Drosophila cuyuja, 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

Drosophila cuyuja sp. nov.

( Figs. 7 − 12 )

Type material. Male Holotype (dissected, terminalia in microvial), labelled “ D. cuyuja Holotype ♂, E. L. Ramos & V. Rafael det. 2014 Ecuador, Napo, Papallacta (opposite to Papallacta Lake ), 00°22’52.6”S, 78°09’44.4”W, 3362 m). II. 11/11 /2012, E.L. Ramos col., ( QCAZI 3003 ).

Diagnosis. Aristae plumose, right arista with 4 dorsal and 2 ventral branches and 3 dorsal and 2 ventral branches on the left, plus terminal fork. Abdomen beige; tergite 1 with less pigmentation; tergite 2 with a median pigmented triangular spot, tergites 2 − 4 with a dark pigmented hourglass shape. Aedeagus sclerotized with two crests serrated laterally on the ventral part and two membranous projections with striae on the upper dorsal part.

Description. Head. Frons yellowish brown, frontal length 0.43 mm; frontal index = 0.84, top to bottom width ratio = 1.68. Frontal triangle yellow. Ocellar triangle yellowish brown, ocellus yellow. Orbital plate yellowish brown, the medial vertical seta was closer to lateral vertical seta and slightly towards the outer edge of the orbital plate, distance of or3 to or1 7% of or3 to vtm 16%, or1/or3 ratio 0.52, or2/or1 ratio 0.55, postocellar setae 67% and ocellar setae 88% of frontal length; vt index = 0.89, vibrissal index = 0.57. Frontal vitta yellow. Gena and postgena yellow. Carina yellow, prominent and not sulcate. Cheek index = 8.11. Eyes wine red; eye index = 1.35. First flagellomere yellow. Aristae plumose, right arista with 4 dorsal and 2 ventral branches and 3 dorsal and 2 ventral branches on the left, plus the terminal fork. Proboscis yellow.

Thorax. Yellowish brown; length 1.70 mm with 6 rows of acrostic setulae between the two anterior dorsocentral setae, h index = 0.83. Transverse distance of dorsocentral setae 1.81 of longitudinal distance, dc index= 0.89. Scutellum yellow. Distance between apical scutellar setae 73% of that between apical and basal setae; basal scutellar setae divergent; scut index = 1.62. Sterno index= 0.83. Legs yellow.

Wings beige, length 2.42 mm, length to width ratio= 2.39. Indices: C= 5.0; ac= 1.94; hb= 0.25; 4C= 0.41; 4v= 1.17; 5x= 1.08; M= 0.30; prox. x= 0.33.

Abdomen ( Fig. 7 ). Beige; tergite 1 with less pigmentation; tergite 2 with a middle pigmentation like a triangle, tergites 2 − 4 with dark pigmented hourglass shape.

Length (body + wings) 3.8 mm.

Male terminalia ( Figs. 8 − 9 ). Epandrium microtrichose with 1 upper long seta in the right side and 3 lower long setae in the left side. Cerci not linked to epandrium. Surstylus microtrichose and rectangular with a row of 11 prensisetae in the left and 10 in the right, 11 inner setae in both sites of ventral lobe. Hypandrium sclerotized, shield − shaped. Gonopod oval and microtrichose.

Aedeagus ( Figs. 10 − 12 ). Sclerotized with two crests serrated laterally on the ventral part and two membranous projections with striae on the upper dorsal part. Aedeagal apodeme less sclerotized and strongly bent inventral direction. Ventral rod triangle − shaped. Paraphyses with a small sclerotized microprojections, “C” shaped with a long seta on the upper edge and 2 on the inner edge of middle gonopod.

Etymology. This species is named after the Cuyuja region of

Napo Province, Ecuador.

Relationship to other species. The general shape of the male terminalia does not suggest any relationship to other species of Drosophila tripunctata group.

SUBGROUP III: DROSOPHILA QUIJOS SP. NOV.

Figures

Figures 7 – 12. Drosophila cuyuja sp. nov. (7), abdomen (scale bar = 1mm); (8) epandrium, cerci, surstyli and decasternum; (9) hypandrium and gonopods in ventral view; (10 − 12) aedeagus and paraphyses in dorsal, lateral and ventral view, respectively (scale bar = 100µm).