Drosophila quijos, Guillín & Rafael, 2015

Guillín, Emily Ramos & Rafael, Violeta, 2015, Three new species of Drosophila tripunctata group (Diptera: Drosophilidae) in the eastern Andes of Ecuador, Revista peruana de biología 22 (3), pp. 289-296 : 292-295

Drosophila quijos sp. nov.

( Figs. 13 − 18 )

Type material. Male holotype (dissected, terminalia in microvial), labelled “ D. quijos Holotype ♂, E. L. Ramos & V. Rafael det. 2014 Ecuador, Napo, Cordillera de los Guacamayos, 00°22’52.6”S, 78°09’44.4”W, 3362 m). II. 16/05 /2012, E.L.

Ramos col., ( QCAZI 3001 ). Paratype: 1♂ (dissected, terminalia in microvial), with same data as holotype ( QCAZI 3002 ).

Diagnosis. Aristae plumose, right arista with 8 dorsal and 3 ventral branches and 7 dorsal and 3 ventral branches on the left, plus the terminal fork. Abdomen yellow with dorsal midline; tergite 1 with little pigmentation on the lower part of the tergite (without dorsal midline); tergites 2 − 5 with dark brown lateral bands which increase in wide apically and slightly narrowed laterally. Apex of aedeagus with a wide invagination and dorsally with a voluminous projection with bright studs. Aedeagal apodeme sclerotized (broken in the paratype). Paraphyses long with two pedunculated setae.

Description. Head. Frons brown, frontal length 0.45 mm (0.47); frontal index= 0.80 (0.86), top to bottom width ratio= 1.48 (1.40). Frontal triangle yellowish brown. Ocellar triangle dark brown, ocellus yellow. Orbital plate brown, the medial vertical seta is closer to lateral vertical setae and slightly towards the outer edge of the orbital plate, distance of or3 to or1 8% (10%) of or3 to vtm 15% (15%), or1/or3 ratio 0.73 (0.70), or2/ or1 ratio 0.60 (0.62), postocellar setae 66% (65%) and ocellar setae 82% (80%) of frontal length; vt index= 1.10 (1.0), vibrissal index= 0.52 (0.50). Frontal vitta brown. Gena and postgena yellowish brown. Carina yellow, prominent, not sulcate. Cheek index = 10.85 (9.21). Eyes wine red; eye index = 1.31 (1.33). First flagellomere yellowish brown. Aristae plumose, right arista with 8 dorsal and 3 ventral branches and 7 dorsal and 3 ventral branches on the left, plus terminal fork. Proboscis yellow.

Thorax. Brown; length 0.87 mm (0.81) with 6 rows of acrostic setulae between the two anterior dorsocentral setae, h index= 0.89 (0.80). Transverse distance of dorsocentral setae 2.0 (1.98) of longitudinal distance, dc index = 0.80 (0.83). Scutellum brown. Distance between apical scutellar setae 92% of that between apical and basal setae; basal scutellar setae divergent; scut index= 1.01 (1.30). Sterno index= 0.63 (0.71), median katepisternal setae slightly smaller than the previous one. Legs yellow.

Wings beige, posterior crossvein slightly infuscate, length 3.77 mm (3.90), length to width ratio= 2.11 (2.0). Indices: C= 4.09 (4.0); ac= 2.16 (2.3); hb= 0.23 (0.30); 4c= 0.50 (0.54); 4v= 1.16 (1.0); 5x= 1.20 (1.02); M= 0.32 (0.45); prox.x= 0.33 (0.43).

Abdomen ( Fig. 13 ). Yellow with dorsal midline; tergite 1 with little pigmentation in the distal part of the tergite and without dorsal midline; tergites 2 − 5 with dark brown lateral bands which increase in width apically and slightly narrowed laterally; tergite 6 pigmented entire width and length.

Length (body + wings), 4.64 mm (4.82).

Male terminalia ( Figs. 14 − 15 ). Epandrium microtrichose with 2 long lower setae. Cerci not linked to epandrium. Cerci microtrichose with long setae. Surstylus sclerotized with a row of 12 prensisetae on the left and 14 on the right, 9 inner setae on the right and 10 on the left. There were two groups of outer setae: 6 inward and 19 outward. Hypandrium shield − shaped with sclerotized edge (broken in the paratype).

Aedeagus ( Figs. 16 − 18 ). Sides of the aedeagus sclerotized with two lateral and serrate projections. Apex with a wide invagination and dorsally with a voluminous projection with bright studs near to the lateral projections. Aedeagal apodeme sclerotized (broken in the paratype). Paraphyses long with two pedunculated setae.

Etymology. Named after the Quijos region of Napo Province,

Ecuador where the specimens were collected.

Relationship to other species. The general shape of the male terminalia, especially the aedeagus, suggests a close relationship to D. bandeirantorum in the tripunctata group.

Figures

Figures 13 – 18. Drosophila quijos sp. nov. (13) abdomen (scale bar = 1mm); (14) epandrium, cerci, surstyli and decasternum; (15) hypandrium and broken gonopods in ventral view; (16 – 18) aedeagus, paraphyses and broken gonopods in dorsal, lateral and ventral view, respectively (scale bar = 100µm).