Drosophila (Dudaica) malayana (Takada, 1976)
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
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|Drosophila (Dudaica) malayana (Takada, 1976)|
Drosophila (Dudaica) malayana (Takada, 1976) Figures 2A, 4, 5, 6A, 8A, 9A, 10
Zygothrica malayana Takada, 1976: 68.
Drosophila (Dudaica) malayana : Grimaldi 1990a: 30.
MALAYSIA: 2♂ (holotype and paratype of Zygothrica malayana Takada, 1976), near Kuala Lumpur, Peninsular Malaysia, 3.vii.1972, H Takada ( SEHU); 2♂, Poring, Sabah, 16.iii.1999, MJ Toda ( KPSP, SEHU); 1♂ (#03904), same except for 13.iii.2008 ( KIZ); 1♂ (#03903), same except for 20.iii.2008 ( SEHU). INDONESIA: 1♂, 1♀, Gunung Poteng, West Kalimantan, 4.xii.1996, MJ Toda ( MZB, SEHU).
Palpus long, sinuate, with several stout setae only on basal portion (Figure 9A). Foreleg tibia with two apical setae (Figure 10A). Cercus with distinct caudoventral process (Figure 10F). Hypandrium pubescent on caudolateral lobes (Figure 10J).
Supplementary and revised description.
Adult ♂ and ♀. Head (Figures 2A, 4-6A, 8A, 9A): Arista with 7-8 dorsal and four ventral branches. Supracervical setae 25-30 per side; postocular setae 15-16 per side. Cibarium with ca. eight medial and ca. ten posterior sensilla per side. Prementum with five (one proximal, two lateral, and two distal) pairs of setae.
Thorax (Figure 2A): Postpronotal lobe milky white in upper half, dark brown in lower half, with 2-3 prominent but no short setae. Right and left dorsocentral setae nearly parallel. Notopleuron milky white. Thoracic pleura with three, sometimes rather indistinct stripes.
Legs (Figures 2A, 10A): Foreleg first tarsomere shorter than total length of four succeeding tarsomeres. Mid- and hind-leg first tarsomeres shorter than or as long as total length of four succeeding tarsomeres.
Abdomen (Figure 2A): Anterior bands on tergite 6 medially broadly interrupted.
Male terminalia (Figure 10 B–K): Epandrium with ca. three and ca. 13 long setae per side on caudodorsal and ventral portions, respectively. Cercus with 23-24 setae. Surstylus with ca. nine prensisetae and 7-8 ventral spines. Paramere apically rounded in lateral view, with 1-2 sensilla. Aedeagus dorsoapically with a small, acute claw; apodeme slightly longer than 1/2 length of aedeagus.
Female terminalia (Figure 10 L–N): Tergite 8 with two small setae on ventral portion but no on caudodorsal portion. Oviscapt valve yellowish brown, with three lateral, 13 marginal ovisensilla, and four (three dorsal, one ventral) subterminal, inner, trichoid ovisensilla. Spermathecal capsule slightly longer than broad; introvert ca. 1/5 height of capsule.
Measurements (in mm): BL (straight distance from anterior edge of pedicel to tip of abdomen) = 2.13-2.39/2.27 (range in 2♂/1♀ specimens), ThL (distance from anterior notal margin to apex of scutellum) = 0.98-1.08/1.01, WL (distance from humeral cross vein to wing apex) = 1.78-1.92/1.73, WW (maximum wing width) = 0.89-0.96/0.86.
Indices. FW/HW (frontal width/head width) = 0.56-0.60 (range in 2♂ and 1♀ specimens), ch/o (maximum width of gena/maximum diameter of eye) = 0.08-0.12, prorb (proclinate orbital seta/posterior reclinate orbital seta in length) = 0.61-0.62, rcorb (anterior reclinate orbital seta/posterior reclinate orbital seta in length) = 0.29-0.32, vb (subvibrissa/vibrissa in length) = 0.41-0.59, orbito (distance between proclinate and posterior reclinate orbital setae/distance between inner vertical and posterior reclinate orbital setae) = 0.50-0.67, dcl (anterior dorsocentral seta/posterior dorsocentral seta in length) = 0.64-0.71, sctl (basal scutellar seta/apical scutellar seta in length) = 0.95-0.98, sterno (anterior katepisternal seta/posterior katepisternal seta in length) = 0.59-0.74, dcp (distance between ipsilateral dorsocentral setae/distance between anterior dorsocentral setae) = 0.39-0.44, sctlp (distance between ipsilateral scutellar setae/distance between apical scutellar setae) = 0.94-1.09, C (2nd costal section between subcostal break and R2+3/3rd costal section between R2+3 and R4+5) = 1.75-1.81, 4c (3rd costal section between R2+3 and R4+5/M1 between r-m and dm-cu) = 1.25-1.36, 4v (M1 between dm-cu and wing margin/M1 between r-m and dm-cu) = 1.75-1.95, 5x (CuA1 between dm-cu and wing margin/dm-cu between M1 and CuA1) = 2.12-2.25, ac (3rd costal section between R2+3 and R4+5/distance between distal ends of R4+5 and M1) = 2.56-3.00, M (CuA1 between dm-cu and wing margin/M1 between r-m and dm-cu) = 0.75-0.86, C3F (length of heavy setation in 3rd costal section/length of 3rd costal section) = 0.50-0.62.
Malaysia (Peninsular Malaysia, Sabah*), Indonesia* (West Kalimantan). *New records.
Drosophila malayana was originally described based only on male specimens collected from Peninsular Malaysia, with illustrations but only a very brief description of male terminalia ( Takada 1976). We examined the type specimens of this species, and found that they share the following specific characters with the specimens collected from Borneo (Sabah and West Kalimantan): two strong setae present apically on foreleg tibia and distinctly pubescent caudolateral lobes of hypandrium. Based on these morphological characters, we identified the latter specimens as D. malayana , and described the female terminalia for the first time. However, our identification needs to be confirmed by DNA barcode data of additional specimens from the type locality in the future.
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