Phortica (Ashima) akutsui Toda, 2020

Toda, Masanori J., Bänziger, Hans, Sati, Pradeep C., Fartyal, Rajendra S., Suwito, Awit & Katoh, Toru, 2020, Taxonomy and evolution of asymmetric male genitalia in the subgenus Ashima Chen (Diptera: Drosophilidae: Phortica Schiner), with descriptions of seven new species, Zootaxa 4789 (1), pp. 1-54 : 24-27

22) Phortica (Ashima) akutsui Toda , sp. nov.

( Fig. 7 )

Diagnosis. Arista with arb = 2–3/0 (ch.6-2; Fig. 7C ); apical, leaf-like expansion somewhat triangular, distally dilated, apically nearly flat ( Fig. 7C ); abdominal sternites IV and V dense setulae on medial surface (ch.27,28-1; Fig. 7D ); surstylus without peg-like teeth (ch.37-1; Fig. 7E ).

Description (not repeating characters common to P. halimunensis ). Supracervical setae 14–15. Dorsomedial, tentorial apodeme 3/4 as long as basal, parallel portion of dorsolateral, tentorial apodeme. Cibarial, medial sensilla approximately 6 per side; posterior sensilla 5–7 per side. Fore and hind tarsomere Is as long as rest and 3 succeeding tarsomeres together, respectively. Aedeagal, median rod less sclerotized (ch.58-2; Fig. 7G ).

Measurements (holotype, in mm): BL = 2.84, ThL = 1.35, WL = 2.02, WW = 0.95.

Indices (holotype, in ratio): FW/HW = 0.42, ch/o = 0.07, prorb = 1.25, rcorb = 0.62, vb = 0.48, dcl = 0.49, presctl = 0.42, sctl = 1.02, sterno = 1.06, orbito = 2.48, dcp = 0.24, sctlp = 0.92, C = 2.30, 4c = 1.42, 4v = 2.78, 5x = 1.09, ac = 3.20, M = 0.68, C3F = 0.62.

Holotype. ♂ ( BORN), “ Deramakot Forest Reserve , Sabah, Malaysia, 5°19’–20’N, 117°20’ –42’E, 150 m a.s.l., 31.vii–9.viii.2003, ex banana-trap at 31.5 m from the ground, K. Akutsu ”. Distribution. Borneo (Sabah). Remarks. This species resembles P. mediarista in having the less sclerotized aedeagal, median rod submedially with loop-like structure, but can be distinguished from it by the diagnostic characters. Etymology. Patronym, dedicated to Dr. Kosuke Akutsu, who collected the specimen.

Figures

FIGURE 7. Phortica (Ashima) akutsui Toda, sp. nov. (♂ holotype). A, Head (caudal view); B, frons; C, antenna; D, abdominal sternites; E, periphallic organs (caudolateral view); F, postgonites (anteroventral view); G, H, phallic organs (lateral and ventral views, respectively). Abbreviations: dl t a, dorsolateral, tentorial apodeme; pocl s, postocular setae. Scale bars: 0.1 mm in B, C, E–H; 0.5 mm in A, D.