Colocasiomyia xenalocasiae (Okada, 1980)

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 : 39-40

2.4 Colocasiomyia xenalocasiae species complex, new

Diagnosis. A pair of processes on male abdominal sternite VI entirely pubescent (ch.23-1; Fig. 9N–R ). Additional, interfrontal setulae on fronto-orbital plate absent (ch.2-1). Cibarial, medial sensilla in parallel rows as wide as sensilla campaniformia (ch.5-0; Fig. 4A ).

Shared characters. Supracervical setae distally more or less curved, longer than inner occipital setae (ch.1-0). Anterior reclinate orbital seta small, situated just beside or behind proclinate orbital seta. Distance between antennal sockets wider than half of socket width (ch.4-0). Anterior dorsocentral setae behind transverse suture (ch.7-0). Additional dorsocentral setae on presutural area absent. Katepisternal setae large; posterior one longer than longest, postpronotal seta (ch.10-0). Basal scutellar setae short, not reaching to half of apical scutellar setae (ch.11-0; Fig. 5D ). Patch covered with only minute pubescence absent on anterodorsal portion of fore tarsomere I (ch.13-1). Male abdominal sternite V medially concaved on posterior margin. Female abdominal sternites III–V longer than wide (ch.19,20,21-1). Processes on male abdominal sternite VI longer than 0.05 mm, bearing neither prominent seta nor sclerotized claw on apex but small setae on submedial to distal portion (ch.25,26,27,28-0; Fig. 9N–R ). Epandrium more or less triangularly angled at posteroventral corner (ch.30-0; Fig. 10F ); setae on posteroventral portion as thick as cercal setae (ch.32-0; Fig. 10F ); phragma small (narrower than epandrial anteroventral corner) expansion on antero-subapical margin (ch.33-2; Fig. 10F ). Cercus ventro-apically differentiated into small lobe with a number of small setae (ch.38-0; Fig. 10F ). Phallal sheath not pubescent, gently curved ventrad, as thick as wide, apically not bilobed, not projected at dorsobasal corner in lateral view (ch.41,42-0, 40,43,44-1; Fig. 11D,E ); phallapodeme more or less sclerotized plate directed nearly along or slightly oblique to phallal axis (ch.45-1, 46-0; Fig. 11D ). Gonocoxites long, narrow slips ( Fig. 11D ). 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).

Included species. Colocasiomyia pistilicola , C. xenalocasiae , C. diconica , C. sumatrana sp. nov. and C. leucocasiae 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 5. Characters 7‒11 on the thorax (A‒D, dorsal view; E‒G, lateral view) of Colocasiomyia colocasiae (Duda) (A, E), C. grandis sp. nov. (B), C. cristata de Meijere (C, F), C. diconica (Toda & Okada) (D) and C. ecornuta sp. nov. (G). Abbreviations: a dc s, anterior dorsocentral setae; ap sctl s, apical scutellar seta; b sctl s, basal scutellar seta; p kepst s, posterior katepisternal seta; pprn s, postpronotal seta; trn sut, transverse suture. Scale bars: 0.5 mm in A‒D, 0.1 mm in E‒G.

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 10. Characters 30‒39 on the periphallic organs of Colocasiomyia colocasiae (Duda) (A, lateral view; B, anterior view), C. cristata de Meijere (C, lateral view; D, ventral view; E, surstylus) and C. xenalocasiae (Okada) (F, oblique lateral view; G, ventral view; H, surstylus). Abbreviations: cerc, cercus; epand, epandrium; sur, surstylus. 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.