Colocasiomyia matthewsi 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 : 34-37

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.5786177
persistent identifier	https://treatment.plazi.org/id/03D75C2D-454B-2E1B-FF52-6683B62CB1F1
treatment provided by	Plazi
scientific name	Colocasiomyia matthewsi Toda
status	sp. nov.

Treatment

8) Colocasiomyia matthewsi Toda View in CoL , sp. nov.

( Figs 9H View FIGURE 9 , 15H View FIGURE 15 , 23 View FIGURE 23 )

Colocasiomyia sp. aff. cristata: Fartyal et al., 2013: 768 .

Diagnosis. A pair of processes on male abdominal sternite VI long (> 0.05 mm), widely separated, strongly divergent, slightly curved inward ( Fig. 9H View FIGURE 9 ). Epandrium pubescent except for anteroventral elongation and anterior, ventral and posteroventral margins, posteroventrally extended as ventral lobe somewhat pointed and bearing many small setae on apex, with 7–8 setae on lateral portion and 30–31 setae as thick as cercal setae on ventral lobe of each side ( Fig. 23C View FIGURE 23 ). Phallal sheath apicoventrally narrowed and apically round in lateral view ( Fig. 23D View FIGURE 23 ). Oviscapt very short, only twice as long as wide, somewhat oval, with 23–24 ovisensilla on nearly entire surface ( Fig. 23F View FIGURE 23 ).

Description (♂ and ♀; not repeating characters common to C. kinabaluana sp. nov.). Head. Supracervical setae 5–8 per side, distally more or less curved, longer than inner occipital setae. Cibarial, medial sensilla 3–4 per side. Supralateral setae outside prementum 3–5 per side.

Thorax. Anterior dorsocentral setae behind transverse suture.

Abdomen. Male sternite III longer than wide, posteriorly slightly narrowing; IV wider than long ( Fig. 23A View FIGURE 23 ). Female sternite V wider than long; VI wider than long, medially concaved on posterior margin ( Fig. 23B View FIGURE 23 ).

Male terminalia. Cercus pubescent only on dorsal 2/5, with 56–57 setae, extended below, apically forming broad lobe marginally roundish and fringed with small setae ( Fig. 23C View FIGURE 23 ). Phallapodeme sclerotized plate slightly oblique to phallal axis ( Fig. 23D View FIGURE 23 ).

Female terminalia. Hypoproct medially with a small patch of pubescence ( Fig. 23F View FIGURE 23 ).

Indices (range of 10♂ and 10♀ paratypes): FW/HW = 0.53–0.58, ch/o = 0.28–0.36, prorb = 0.86–1.14, rcorb = 0.33–0.56, vb = 0.26–0.47, dcl = 0.57–0.74, sctl = 0.74–0.98, sterno = 0.65–1.10, orbito = 0.45–0.82, dcp = 0.97–1.30, sctlp = 1.27–1.82, C = 1.74–2.12, 4c = 0.92–1.08, 4v = 1.42–1.60, 5x = 0.72–1.14, ac = 2.60–3.45, M = 0.28–0.40.

Holotype. ♂ ( MPMP), “ Gandara , Samar, Philippines, 2.xii.2012, ex Alocasia macrorrhizos, P.J. Matthews, M. Medecilo & J.R. Castillo ”.

Paratypes. Philippines: 10♂, 10♀, same data as the holotype ( MPMP, SEHU) .

Distribution. Philippines (Samar).

Remarks. This species was placed as the basal branch sister to the clade (BP = 100) consisting of the remaining four species of the cristata complex ( Fig. 13 View FIGURE 13 ), lacking the following synapomorphies for the latter clade: anterior dorsocentral setae just beside transverse suture (ch.7-1), epandrium posteroventrally roundish (ch.30-1) and with setae thicker than cercal setae (ch.32-1), phallapodeme less sclerotized thin plate (ch.45-2) directed nearly perpendicular to axis of phallal sheath (ch.46-1), and hypoproct not pubescent (ch.48-1). In addition, within the latter clade, C. sulawesiana , C. kinabaluana sp. nov. and C. kotana sp. nov. formed a clade (BP = 75; Fig. 13 View FIGURE 13 ) supported by an autapomorphy, the short (<0.05 mm) processes on the male sternite VI (ch.25-1; Fig. 9I–K View FIGURE 9 ). Furthermore, C. matthewsi sp. nov. somewhat resembles C. grandis sp. nov. in the morphology of periphallic organs ( Figs 16D View FIGURE 16 , 23C View FIGURE 23 ), but can be distinguished from it by their diagnostic characters.