Drosophila napoensis, 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 : 290-292

Drosophila napoensis sp. nov.

( Figs. 1 − 6 )

Type material. Male holotype (dissected, terminalia in microvial), labelled “ D. napoensis Holotype ♂, E. L. Ramos & V. Rafael det. 2014 Ecuador, Napo, Papallacta (opposite the west side of Papallacta Lake, across the road) , 00°22’52.6”S, 78°09’44.4”W, 3362 m). II. 08/09 /2012, E.L. Ramos col., ( QCAZI 3004 ). Paratype: 1♂ (dissected, terminalia in microvial), same data as holotype (QCAZI 3005).

Diagnosis. Aristae generally with 5 dorsal and 2 ventral branches on the right antenna and 4 dorsal and 3 ventral branches on the left, plus terminal fork. Basal scutellar setae divergent. Surstylus with a row of 10 prensisetae in the left and 8 (9) on the right, 14 inner setae on the right and 18 on the left. Aedeagus with two lateral serrate projections (ear shaped) whose distal edge almost reaches the apex, apex invaginated with membranous center and with striae. Hypandrium shield-shaped.

Description. Head. Frons yellowish brown, frontal length 0.40 mm; frontal index = 0.78 (0.83), top to bottom width ratio = 1.31 (1.31). Frontal triangle yellowish brown. Ocellar triangle brown, ocellus yellow. Orbital plate brown, the medial vertical setae was closer to lateral vertical setae and slightly toward the outer edge of the orbital plate, distance of or3 to or1, 12% (10%) of or3 to vtm, 0.15 (0.13), or1/or3 ratio 0.69 (0.70) or2/or1 ratio 0.60 (0.48) postocellar setae 65% (62.50%) and ocellar setae 90% (87.50%) of frontal length; vt index = 0.79 (0.67), vibrissal index = 0.65 (0.68). Frontal vitta brown. Gena and postgena yellow. Face yellowish brown. Carina yellowish brown, prominent, not sulcate. Cheek index = 11 (9.14). Eyes red; eye index = 1.27 (1.33). First flagellomere brown. Aristae plumose, right aristae with 5 dorsal and 2 ventral branches and 4 dorsal and 3 ventral branches in the left, plus terminal fork. Proboscis beige.

Thorax. Brown; length 1.45 (1.05) mm with 6 rows of acrostical setulae between the two anterior dorsocentral setae, h index = 0.94 (1.01). Tranverse distance of dorsocentral setae 1.73 (1.62) of longitudinal distance, dc index = 0.56 (0.57). Scutellum brown. Distance between apical scutellar setae 62% (78%) of that between apical and basal setae; basal scutellar setae divergent; scut index = 1.11 (1.80, apical scutellar setae broken). Pleura yellow, sterno index = 0.92 (0.88), median katepisternal setae slightly smaller than the anterior. Legs yellow.

Wings beige, length 3.81 mm (3.83), length to width ratio = 2.11 (2.29). Indices: C= 3.42 (3.92); ac= 2.45 (2.22); hb= 0.30 (0.33); 4c= 0.58 (0.53); 4v= 1.25 (1.35); 5x= 1.12 (1.47); M= 0.34 (0.38); prox.x= 0.30 (0.31).

Abdomen ( Fig. 1 ). Yellow; tergite 1 without pigmentation;

2 − 6 with an apical band uninterrupted in the midline.

Length (Body + wings) 4.79 (4.90) mm

Male terminalia ( Figs. 2 − 3 ). Epandrium microtrichose without setae above, with 2 lower short setae weakly sclerotized. Cerci not linked to epandrium. Surstylus almost elliptic and microtrichose; with a row of 10 prensisetae on the left and 8 (9) on the right, 14 inner setae in the right and 18 in the left. Hypandrium shield-shaped. Gonopod microtrichose with one seta in the middle.

Aedeagus ( Figs. 4 − 6 ). Weakly sclerotized with two lateral serrate projections (ear shaped) whose distal edges almost reach at apex. Apex invaginated with a membranous center and with striae. Aedeagal apodeme less sclerotized. Paraphyses broken with fine hairs.

Etymology. Name refers to the Ecuadorian province, Napo, 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. loewi Vilela & Bächli, 2000

Figures

Figures 1 – 6. Drosophila napoensis sp. nov.(1) abdomen (scale bar = 1mm); (2) epandrium, cerci, surstyli and decasternum; (3) hypandrium and gonopods in ventral view; (4 − 6) aedeagus in dorsal, lateral and ventral view, respectively (scale bar = 100µm).