Colocasiomyia sabahana, Takano & Gao & Hu & Li & Yafuso & Suwito & Repin & Pungga & Meleng & Kaliang & Chong & Toda, 2021

Takano, Kohei Takenaka, Gao, Jian-Jun, Hu, Yao-Guang, Li, Nan-Nan, Yafuso, Masako, Suwito, Awit, Repin, Rimi, Pungga, Runi Anak Sylvester, Meleng, Paulus Ak, Kaliang, Clement Het, Chong, Lucy & Toda, Masanori J., 2021, Phylogeny, taxonomy and flower-breeding ecology of the Colocasiomyia cristata species group (Diptera: Drosophilidae), with descriptions of ten new species, Zootaxa 5079 (1), pp. 1-70 : 37

2.3 Colocasiomyia sabahana species complex, new

Diagnosis. Cibarial, posterior sensilla absent (ch.6-1; Fig. 4C ). Phallal sheath gently curved dorsad and slightly projected triangularly at dorsobasal corner in lateral view (ch.40-2, 41-1; Figs 11F , 24I ).

Shared characters. Supracervical setae approximately 4 per side, distally more or less curved, longer than inner occipital setae. Anterior reclinate orbital seta small, situated behind proclinate orbital seta; additional, interfrontal setulae on fronto-orbital plate present (ch.2-0). Eye with stout, dense interfacetal setulae (ch.3-1). Distance between antennal sockets wider than half of socket width (ch.4-0). Cibarial, medial sensilla 3–4 per side, in parallel rows narrower than sensilla campaniformia (ch.5-2; Fig. 4C ). Anterior dorsocentral setae behind transverse suture (ch.7- 0). Prescutellar acrostichal setae absent (ch.8-1); acrostichal setulae in 4 rows (ch.9-0). Katepisternal setae small, shorter than postpronotal setae (ch.10-1). Apical scutellar setae nearer to each other than to basal scutellar seta. Costal setae in middle row all weak, trichoid (ch.12-2). Patch covered with only minute pubescence absent on anterodorsal portion of fore tarsomere I (ch.13-1). Male abdominal sternites III–V wider than long (ch.16,17,18-0); V medially concaved on posterior margin. Female abdominal sternite III as long as wide (ch.19-0); V longer than wide (ch.21-1). Male abdominal sternite VI not pubescent at least partly, with a pair of divergent processes longer than 0.1 mm, widely separated from each other, bearing prominent seta on apex and small setae on submedial to distal portion (ch.23,25-0, 24,26,27-1; Fig. 9L,M ). Epandrium pubescent except for anterior to ventral margin and anteroventral elongation; setae on posteroventral portion as thick as cercal setae (ch.32-0); phragma small (narrower than epandrial anteroventral corner) expansion on antero-subapical margin (ch.33-2). Surstylus vestigial, very narrow process, apically with 1 or 2 tiny, trichoid seta(e) (ch.34,35-1). Cercus pubescent only on dorsal half; ventral/apical portion more or less differentiated from upper portion, with many small setae (ch.38-0). Phallal sheath not pubescent, as thick as wide, apically not bilobed (ch.42-0, 43,44-1; Figs 11F,G , 24I,J ); phallapodeme sclerotized plate directed nearly along or slightly oblique to phallal axis (ch.45-1, 46-0; Figs 11F , 24I ). Gonocoxites long, narrow slips ( Figs 11F , 24I ). Epiproct and hypoproct with pubescence (ch.48-0). Oviscapt shorter than phallus (apodeme + sheath), with ovisensilla only on distal portion occupying less than 1/2 of total length (ch.49-0, 51-1). Puparium (3rd instar larva): segments with stout spicules on ventral surface; anterior spiracle with stalk ending in a whorl of 19–25 long branches; stalk as long as posterior spiracle and longer than longest branch; caudal segments not so elongate, with many small spicules, ending in a V-shaped pair of long posterior spiracles ( Fig. 24M,N ). Mouth hook moderately, triangularly expanded medioventrally in lateral view; distal blade as long as basal portion, apically pointed, gently curved downward, with two rows of small, acute teeth on submedial to subapical portion of ventral margin ( Fig. 24O,P ).

Included species. Colocasiomyia sabahana sp. nov. and C. sarawakana sp. nov.

Figures

FIGURE 4. Characters 5 and 6 on the cibarium (dorsal view) of Colocasiomyia xenalocasiae (Okada) (A), C. cristata de Meijere (B) and C. sarawakana sp. nov. (C). Abbreviations: a s, anterior sensilla; m s, medial sensilla; p s, posterior sensillum; s c, sensilla campaniformia. Scale bars: 0.1 mm.

FIGURE 9. Male abdominal sternite VIs of Colocasiomyia colocasiae (Duda) (B in anteroventral view, C in lateral view), C. stamenicola (Carson & Okada) (D in anterior view) and all species of the C. cristata subgroup (A in ventral view, E‒R in anterior view): A, C. ecornuta sp. nov.; E, C. grandis sp. nov.; F, C. vieti sp. nov.; G, C. cristata de Meijere; H, C. matthewsi sp. nov.; I, C. sulawesiana Okada & Yafuso; J, C. kinabaluana sp. nov.; K, C. kotana sp. nov.; L, C. sabahana sp. nov.; M, C. sarawakana sp. nov.; N, C. pistilicola (Carson & Okada); O, C. xenalocasiae (Okada); P, C. diconica (Toda & Okada); Q, C. sumatrana sp. nov.; and R, C. leucocasiae sp. nov. Scale bars: 0.1 mm.

FIGURE 11. Characters 40‒47 on the phallic organs of Colocasiomyia colocasiae (Duda) (A, lateral view; B, ventral view; C, hypandrium and gonocoxites, oblique lateral view), C. xenalocasiae (Okada) (D, lateral view; E, ventral view), C. sabahana sp. nov. (F, lateral view; G, ventral view) and C. cristata de Meijere (H, lateral view; I, ventral view).Abbreviations: aed, aedeagus; goncx, gonocoxite; hypd, hypandrium; phap, phallapodeme; ph sh, phallal sheath. Scale bars: 0.1 mm.

FIGURE 24. Colocasiomyia sabahana Toda, sp. nov. (♂ and ♀ paratypes and puparium from the Park Headquarters area, Mt. Kinabalu, Sabah, Malaysia; C,E,G,K,M,O,Q) and C. sarawakana Toda & Yafuso, sp. nov. (♂ and ♀ paratypes and puparium from Kuching, Sarawak, Malaysia; A,B,D,F,H–J,L,N,P,R). A, Proboscis (caudal view); B, thorax (dorsal view); C, D, male abdominal sternites (ventral view); E, F, female abdominal sternites (ventral view); G, H, periphallic organs (lateral view); I, J, phallic organs (I, lateral view; J, ventral view); K, L, female terminalia (lateral view); M, N, puparium (ventral habitus); O, P, mouth hook; Q, R, cephalopharyngeal skeleton. Arrowheads indicate diagnostic characters. Scale bars: 0.1 mm in A, C–L, Q and R, 0.5 mm in B, 1.0 mm in M and N.