Colocasiomyia todai
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Ordo: Diptera
Familia: Drosophilidae
Genus: Colocasiomyia
Name
Colocasiomyia todai Jiao & Gao sp. nov. – Wikispecies link – ZooBank link – Pensoft Profile
Diagnosis
This species closely resembles C. longivalva in external morphology and structure of male genitalia, but can be distinguished from the latter by epandrium with short ventral lobe apically inlaid with a thick, long, inward-curved, spine-like seta (Fig. 4A, B); surstylus with 2 small, peg-like sensilla on inner, apical surface, 2 tiny, tooth-like setae on inner, ventrosubapical surface, and 1 tiny, trichoid seta on inner, dorsosubapical surface (Fig. 4C); and distal, narrow portion of oviscapt shorter than proximal, broad portion (Fig. 4F).
Description
(♂, ♀). Head: Supracervical setae about 17 per side. Dorsomedial arm of tentorial apodeme about 2/3 as long as dorsolateral arm. Eye red, somewhat roundish, lacking interfacetal setulae. Frontal vitta mat, black. First flagellomere not concave on inner margin. Facial carina trapeziform, medially twice as wide as first flagellomere, as long as pedicel and first flagellomere combined. Palpus convex on ventrodistal portion. Cibarium posterior sensilla minute, 1 or 2 per side. Labellum with 19 pseudotracheae per side.
Thorax (Fig. 3A, C): Scutum, scutellum and thoracic pleura glossy, blackish brown to black. Acrostichal setulae in 6 rows. Wing (Fig. 3D) hyaline, veins yellow. Halter grayish brown except for grayish yellow stalk.
Legs (Fig. 3A, E) blackish brown to black except for grayish yellow tarsi. Foreleg second tarsomere with 10−12 pegs. Foreleg coxa large, with 1−2 long setae on underside near attachment to trochanter. Small preapical dorsal seta present only on hindleg tibia.
Abdomen (Fig. 3A): Tergites glossy, entirely black; II to VI+VII each bearing setulae and setae in approximately 3−4 transverse rows; setae of posteriomost row largest. Sternites yellowish brown to blackish brown; VI somewhat triangular, posteriorly not bilobed.
Male terminalia (Fig. 4A−E): Epandrium broad, with large, prominent apodeme lobe on anteromedial to subventral margin, pubescent except for anterior and ventral margins; anteroventral portion curved inward, apically articulated to lateral arm of hypandrium (Fig. 4A, B). Cercus semilunar, narrowly projected at ventral apex, pubescent except for anterior margin and ventral 1/3, with ca 52 setae (Fig. 4A). Surstylus entirely narrow sclerite, elongated downward, basally articulated with epandrial ventral lobe (Fig. 4A−C). Tenth sternite less sclerotized, folded into two lateral lobes caudodorsally connected with each other (Fig. 4B). Hypandrium long, thin plate, distal 1/3 constricted, posteriorly T-shaped, with lateral arms fused to aedeagal basal processes (Fig. 4D, E). Paramere broad sword-shaped in lateral view, coalescent to hypandrium, triangular in ventral view, distally curved ventrad, with ca 4 sensilla arranged in a row (Fig. 4D, E). Aedeagus separated into a pair of lobes ventrally connected with each other, pubescent basally, subapically bent ventrad, pointed at apex; aedeagal basal processes somewhat membranous, connecting dorsobasal corners of aedeagus and lateral arms of hypandrium (Fig. 4D, E). Female terminalia (Fig. 4F): Tergite VII mid-dorsally not constricted; VIII pubescent nearly entirely, with 3 setae in a vertical row on discolored, posteroventral portion. Oviscapt with distal, narrow elongation in addition to proximal, broad portion; proximal portion with large patch of dense, distinct warts; distal portion apically more or less truncated, with ca 3−4, 7−8 and 6 trichoid ovisensilla per side on basal 2/5 of dorsal margin, entire ventral margin, and at apex, respectively, but lacking any peg-like ovisensillum.
