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REVISTA ECUATORIANA DE MEDICINA Y CIENCIAS BIOLÓGICAS
Eight new species of Drosophila
Peñafiel and Rafael 2018
Drosophila species. The habitat is a well-
preserved montane forest.
Relationship.- This species belongs to the genus
Drosophila. There is not a species group
appropriate for this species. The most similar
species is Drosophila shunku sp. nov. (Figures
8A-F, 9A-B) described in this paper.
Drosophila taki sp. nov.
Figure 11 A-F
Type material: Holotype male ♂ (dissected,
terminalia in microvial, dry mounted), Ecuador,
Loja, Cajanuma, 2 800 m, 4°6'58.9''S,
79°10'11.9''W, 19 Nov. 2015, A. Peñafiel col., A.
Peñafiel & V. Rafael det. (QCAZ-I 3385).
Paratypes.- 2 ♂♂ (dissected, terminalia in
microvial), Ecuador, Loja, Cajanuma, 2 800 m,
same data as holotype, A. Peñafiel col., A.
Peñafiel & V. Rafael det. (QCAZ-I 3386 – 3387).
1 ♂♂ (dissected, terminalia in microvial),
Ecuador, Loja, Cajanuma, 2 675 m, 4°6'53.7''S,
79°10'54.6''W, 19 Nov. 2015, A. Peñafiel col., A.
Peñafiel & V. Rafael det. (QCAZ-I 3388). 4 ♂♂
(dissected, terminalia in microvial), Ecuador,
Napo, Río Guango, 2548 m, 00°32'14''S,
77°10'13.4''W, 27 Sep. 2016, A.B. Manzano col.,
A. Peñafiel & V. Rafael det. (QCAZ-I 251244 –
251247).
Diagnosis.- Aristae with 4 dorsal and 2 ventral
branches. One prominent oral bristle. Thorax
yellowish brown. Wings yellow. Abdomen
yellow with dorsal midline, 1
st
tergite yellowish
brown, 2
nd
to 4
th
tergites with triangular
pigmentation which reaches the anterior edge of
each tergite, 5
th
and 6
th
tergites slightly
pigmented. Cerci partially fused to epandrium.
Aedeagus slightly sclerotized and elongated,
apex pointed. Paraphyses triangular bearing one
bristle. Hypandrium V-shaped, slightly
sclerotized. Gonopod elongated bearing one
bristle.
Male description.- Holotype external
morphology: total length (body + wings) 5,55
mm, body length 3,70 mm. Body color yellowish
brown.
Head.- Aristae with 4 dorsal and 2 ventral
branches plus terminal fork and small hairs.
Orbital plate yellowish brown, frontal length 0,36
(0,31 – 0,35) mm; frontal index= 0,8 (0,89 –
0,93); top to bottom width ratio = 1,64 (1,56 –
1,72). Medial vertical seta closer to lateral
vertical seta and towards the outer edge of the
orbital plate; distance from or1 to or3 0,11 (0,09
– 0,11) mm, distance from or3 to vtm 0,13 (0,13
– 0,16) mm; or1-or3 ratio = 0,88, or2-or1 ratio =
0,33, distance from ocellar setae 86,1 % of frontal
length, distance from postocellar setae 69,4 (65,7
– 85,2) % of frontal length. Ocellar triangle, 47,2
(42,8 – 45,1) % of frontal length. vt index = 1,02.
Cheek index = 5,90 (7 – 9,4). One prominent oral
bristle, vibrissal index = 0,38 (0,45 – 0,5). Carina
not sulcate and not prominent. Eyes red, eye
index = 1,71 (1,02 – 1,5).
Thorax.- Yellowish brown, thorax length 1,11
(1,06 – 1,28) mm, with acrostichal hairs in 7 rows
between the two anterior dorsocentral setae, h
index = 1,32. Transverse distance of
dorsocentrals 1,82x (1,62x – 1,72x) longitudinal
distance, dc index = 0,61. Distance between
apical scutellar setae 90 (75 – 86,9) % of that
between apical and basal setae. Scut index = 1,05.
Medial katepisternal ¼ of the previous, sterno
index = 4,14.
Legs yellow.
Wings yellow. Alar length 3,73 (3,45 – 3,96) mm,
alar width 1,57 (1,44 – 1,71) mm. Alar indices:
alar = 2,37 (2,19 – 2,44); C = 5,34 (4,32 – 6,2);
ac = 1,51 (1,6 – 2,23); hb = 0,32 (0,24 – 0,33); 4c
= 0,44 (0,42 – 0,53); 4v = 1,35 (1,30 – 1,48); 5x
= 1,17 (1,21 – 1,69); M = 0,35 (0,37 – 0,4) and
prox. x= 0,49 (0,40 – 0,59).
Abdomen.- Yellow with dorsal midline, 1
st
tergite yellowish brown, from 2
nd
to 4
th
tergites
with triangular pigmentation which reaches the
anterior edge of each tergite, 5
th
and 6
th
tergites
slightly pigmented (Figure 11A).
Male terminalia.- Cerci partially fused to
epandrium. Surstylus rectangular and
microtrichose, with 12 primary teeth on the right
and 11 on the left side and 15 marginal bristles
(Figure 11B). Hypandrium V-shaped slightly
sclerotized, with anterior stretch-marks.
Gonopod elongated bearing one bristle (Figure
11C).
Aedeagus.- Slightly sclerotized and elongated,
apex pointed. Paraphyses triangular bearing one
bristle. Ventral rod undeveloped. Aedeagal
apodeme sclerotized and straight (Figure 11D-F).