Drosophila (Dudaica) gracilipalpis Katoh & Gao, 2018

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

Drosophila (Dudaica) gracilipalpis Katoh & Gao sp. n.

Figures 2B , 4 , 5 , 6B , 8B , 9B , 11

Type material.

Holotype ♂ (#00484): CHINA: Wangtianshu, Mengla, Yunnan, ca. 670 m a.s.l., 22-25.iv.2007, JJ Gao (KIZ).

Paratypes. INDONESIA: 1♂ (#03902), Bogor, West Java, 14-15.xi.2009, MJ Toda (MZB). CHINA: 1♂ (#00033), Xishuangbanna Tropical Botanical Garden, Mengla, Yunnan, ca. 650 m a.s.l., 19.iii.2006, MJ Toda & KT Takano (KIZ); 1♂ (#03423), same except for 27-28.ix.2011, JJ Gao (KIZ); 1♂ (#06001), same except for 28.ix.2011, JJ Gao (KIZ); 1♀ (#00485), same data as holotype (KIZ); 4♂, 1♀ (#00491, #00492, #03364, #03424, #03425), same except for 30.ix.2011 (KIZ).

Diagnosis.

Palpus long, sinuate, with several stout setae only on basal portion (Figure 9B ). Foreleg tibia with one apical seta (Figure 11A ). Cercus with distinct caudoventral process (Figure 11F ). Hypandrium pubescent, but very indistinctly, on caudolateral lobes (Figure 11J ).

Description

(characters in common with D. malayana not repeated). Adult ♂ and ♀. Head (Figures 2B , 4 - 6B , 8B , 9B ): Arista with 7-8 dorsal and 3-4 ventral branches. Supracervical setae 26-27 per side; postocular setae 12-14 per side. Cibarium with ca. ten medial and ca. nine posterior sensilla per side. Prementum with six (one proximal, three lateral, and two distal) pairs of setae.

Thorax (Figure 2B ): Postpronotal lobe with two prominent and rarely 1-2 short setae. Stripes on thoracic pleura mostly confluent with each other.

Abdomen (Figure 2B ): Anterior bands on tergites 5 and/or 6 (and 7 in female) medially broadly interrupted.

Male terminalia (Figure 11B-L ): Epandrium with ca. two and 10-12 long setae per side on caudodorsal and ventral portions, respectively. Cercus with 22-24 setae. Surstylus with 8-9 prensisetae and ca. seven ventral spines. Paramere ventrosubapically with one sensillum (longer in Indonesian specimen than in Chinese ones). Aedeagal apodeme ca. 1/2 length of aedeagus.

Female terminalia (Figure 11M-O ): Tergite 8 with 4-5 small setae on ventral portion but no on caudodorsal portion. Oviscapt valve with three lateral and 12-13 marginal ovisensilla. Spermathecal capsule apically slightly narrowed, slightly broader than long.

Measurements (in mm): BL = 2.20 in holotype (range in 8♂/2♀ paratypes: 1.63-2.50/2.03-2.63), ThL = 1.00 (0.88-1.06/0.98-1.06), WL = 1.84 (1.60-2.15/2.03-2.10), WW = 0.92 (0.83-1.04/1.02-1.06).

Indices. FW/HW = 0.59 (range in 8♂ and 2♀, or less if noted, paratypes: 0.58-0.63), ch/o = 0.12 (0.07-0.13), prorb = 0.65 (6♂, 2♀: 0.46-0.63), rcorb = 0.30 (7♂, 2♀: 0.20-0.37), vb = 0.45 (7♂, 2♀: 0.22-0.60), orbito = 0.63 (0.50-0.64), dcl = 0.72 (0.63-0.79), sctl = 1.26 (7♂, 1♀: 0.94-1.12), sterno = 0.56 (0.44-0.71), dcp = 0.38 (0.41-0.57), sctlp = 0.95 (0.91-1.00), C = 1.70 (1.56-2.00), 4c = 1.45 (1.32-1.58), 4v = 2.05 (1.83-2.26), 5x = 2.38 (1.80-2.43), ac = 2.90 (2.87-3.29), M = 0.90 (0.75-0.95), C3F = 0.56 (0.52-0.59).

Distribution.

Indonesia (West Java), China (Yunnan).

