apical tenaculum. 8. Aedeagal complex in part showing the aedeagus and the distiphallus. All measures in mm.

FIGURES 9 – 14. Didicrum naimae Omad, sp. nov., female. 9. Head frontal view. 10. Wing. 11. Palpus. 12. Antenna in part, showing the last 7 flagellomeres. 13. scape and pedicel. 14. Postabdomen. All measures in mm.