Colocasiomyia pinangae 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 pinangae

description: 1) Colocasiomyia pinangae Zhang & Toda, sp. nov.
(Figs 2–12A, 14A)
Colocasiomyia sp.1 aff. nepalensis: Sultana et al., 2006: 694; Fartyal et al., 2013: 768.
Diagnosis. Surstylus with 5–7 stout, short, peg-like teeth (Fig. 11-1A 2). Pregonites apically round, with coarse serrations on ventral margin (Fig. 11-1A 4). Epigynium with 11–12 sensilla per side near lower posterior margin (Fig. 12A 1). Distal, narrow portion of hypogynial valve slightly shorter than basal, broad portion (Fig. 12A).
Description (♁ and ♀). Head. Antennal pedicel blackish brown; first flagellomere approximately 1.7 times as long as pedicel; arista approximately 2.1 times as long as first flagellomere (Fig. 3A). Distance between antennal scapes narrower than scape diameter (Fig. 2A 2). Facial carina wider than 1st flagellomere (Fig. 2A 2). Supracervical setae 4–7 and postoculars 17–18 per side (Fig. 4A). Cibarial projections at anterolateral corners as long as width of anterior margin; medial sensilla 2–4 per side (Fig. 5A 2). Prementum and neighboring lateral membrane with 7–8 setae per side (Fig. 5A 2). Labellum with 10 pseudotracheae per side (Fig. 5A 1).
Thorax. Two katepisternal, prominent setae longer than acrostichal setulae (Fig. 7A).
Legs grayish brown, except for fore tibiae and all tarsi pale grayish yellow (Fig. 14A). Fore tarsomere I slightly longer than tarsomeres II and III combined; mid I as long as II+III+IV; hind I slightly longer than II+III+IV (Fig. 9A). Fore tarsomere II with 1 large and 1 small pegs; latter 1/3 as long as former (Fig. 9A 1).
Abdomen. Tergites blackish brown (Fig. 14A). Male sternites III and IV as wide as long; V+VI distally deeply bilobed (Fig. 10A 1). Female sternites III–V as wide as long; VI wider than long; VII wider than long plate bilobed in distal half (Fig. 10A 2). Female tergite VII caudomedially deeply notched.
Male terminalia. Epandrium with 2–4 long setae only on lateral to ventral portion (Fig. 11-1A 1). Cercus nearly entirely pubescent except for small, anteroventral, expanded flap, with approximately 37 setae (Fig. 11-1A 1). Phallal sheath not pubescent (Fig. 11-1A 4).
Female terminalia. Perineal membrane with patch of dense, distinct warts.
Measurements (holotype /range in 6♁ and 5♀ paratypes, in mm): BL (straight distance from anterior edge of pedicel to tip of abdomen) = 1.45/♁ 1.29–1.54, ♀ 1.43–1.62; ThL (distance from anterior notal margin to apex of scutellum) = 0.58/♁ 0.59–0.67, ♀ 0.60–0.67; WL (distance from humeral cross vein to wing apex) = 1.22/♁ 1.25–1.40, ♀ 1.23–1.44; WW (maximum wing width) = 0.60/♁ 0.58–0.66, ♀ 0.59–0.67.
Indices (holotype /range in 6♁ and 5♀, or less if noted, paratypes, in ratio): FW/HW (frontal width / head width) = 0.55/0.53–0.60; ch/o (maximum width of gena / maximum diameter of eye) = 0.36/0.29–0.40; prorb (proclinate orbital seta length / posterior reclinate orbital seta length) = 0.85/0.84–0.97 (2♁, 1♀); rcorb (anterior reclinate orbital seta length / posterior reclinate orbital seta length) = 0.30/0.23–0.40 (3♁, 1♀); vb (subvibrissal seta length / vibrissa length) = 0.33/0.22–0.32; dcl (anterior dorsocentral seta length / posterior dorsocentral seta length) = 0.46/0.44–0.71 (4♁, 4♀); presctl (prescutellar acrostichal seta length /posterior dorsocentral seta length) = 0.42/0.25–0.40 (6♁, 4♀); sctl (basal scutellar seta length / apical scutellar seta length) = 0.54/0.54–0.63 (6♁, 4♀); sterno (anterior katepisternal seta length / posterior katepisternal seta length) = 1.00/0.94–1.26; orbito (distance between proclinate and posterior reclinate orbital setae / distance between inner vertical and posterior reclinate orbital setae) = 0.35/0.32–0.51; dcp (distance between ipsilateral dorsocentral setae / distance between anterior dorsocentral setae) = 0.50/0.57–0.65; sctlp (distance between ipsilateral scutellar setae / distance between apical scutellar setae) = 1.07/0.86–1.03; C (2nd costal section between subcostal break and R 2 +3 / 3rd costal section between R 2 +3 and R 4 +5) = 2.04/1.70–2.16; 4c (3rd costal section between R 2 +3 and R 4 +5 / M 1 between r-m and dm-m) = 1.46/1.30–1.54; 4v (M 1 between dm-m and wing margin / M 1 between r-m and dm-m) = 2.86/2.48–2.78; 5x (M 4 between dm-m and wing margin / dm-m between M 1 and M 4) = 3.18/2.50–3.35; ac (3rd costal section between R 2 +3 and R 4 +5 / distance between distal ends of R 4 +5 and M 1) = 2.63/2.24–3.04; M (M 4 between dm-m and wing margin / M 1 between r-m and dm-m) = 1.11/0.87–1.08; C3F (length of heavy setation in 3rd costal section / length of 3rd costal section) = 0.37/0.37–0.49.
Holotype. ♁ (MZB), “ Cibodas, West Java, Indonesia, 12.xii.2004, K. T. Takano / ex inflorescence of Pinanga coronata ”.
Paratypes. Indonesia: 24♁, 26♀, same data as the holotype (MZB, SEHU); 10 ♁, 10♀ (#05160–79), same data as the holotype except for 24.xii.2003 (KIZ).
Distribution. Indonesia (West Java).
Remarks. This species resembles C. nepalensis, but can be distinguished from it in having the shorter arista (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), two equally long katepisternal setae (“Katepisternum … with 1 large seta”), and two pegs much different in size on the fore tarsomere II (“Tarsal segment on foreleg … bearing a pair of black, spine-like setae; medial one slightly longer”).
Etymology. Referring to the host-plant genus Pinanga.
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 222-223, DOI: 10.11646/zootaxa.5278.2.1, http://zenodo.org/record/7905995