Etymology.

Referring to the long and thin palpus.

Remarks.

This species closely resembles the foregoing species, D. malayana , in having the long, sinuate palpus and pubescent caudolateral lobe of hypandrium, but can be distinguished from the latter by having only one apical seta on foreleg tibia.

Figures

Figure 2. Left lateral habitus, thorax, wing, and abdomen of Drosophila Dudaica species (part 1). A Dudaica malayana (Takada) (# 03904) B Drosophila gracilipalpis sp. n. (paratype # 03902) C Drosophila puberula sp. n. (holotype # 03365) D Drosophila albipalpis (holotype # 03908). Scale bars: 0.5 mm.

Figure 4. Head (anterior view). A Drosophila malayana (Takada) (# 03903) B Drosophila gracilipalpis sp. n. (paratype # 00492) C Drosophila puberula sp. n. (paratype # 03366) D Drosophila albipalpis sp. n. (holotype # 03908) E Drosophila qiongzhouensis sp. n. (paratype # 03313) F Drosophila orthophallata sp. n. (paratype # 03905) G Drosophila dissimilis sp. n. (holotype # 00430). Abbreviation: plp = palpus. Scale bars: 0.5 mm.

Figure 5. Postocciput (caudal view). A Drosophila malayana (Takada) (# 03903) B Drosophila gracilipalpis sp. n. (paratype # 00492) C Drosophila puberula sp. n. (paratype # 03366) D Drosophila albipalpis sp. n. (holotype # 03908) E Drosophila qiongzhouensis sp. n. (paratype # 03313) F Drosophila orthophallata sp. n. (paratype # 03905) G Drosophila dissimilis sp. n. (holotype # 00430). Abbreviations: poc s = postocellar setae, spc s = supracervical setae. Scale bars: 0.1 mm.

Figure 6. Cibarium of Drosophila Dudaica species (part 1; dorsal and lateral views). A Dudaica malayana (Takada) (# 03903) B Drosophila gracilipalpis sp. n. (paratype # 00492) C Drosophila puberula sp. n. (paratype # 03366) D Drosophila albipalpis sp. n. (holotype # 03908). Abbreviations: cly = clypeus, m s = medial sensilla, p s = posterior sensilla. Scale bars: 0.1 mm.

Figure 8. Prementum (ventral and lateral views). A Drosophila malayana (Takada) (# 03903) B Drosophila gracilipalpis sp. n. (paratype # 00492) C Drosophila puberula sp. n. (paratype # 03366) D Drosophila albipalpis sp. n. (holotype # 03908) E Drosophila qiongzhouensis sp. n. (paratype # 03313) F Drosophila orthophallata sp. n. (paratype # 03905) G Drosophila dissimilis sp. n. (holotype # 00430). Scale bars: 0.1 mm.

Figure 9. Palpus (lateral and dorsal views; only A is photographed at right side and flipped horizontally). A Drosophila malayana (Takada) (# 03903) B Drosophila gracilipalpis sp. n. (paratype # 00492) C Drosophila puberula sp. n. (paratype # 03366) D Drosophila albipalpis sp. n. (holotype # 03908) E Drosophila qiongzhouensis sp. n. (paratype # 03313) F Drosophila orthophallata sp. n. (paratype # 03905) G Drosophila dissimilis sp. n. (holotype # 00430). Scale bars: 0.1 mm.

Figure 11. Drosophila (Dudaica) gracilipalpis sp. n. (A, M-O paratype # 00492 B-K paratype # 03902 L paratype # 00491). A tibia of right foreleg (apical seta indicated with red arrowhead; ventral view) B, C periphallic organs (caudal and caudolateral view, respectively) D surstyli (caudoventral view) E surstylus and epandrial ventral lobe (caudolateral view) F tenth sternite and ventral protrusions of cerci (ventral view) G-I phallic organs (ventral, ventrolateral, and lateral view, respectively) J pubescence on caudolateral lobe of hypandrium (indicated with red arrowhead; caudoventral view) K, L sensilla (indicated with red arrowheads) and apical portion of parameres (ventral view; Indonesian and Chinese specimen, respectively) M, N oviscapt (lateral and ventral view, respectively) O spermatheca. Scale bars: 0.1 mm.