Measurements: BL = 3.53 (range in 5♂ paratypes: 3.27−3.38; range in 5♀ paratypes: 3.25−3.70) mm, ThL = 1.67 (1.56−1.72; 1.49−1.73) mm, WL = 3.38 (3.09−3.45; 3.15−3.45) mm, WW = 1.50 (1.25−1.48; 1.30−1.50) mm.
Indices: arb = 0/0 (5♂, 5♀, or less if noted, paratypes: 0/0), FW/HW = 0.56 (0.56−0.59), ch/o = 0.59 (0.45−0.57), prorb = 0.87 (0.75−0.99), rcorb = 0.38 (0.35−0.49), orbito = 0.68 (0.64−0.95), vb = 0.46 (0.34−0.49), dcl = 0.51 (4♂, 5♀: 0.49−0.56), dcp = 1.09 (4♂, 5♀: 1.02−1.19), sterno = 0.97 (0.75−0.98), sctl = 0.75 (4♂, 5♀: 0.73−0.84), sctlp = 1.47 (1.28−1.47), C = 1.82 (1.82−2.11), 4c = 1.26 (1.05−1.25), 4v = 2.02 (1.76−2.04), 5x = 0.91 (0.89−1.06), ac = 3.45 (3.09−3.82), M = 0.46 (0.38−0.48), C3F = 0.80 (0.73−0.85).
Material examined
Holotype ♂ (#10122): China: ex inflorescence of Rhaphidophora peepla (Roxb.) Schott, Ertaipo, Gaoligong Moutains, Baoshan, Yunnan, China, 25°18.0'N, 98°47.0'E, ca 2200 m, 31.vii.2019, Jian-Jun Gao and Xue-Lin Ye (KIZ). Paratypes: same data as holotype except for ca 2000–2250 m (5♂: #10115–18, #10131; 13♀: #10100, #10102, #101004, #10106–08, #10110, #10112, #10113, #10125, #10126, #10128, #10130) (KIZ).
Distribution
China (Yunnan).
Host plant
Rhaphidophora peepla (Roxb.) Schott (Fig. 1A–D).
Etymology
Patronym, in honor of Professor Masanori J. Toda (Hokkaido University), who dedicated himself to the studies of taxonomy and flower-visiting/breeding behaviors of Colocasiomyia flies.
Remarks
Li et al. (2014)[1] described C. longifilamentata, C. hailini, C. yini and C. longivalva with specimens collected exclusively from inflorescences of R. decursiva at Baihualing, Baoshan, Western Yunnan, but mentioned that very few adults of the last two species, especially C. longivalva, were collected from inflorescences of R. decursiva. Our subsequent field work there has revealed that C. longifilamentata and C. hailini, rarely together with C. yini, share inflorescences/infructescences of R. decursiva as their breeding resources but that C. longivalva does not breed on this plant at all (data not shown). Recently, we have found that C. longivalva, together with C. todai sp. nov., use R. peepla as a host plant: adults of both species were abundantly collected from inflorescences of this plant (Table 1); and a large number of Colocasiomyia 1st-instar larvae were found overwintering within egg capsules between growing pistils of infructescences, and they were later identified as C. longivalva or C. todai sp. nov. by DNA barcoding or by examining the morphology of adults obtained from rearing the 1st-instars (data not shown).
Original Description
- Jiao, R; Bai, L; Gao, J; 2020: Descriptions of two new species of the genus Colocasiomyia (Diptera, Drosophilidae) breeding on Rhaphidophora host plants in Yunnan, China ZooKeys, 968: 127-141. doi
Images
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Other References
- ↑ Li N, Toda M, Fu Z, Li S, Gao J (2014) Taxonomy of the Colocasiomyia gigantea species group (Diptera, Drosophilidae), with descriptions of four new species from Yunnan, China.ZooKeys406: 41–64. https://doi.org/10.3897/zookeys.406.7176
