Colocasiomyia luciphila Zhang & Gao & Takano & Yafuso & Suwito & Meleng & Toda 2023, sp. nov.
Creators: name: Zhang, Guang
name: Gao, Jian-Jun
name: Takano, Kohei Takenaka
name: Yafuso, Masako
name: Suwito, Awit
name: Meleng, Paulus Ak
name: Toda, Masanori J.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Drosophilidae
Colocasiomyia
Colocasiomyia luciphila

description: 3) Colocasiomyia luciphila Zhang & Toda, sp. nov.
(Figs 2–12C, 14C)
Colocasiomyia sp.5 aff. nepalensis: Fartyal et al., 2013: 769.
Diagnosis. Antennal, first flagellomere approximately 2.4 times as long as pedicel; arista approximately 1.6 times as long as first flagellomere (Fig. 3C). Fore tarsomere II with 2 pegs; smaller peg slightly longer than 1/2 of larger one (Fig. 9C 1). Male sternites III and IV longer than wide; V+VI concave on distal margin (Fig. 10C 1). Female sternites III–VI longer than wide; VII much wider than long, slightly convex on distal margin (Fig. 10C 2). Surstylus with 6–7 stout, longer, peg-like teeth nearly uniform in thickness (Fig. 11-1C 1,2). Pregonites apically roundish, smooth on ventral margin (Fig. 11-1C 4a). Epigynium with 2–6 small sensilla per side near lower posterior margin (Fig. 12C 1). Distal, narrow portion of hypogynial valve half as long as basal, broad portion (Fig. 12C).
Description (♁ and ♀). Head. Antennal pedicel grayish brown. Distance between antennal scapes as wide as scape diameter (Fig. 2C 2). Facial carina narrower than 1st flagellomere (Fig. 2C 2). Supracervical setae 6–8 and postoculars 13–18 per side (Fig. 4C). Cibarial projections at anterolateral corners slightly longer than width of anterior margin; medial sensilla approximately 3–4 per side (Fig. 5C 2). Prementum and neighboring lateral membrane with 7–8 setae per side (Fig. 5C 2). Labellum with 11–13 pseudotracheae per side (Fig. 5C 1).
Thorax. Prescutellar, acrostichal setae only slightly longer than acrostichal setulae (Fig. 6C). Only one prominent katepisternal seta longer than acrostichal setulae (Fig. 7C).
Legs grayish brown, except for all tarsi pale grayish yellow (Fig. 14C). Fore, mid and hind tarsomere Is as long as II+III, II+III+IV and II+III+IV+V, respectively (Fig. 9C).
Abdomen. Tergites dark grayish brown (Fig. 14C). Female tergite VII mid-dorsally separated into 2 lateral plates.
Male terminalia. Epandrium with approximately 4 long setae only on lateral to ventral portion (Fig. 11-1C 1). Cercus entirely pubescent, round on ventral margin, with 28–29 setae (Fig. 11-1C 1). Phallal sheath partly pubescent (Fig. 11-1C 4,b).
Female terminalia. Perineal membrane without patch of dense, distinct warts.
Measurements (holotype /range in 1♁ and 3♀ paratypes, in mm): BL = 1.51/♁ 1.59, ♀ 1.40–1.92; ThL = 0.60/♁ 0.60, ♀ 0.48–0.75; WL = 1.22/♁ 1.23, ♀ 1.06–1.55; WW = 0.57/♁ 0.61, ♀ 0.50–0.73.
Indices (holotype /range in 1♁ and 3♀, or less if noted, paratypes, in ratio): FW/HW = 0.48/0.49–0.55; ch/o = 0.29/0.33–0.38; prorb = 0.86/0.82–1.08; rcorb = 0.32/0.29–0.40; vb = 0.17/0.18–0.25 (3♀); dcl = 0.39/0.35– 0.40 (1♁ and 2♀); presctl = 0.20/0.21–0.25 (1♁ and 2♀); sctl = 0.56/0.52–0.60; orbito = 0.45/0.33–0.47; dcp = 0.54/0.49–0.59; sctlp = 0.93/0.88–1.03; C = 1.57/1.49–1.64; 4c = 1.61/1.39–1.64; 4v = 2.39/2.20–2.63; 5x = 2.61/2.62–2.75; ac = 3.27/2.49–3.09; M = 0.90/0.78–0.92; C3F = 0.60/0.49–0.72.
Holotype. ♁ (RDID), “ Lambir Hills National Park, Sarawak, Malaysia, 25–26.i.2012, ex light trap (LT-35), M.J. Toda ”.
Paratypes. Malaysia: 5♀, same data as the holotype (SEHU); 1♀, same except for 26–27.i.2012, 1♀, same except for 23.i.2012, ex florescent light, 1♀, same except for 25.i.2012, ex florescent light (RDID); 1♁ (#05225), same data as the holotype, 1♀ (#05223), same except for 23–24.i.2012 (Lot #229), 1♀ (#05224), same except for 24–25.i.2012 (Lot #230) (KIZ).
Distribution. Malaysia (Sarawak).
Remarks. This species resembles C. nepalensis in having only one prominent, katepisternal seta and two pegs less different in length on the fore tarsomere II, but can be distinguished from it by the arista 1.6 times as long as first flagellomere (in C. nepalensis: “2.5× the length of flagellomere I”; Grimaldi 1991), cibarial medial sensilla in parallel rows as wide as sensilla campaniformia (narrower than the latter; “ Fig. 7 ” in Grimaldi 1991), the facial carina narrower than 1st flagellomere (wider than the latter; “ Fig. 6 ” in Grimaldi 1991), and the absence of membranous aedeagus (“Distiphallus fusiform, apically with fine spicules, covered with membrane”). On the other hand, the following characters suggest some relatedness to the oligochaeta species subgroup described below: only one prominent, katepisternal seta; prescutellar, acrostichal setae less differentiated; and male sternites III and IV and female III–VI longer than wide.
Etymology. Referring to its nature of being attracted to light.
description: Published as part of Zhang, Guang, Gao, Jian-Jun, Takano, Kohei Takenaka, Yafuso, Masako, Suwito, Awit, Meleng, Paulus Ak & Toda, Masanori J., 2023, Phylogenetic classification and palm-inflorescence anthophily of the Colocasiomyia zeylanica species group (Diptera: Drosophilidae), with descriptions of five new species, pp. 201-238 in Zootaxa 5278 (2) on pages 224-225, DOI: 10.11646/zootaxa.5278.2.1, http://zenodo.org/record/7905995