Subgenus Dudaica Strand, 1943
Katoh, Takehiro K., Zhang, Guang, Toda, Masanori J., Suwito, Awit & Gao, Jian-Jun, 2018, A revision of the subgenus Dudaica Strand of the genus Drosophila Fallen, with descriptions of six new species (Diptera, Drosophilidae), ZooKeys 781, pp. 19-50: 19
treatment provided by
|Subgenus Dudaica Strand, 1943|
Head, scutum, and scutellum mostly milky white, contrasting with mostly dark brown thoracic pleura (Figures 2-4). Scutellum large, more or less rounded apically in dorsal view (Figures 2, 3). Wing fuscous, somewhat wavy (Figures 2, 3).
Head (Figures 2-9): Eye red, with dense interfacetal setulae; longest axis of eye slightly oblique (nearly rectangular in dissimilis sp. n.) against body axis. Ocellar triangle convex; ocellar setae inserted outside triangle made by ocelli. Anterior reclinate orbital seta situated slightly before proclinate orbital seta or just lateral to it (between proclinate and posterior reclinate orbital setae in dissimilis sp. n.) (Figure 4). Pedicel dorsolaterally dark brown (Figure 4); first flagellomere pubescent; arista with 6-8 dorsal and 2-4 ventral branches in addition to terminal bifurcation; terminal bifurcation moderate. Facial carina high, broad. Gena anteriorly dark brown. Occiput ventrally dark brown. Postgena medially dark brown. Postocellar setae present (Figure 5). Supracervical setae tapered, thin, apically curved and slightly blunt (Figure 5). Cibarium not thickened on anterior margin in lateral view (slightly thickened in dissimilis sp. n.); anterior portion slightly dilated; anterolateral corners slightly protruded; dorsal wall pear-shaped, with posterior portion oval; anterior sensilla four, arranged in square; medial sensilla apically sharp, arranged in anteriorly slightly convergent rows; posterior sensilla apically blunt, arranged in anteriorly divergent rows (Figures 6, 7). Clypeus thick at median portion (except for dissimilis sp. n.) (Figures 6, 7). Palpus distinctly large, long and broad (Figures 4, 9) (except for dissimilis sp. n.), pubescent, setigerous, distally flat (except for dissimilis sp. n.) (Figures 9). Prementum dark brown, swollen at the distal end in lateral view (Figure 8). Labellum with five pseudotracheae per side.
Thorax (Figures 2, 3): Postpronotal lobe with 1-3 prominent (lowermost the longest) and 0-4 short setae. Scutum narrowly dark brown along anteromost margin. Thoracic pleura mostly covered with broad, dark brown, more or less blurry, longitudinal stripes (except for dissimilis sp. n.). Basal scutellar setae divergent; apical scutellar setae cruciate. Acrostichal setulae in six, somewhat regular rows. Mid katepisternal seta much shorter than anterior and posterior ones, but distinct from setulae in row below it; caudoventral corner of katepisternum with one long, prominent seta.
Wing (Figures 2, 3) pale grayish yellow to grayish yellow, elliptic, rounded distally (not so elliptic in dissimilis sp. n.), wrinkled especially at basal portion of R4+5; longitudinal veins brown except for R2+3 (pale brown), basal section of M1 (dark brown), and CuA1 (dark brown) (except for dissimilis sp. n.); crossveins shaded at r-m and dm-cu; C1 setae two, subequal; R2+3 distally slightly curved to costa; R4+5 basally diverged from M1, distally nearly parallel with M1; M1 more or less sinuate; A1 well developed, as stout as other veins. Halter entirely grayish yellow to grayish brown.
Legs (Figures 2, 3, 10A, 11A) pale grayish yellow to grayish brown. Preapical dorsal setae present on tibiae of all legs; apical setae present on fore- and mid-leg tibiae. Foreleg first tarsomere with one subproximal and one apical, short, black spines.
Abdomen (Figures 2, 3): Tergite 1 nearly entirely dark brown, 2 to 6 pale yellow, each with anterior and caudal dark brown bands; anterior bands medially sometimes interrupted; caudal bands medially and laterally extended anteriad (except for dissimilis sp. n.). Female tergite 7 nearly entirely pale yellow. Sternites somewhat quadrate, grayish brown to dark brown.
Male terminalia (Figures 10 B–K, 11 B–L, 12 A–K, 13, 14 A–K, 15 A–H, 16): Epandrium pale brown, pubescent except for anterior sub-dorsal to -ventral margin, ventrally narrowed, ventroapically rounded, with setae on caudodorsal and ventral portions; lobe-like apodeme present anterosubdorsally. Cercus dark brown, nearly entirely pubescent, separated from epandrium, caudoventrally with distinct process (except for senilis and dissimilis sp. n.). Surstylus more or less quadrangular; dorsoproximal portion broadly fused to epandrium, with sclerotized ridge connecting epandrium and surstylus (except for dissimilis sp. n.); outer surface not pubescent, anterosubmedially concaved; caudal margin with a slightly sinuate row of peg-like, apically more or less roundish prensisetae decreasing in size ventrally; ventral portion with apically pointed spines on either inner or outer surface: spines on inner, subventral surface longer, somewhat curved upwards. Tenth sternite pale brown, moderately sclerotized, anteromedially wrinkled (flat in dissimilis sp. n.). Hypandrium narrowly triangular (except for orthophallata sp. n. and dissimilis sp. n.), anteriorly with narrow, well developed apodeme, not pubescent (except for malayana , gracilipalpis sp. n., and puberula sp. n.), caudolaterally with a pair of somewhat expanded lobes; a pair of paramedian setae present on the portion fused to paramere. Paramere elongated, apically rounded in ventral view (except for puberula sp. n.), ventrosubapically with 1-2 sensilla (three in dissimilis sp. n.), basally fused to aedeagus, ventrally fused to hypandrium. Aedeagus rod-like, fused to aedeagal apodeme, pale brown to brown, apically darker, slightly curved dorsad (straight in orthophallata sp. n.); aedeagal guide and basal processes absent; apodeme anteriorly expanded in lateral view, shorter than aedeagus.
Female terminalia (Figures 10 L–N, 11 M–O, 12 L–N, 14 L–N, 15I, J): Tergite 8 pale brown, pubescent dorsally to caudolaterally. Epiproct dark brown, entirely pubescent. Hypoproct dark brown, laterally pubescent. Sternite 7 grayish brown, caudally darker, caudomedially deeply notched, nearly entirely pubescent; setae on caudal portion rather long. Oviscapt valve with stout lateral and marginal ovisensilla increasing in size posteriad; apical ovisensillum stout and the largest, bent outwards. Spermathecal capsule pale brown, spherical.
senilis Duda, malayana (Takada), gracilipalpis Katoh & Gao, sp. n., puberula Katoh & Gao, sp. n., albipalpis Katoh, Toda & Gao, sp. n., qiongzhouensis Katoh & Gao, sp. n., orthophallata Katoh, Toda & Gao, sp. n., and dissimilis Katoh & Gao, sp. n.
Key to the species
In this key, not only morphological characters but also the selected “pure” diagnostic nucleotide sites of COI are used to distinguish between albipalpis sp. n. and qiongzhouensis sp. n. (see also Table 2). The numbers of cited figures of Duda (1926) and Gupta and Sundaran (1990) are given as figure D26 and figure G&S90, respectively.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.