Colocasiomyia ecornuta Toda & Takano, 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 : 22-24

publication ID	https://doi.org/ 10.11646/zootaxa.5079.1.1
publication LSID	lsid:zoobank.org:pub:2B118B81-7353-4A2C-A892-5466DFC83230
DOI	https://doi.org/10.5281/zenodo.5786114
persistent identifier	https://treatment.plazi.org/id/03D75C2D-457F-2E28-FF52-60DDB70DB79D
treatment provided by	Plazi
scientific name	Colocasiomyia ecornuta Toda & Takano
status	sp. nov.

Treatment

1) Colocasiomyia ecornuta Toda & Takano View in CoL , sp. nov.

( Figs 5G View FIGURE 5 , 9A View FIGURE 9 , 15A View FIGURE 15 , 16 View FIGURE 16 )

Colocasiomyia sp.3 aff. sulawesiana: Sultana et al., 2006: 694 .

Diagnosis. Outer vertical seta absent ( Fig. 16A View FIGURE 16 ). Katepisternal setae minute ( Fig. 5G View FIGURE 5 ). Scutellum with several setulae scattered on dorsal surface ( Fig. 16B View FIGURE 16 ). Male abdominal sternite VI without any process ( Figs 9A View FIGURE 9 , 16C View FIGURE 16 ). Cercus ventrally narrowed, strongly curved posteriad, apically forming somewhat triangular lobe bearing 1 long and many short setae ( Fig. 16E View FIGURE 16 ). Phallal sheath pubescent on dorsal surface, gently curved ventrad, wider than thick, distally narrowing, basally roundly dilated, apically knobbed, subapically with small, acute projection on right margin ( Fig. 16F–H View FIGURE 16 ). Gonocoxites broad, somewhat triangular plates ( Fig. 16G View FIGURE 16 ). Neither epiproct nor hypoproct pubescent ( Fig. 16I View FIGURE 16 ). Oviscapt distally narrowing, apically obliquely truncated and with 6–7 trichoid ovisensilla ( Fig. 16J View FIGURE 16 ).

Description (♂ and ♀). Head. Supracervical setae 7–11 per side, nearly straight, as long as inner occipital setae. Anterior reclinate orbital seta long, situated slightly anteriorly to proclinate orbital seta; additional, interfrontal setulae on fronto-orbital plate present ( Fig. 16A View FIGURE 16 ). Eye with fine, sparse interfacetal setulae ( Fig. 16A View FIGURE 16 ). Distance between antennal sockets narrower than half of socket width ( Fig. 16A View FIGURE 16 ). Cibarial, medial sensilla (1–3 per side) in parallel rows narrower than sensilla campaniformia; posterior sensillum 1 per side. Supralateral setae outside prementum 3–4 per side.

Thorax.Anterior dorsocentral setae just beside or slightly behind transverse suture ( Fig. 16B View FIGURE 16 ). Neither additional dorsocentral setae on presutural area nor prescutellar acrostichal setae present; acrostichal setulae in 4 rows ( Fig. 16B View FIGURE 16 ). Basal scutellar setae short, not reaching to half of apical scutellar setae; apical scutellar setae much nearer to each other than to basal scutellar seta ( Fig. 16B View FIGURE 16 ).

Wing. Costal setae in middle row all weak, trichoid.

Legs. Patch covered with only minute pubescence absent on anterodorsal portion of fore tarsomere I. Mid tibia with 2 apical, stout setae.

Abdomen. Male: sternite III longer than wide; IV as wide as long ( Fig. 16C View FIGURE 16 ). Female: sternites III–V longer than wide; VI wider than long ( Fig. 16D View FIGURE 16 ). Male sternite VI not pubescent at least partly ( Fig. 9A View FIGURE 9 ).

Male terminalia. Epandrium pubescent on dorsal and posterolateral portions, roundish on posteroventral margin, with 2–3 setae near posterodorsal margin and 11–12 setae thicker than cercal setae on posteroventral portion of each side, but lacking phragma ( Fig. 16E View FIGURE 16 ). Surstylus long, somewhat triangular plate with 2 stout teeth dorsally and 3 long, recurved, trichoid setae ventrally on distal margin ( Fig. 16E View FIGURE 16 ). Median piece of subepandrial sclerite mostly bilobed into long, highly wrinkled lobes connected only at posterior end; lateral pieces less sclerotized broad plates. Cercus nearly entirely pubescent, with approximately 22 setae, including especially long, most ventral one, on dorsal, oval portion ( Fig. 16E View FIGURE 16 ). Phallapodeme less sclerotized thin plate, nearly perpendicular to phallal axis ( Fig. 16G View FIGURE 16 ).

Female terminalia. Oviscapt shorter than phallus (apodeme + sheath) ( Fig. 16G,H,J View FIGURE 16 ).

Indices (range of 4♂ and 4♀): FW/HW (frontal width / head width) = 0.59–0.66, ch/o (maximum width of gena / maximum diameter of eye) = 0.49–0.57, prorb (proclinate orbital seta length / posterior reclinate orbital seta length) = 0.86–0.95, rcorb (anterior reclinate orbital seta length / posterior reclinate orbital seta length) = 0.54–0.70, vb (subvibrissal seta length / vibrissa length) = 0.30–0.51, dcl (anterior dorsocentral seta length / posterior dorsocentral seta length) = 0.69–1.00, sctl (basal scutellar seta length / apical scutellar seta length) = 0.69–0.78, sterno (anterior katepisternal seta length / posterior katepisternal seta length) = 0.60–0.79, orbito (distance between proclinate and posterior reclinate orbital setae / distance between inner vertical and posterior reclinate orbital setae) = 0.42–0.58, dcp (distance between ipsilateral dorsocentral setae / distance between anterior dorsocentral setae) = 0.98–1.19, sctlp (distance between ipsilateral scutellar setae / distance between apical scutellar setae) = 2.00, C (2nd costal section between subcostal break and R 2+3 / 3rd costal section between R 2+3 and R 4+5) = 1.08–1.56, 4c (3rd costal section between R 2+3 and R 4+5 / M 1 between r-m and dm-m) = 1.16–1.51, 4v (M 1 between dm-m and wing margin / M 1 between r-m and dm-m) = 1.70–1.97, 5x (M 4 between dm-m and wing margin / dm-m between M 1 and M 4) = 1.76–2.00, ac (3rd costal section between R 2+3 and R 4+5 / distance between distal ends of R 4+5 and M 1) = 2.67–3.38, M (M 4 between dm-m and wing margin / M 1 between r-m and dm-m) = 0.49–0.59.

Puparium (3rd instar larva). Segments with stout spicules on ventral surface; some lateral ones large, clawlike; anterior spiracle absent; caudal segments elongate, very narrow, without spicules, ending in a pair of minute posterior spiracles ( Fig. 16K View FIGURE 16 ). Mouth hook: distal blade shorter than basal portion, apically more or less roundish, gently curved downward, with two lines of blunt teeth on submedial portion of ventral margin ( Fig. 16L View FIGURE 16 ).

Holotype. ♂ ( MZB), “ Soppeng , South Sulawesi, Indonesia, 9.i.2005, K. T. Takano / Emerged from puparium collected from an inflorescence of Alocasia balgooyi ”.

Paratypes. Indonesia: 3♂, 4♀, same data as the holotype ( MZB, SEHU) .

Distribution. Sulawesi (South Sulawesi).

Remarks. This species is peculiar in having many unusual characters as described in the diagnosis. Especially, the absence of any process on the male abdominal sternite VI is exceptional in the C. cristata species group.

Etymology. Referring to the lack of process on the male abdominal sternite VI.