Dichaetophora borneoensis Yang & Gao, 2017

Yang, Jin-Hua, Toda, Masanori J., Suwito, Awit, Hashim, Rosli & Gao, Jian-Jun, 2017, A new species group in the genus Dichaetophora, with descriptions of six new species from the Oriental region (Diptera, Drosophilidae), ZooKeys 665, pp. 121-146 : 127-129

Dichaetophora borneoensis Yang & Gao sp. n.

Figs 3K-M , 4P-T , 8

Type material.

Holotype ♂ (#03895), MALAYSIA: Park Headquarters, Mt. Kinabalu, Sabah, 16.viii.2011, K Akutsu (KPSP).

Paratypes: same data as holotype except for 17.viii.2011 (1♂: #03896, KIZ); same data as holotype except for 11.iii.2008 (2♀: #03893, #03894, KIZ); same data as holotype except for 2.i.1999, MJ Toda (8♂, 2♀, SEHU; 1♀, KPSP; 1♀, ZSM); Poring, Mt. Kinabalu, Sabah, Malaysia, 28.xii.1998 (1♂); Mahua, Crocker Range, Sabah, Malaysia, 14.x.1999, MJ Toda (1♂, ZSM).

Diagnosis.

Postocellar setae present; spermathecal capsule somewhat cylindrical, apically flat; introvert 7/10 as deep as capsule height (Fig. 8J ); COI = C, C, T, T, C and C at sites 235, 499, 519, 532, 541 and 544, respectively; COII = G, T, C, A and G at sites 309, 389, 441, 513 and 636, respectively (Table 5 ).

Description.

Head (Figs 3K, L , 4P-T ): First flagellomere grayish brown. Dorsolateral tentorial apodemes slightly divergent in basal 2/5 but strongly divergent in distal 3/5; supracervical setae 21-25 per side; postocular setae 23-24 per side. Palpus with one subprominent, lateromedial seta. Cibarium with ca. 80 medial and 9-12 posterior sensilla per side.

Wings (Fig. 3M ) slightly fuscous; veins yellowish brown to brown. Halter and stem gray.

Legs (Fig. 3K ): All femora blackish brown; foreleg coxa, tibia and tarsus (except 5th tarsomere) grayish brown; rest grayish yellow. Apical setae present on foreleg and mid-leg tibiae. Mid-leg first tarsomere as long as total length of four succeeding tarsomeres; hindleg first tarsomere longer than total length of four succeeding tarsomeres.

Male terminalia (Fig. 8A-G ): Epandrium pubescent except for anterior margin, with 1-2 dorsal and 7-11 ventral, long setae per side. Surstylus with 1-3 short spines and medial patch of pubescence on outer surface and 7-10 recurved spines on inner, caudal portion. Tenth sternite lingulate, slightly curved. Cercus pubescent except for dorsal to caudal margin, with 15-17 long setae distributed nearly all over; sclerotized, caudoventral bridge of cerci medially with narrowly elongated process. Paramere some what triangular in lateral view, apically round, with sensilla on inner surface. Aedeagus apically trilobed, densely hirsute on outer lobes, dorsosubapically with a pair of small, marginally serrated flaps.

Female terminalia (Fig. 8H-J ): Oviscapt valve dorsomedially narrowly extended, with 4-5 lateral and 12-15 marginal, peg-like ovisensilla. Spermathecal capsule with fine spinules on distal half of outer surface.

Measurements (in mm): BL = 2.42 in holotype (1♂ paratype: 2.10; range in 2♀ paratypes: 2.34-2.57), ThL = 1.01 (0.87; 0.93-0.96), WL = 2.19 (1.84; 1.82-2.14), WW = 0.97 (0.85; 0.92-0.94).

Indices: FW/HW = 0.50 (1♂, 2♀, or less if noted, paratypes: 0.48-0.51), ch/o = 0.19 (0.25-0.29), prorb = 0.66 (1♂, 1♀: 0.63-0.73), rcorb = 0.23 (1♂, 1♀: 0.24-0.30), orbito = 0.62 (0.53-0.60), dcl = 0.76 (1♀: 0.77), sctl = 0.86 (0.84-0.87), sterno = 0.59 (1♂, 1♀: 0.58-0.62), dcp = 0.49 (0.49-0.52), sctlp = 0.90 (0.84-0.89), C = 1.82 (1.82-2.01), 4c = 1.47 (1.31-1.51), 4v = 2.51 (2.22-2.70), 5x = 2.16 (2.11-2.32), ac = 2.81 (2.88-3.15), M = 0.79 (0.71-0.87), C3F = 0.59 (0.57-0.63).

Etymology.

Pertaining to the type locality.

Distribution.

Malaysia (Sabah).

Figures

Figure 3. Left lateral habitus, head and thorax (dorsal view), wing (left, ventral view), and abdomen (dorsal view). A-D Dichaetophora tirlobita sp. n. (# 03877) E-G D. heterochroma sp. n. (# 03879) H-J D. flatosternata sp. n. (# 04172) K-M D. borneoensis sp. n. (# 03895) N-P D. javaensis sp. n. (# 03892) Q-S D. sumatraensis sp. n. (# 03890). Scale bars: 1.0 mm.

Figure 4. Head (anterior view), postocciput, palpus, and prementum (ventral and lateral view, respectively). A-E Dichaetophora tirlobita sp. n. (# 03877) F-J D. heterochroma sp. n. (# 03879) K-O D. flatosternata sp. n. (# 04172) P-T D. borneoensis sp. n. (# 03895) U-Y D. javaensis sp. n. (# 03892) Z-D D. sumatraensis sp. n. (# 03890). Scale bars: 0.1 mm except for A, F, K, P, U, Z (0.5 mm).

Figure 8. Dichaetophora borneoensis sp. n. (A-G # 03895 H-J paratype # 03894). A, B Periphallic organs (posterior and posterolateral view, respectively) C surstyli and cerci, with red arrow indicating the median, elongated process on the caudoventral bridge of cerci D-F phallic organs (ventral, ventrolateral and lateral view, respectively) G distal portion of hypandrium (posteroventral view), showing the caudolateral plates not pubescent (red arrows) and the paramedian setae H, I oviscapt (lateral and ventral view, respectively) J spermatheca (lateral view). Scale bars: 0.1 mm.