Colocasiomyia cristata, de Meijere, 1914

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 : 20

Colocasiomyia cristata species group

Colocasiomyia cristata species group: Okada, 1990: 69; Sultana et al., 2006: 694; Fartyal et al., 2013: 768.

Diagnosis (modified from Fartyal et al. 2013). Fore tarsomere II with 4 or 5 equal-sized pegs on lower elongation (ch.14-1,2; Fig. 7A,B ). Hypandrium posterolaterally connected to basal portion of phallal sheath through a pair of gonocoxites ( Fig. 11 ).

Shared characters. Arista entirely densely pubescent, without branches ( Figs 3C,G , 19A ). Anterior reclinate orbital seta situated outside proclinate orbital seta ( Fig. 3B,F ). Palpus more or less convex in ventrodistal portion, with prominent seta apically and several shorter ones medially to distally. All cibarial sensilla tiny; anterior sensilla irregularly arranged in square or triangle ( Fig. 4 ). Proboscis without a pair of lateral spherical bumps covered with numerous, short, stout setae. Spiracles small. Abdominal sternite II wider than long, somewhat trapezoid or triangular, posteriorly narrowing. Epandrium anteroventrally much elongated, not fused to cercus, without peg-like, stout seta at posteroventral apex ( Fig. 10A,C,F ). Pregonites absent ( Fig. 11 ). Hypandrium more or less quadrate plate-like, as wide as or slightly wider than phallapodeme, lacking setae, posteriorly articulated to tips of epandrial ventral elongations ( Fig. 11 ). Phallapodeme horizontally flat, fused to phallal sheath ( Fig. 11 ). Oviscapt lateral lobes not fused to each other ( Fig. 16J ); ovisensilla all trichoid ( Fig. 12A,C ).

Included taxa. Colocasiomyia colocasiae species subgroup; C. cristata subgroup; and C. seminigra (Duda) *. Geographical distributions of all the component species are shown in Fig. 14 . * Due to the insufficient information in the original description by Duda (1923), it cannot be determined to which subgroup this species from Papua New Guinea is to be assigned.

Figures

FIGURE 3. Characters 1‒4 on the head of Colocasiomyia colocasiae (Duda) (A‒D) and C. cristata de Meijere (E‒H). A, E, Caudal view; B, F, dorsal view; C, G, frontal view; D, H, right eye (frontal view). Abbreviations: ar, arista; a rc orb s, anterior reclinate orbital seta; i ocp s, inner occipital setae; pc orb s, proclinate orbital seta; spc s, supracervical setae. Character states are indicated in the form of ‘character No.-state code’. Scale bars: 0.1 mm.

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 7. Characters 13‒15 on the fore (A, B, distal portion of tibia and tarsus) and mid (C, D, ditto) legs of Colocasiomyia colocasiae (Duda) (A, C) and C. cristata de Meijere (B, D). 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.

FIGURE 12. Characters 48‒51 on the female terminalia of Colocasiomyia colocasiae (Duda) (A, lateral view; B, hypoproct in ventral view) and C. cristata de Meijere (C, lateral view; D, hypoproct in ventral view). Abbreviations: epiprct, epiproct; hyprct, hypoproct; ov, oviscapt; t-VIII, tergite VIII. Scale bars: 0.1 mm.

FIGURE 14. Geographical distributions of all species of the Colocasiomyia cristata group.

FIGURE 16. Colocasiomyia ecornuta Toda & Takano, sp. nov. (♂ and ♀ paratypes and puparium from Soppeng, South Sulawesi, Indonesia). A, Head (frontal view); B, scutum and scutellum (dorsal view); C, D, abdominal sternites in ventral view (C, male; D, female); E, periphallic organs (caudolateral view; inset: cercal ventral lobe); F, phallal sheath (dorsal view); G, H, phallic organs (G, lateral view; H, ventral view); I peri-oviscapt (caudal view); J, oviscapt (ventral view); K, puparium (ventral habitus; inset: caudal-most portion at lower right and ventrolateral portion of segments at the upper right); L, mouth hook; M, cephalopharyngeal skeleton. Abbreviations: i vt s, inner vertical setae; sctl, scutellum. Scale bars: 0.1 mm in A–J and M, 1.0 mm in K.

FIGURE 19. Colocasiomyia cristata de Meijere (♂ and ♀ from Bogor, West Java, Indonesia). A, Antenna; B, dorsal portion of proboscis (caudal view; yellow arrowheads indicating supralateral setae outside prementum); C, male abdominal sternites (ventral view); D, female abdominal sternites (ventral view). Scale bars: 0.1 mm.