Homoneura (Homoneura) acrostichalis Meijere 1915
Creators: name: Shi, Li
name: Yang, Ding
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Lauxaniidae
Homoneura
Homoneura acrostichalis

description: Homoneura (Homoneura) acrostichalis (Meijere, 1915)
(Figs 25–33)
Lauxania acrostichalis Meijere, 1915: 51. Type locality: Cocos Islands. Lectotype male in ZMAN. Homoneura acrostichalis: Malloch, 1929: 207. Sasakawa & Ikeuchi, 1985: 494; Sasakawa, 1997: 142; 2002: 54. Shewell in Delfinado & Hardy, 1977: 200.
Diagnosis. Oc short, about half length of anterior or; anterior or as long as or slightly shorter than posterior or. Arista almost bare, with microscopic ray. Mesonotum with a pair of strong acr situated nearly at horizontal level of second post-sutural dc (occasionally 2–3 pairs of strong acr, then only one pair strongest which is situated nearly at horizontal level of second post-sutural dc).
Redescription. MALE. Body length 3.4–3.9 mm, wing length 3.1–4.0 mm. FEMALE. Body length 3.0– 3.7 mm, wing length 2.8–3.8 mm.
Head (Figs 27, 28) yellow. Frons yellow to pale brown, slightly longer than wide and parallel-sided, with sparse short setulae on anterior 1/2, if yellow, a pair of brown medial stripes visible, if pale brown, a narrow stripelike area surrounded base of two or grayish shining, occasionally a thin yellow stripe extending from anterior margin to ocellar triangle; ocellar triangle yellow, oc short, about half length of anterior or; anterior or as long as or slightly shorter than posterior or. Gena about 1/5 height of eye. Parafacial with a row of setulae on ventral 1/2 of inner margin (middle several longer than top and bottom several). Antenna yellow to brownish yellow (occasionally brown on upper 1/2 or only upper margin of 1st flagellomere), 1st flagellomere about 1.5 times as long as high; arista almost bare (with microscopic ray), black except for brownish base. Proboscis and palpus yellow.
Thorax (Figs 26, 28) yellow to brown. Mesonotum with 0+3 dc (1st post-sutural dc clearly behind transverse suture); acr in irregular 8 rows, with a pair of strong acr situated nearly at horizontal level of second post-sutural dc (occasionally 2–3 pairs of strong acr, then only one pair strongest which is situated nearly at horizontal level of second post-sutural dc); prsc shorter than 1st post-sutural dc. Scutellum yellow. Legs yellow. Fore femur with 3–4 pv, 7–8 pd, and ctenidium with 10–14 short setae (female often 10–12, male often 12–14); fore tibia with 1 long preapical ad and 1 short apv. Mid femur with 5–6 a and 1 app; mid tibia with 1 strong preapical ad and 2 strong apv (occasionally female with 1 apv). Hind femur with 1 weak preapical ad and 1 av on apical 1/3; hind tibia with 1 weak preapical ad (occasionally male with 2 preapical ad) and 1 apv. Wing (Fig. 25) clear; subcostal cell hyaline; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in proportion of 6.7:1.7:1; r-m slightly behind middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1:1.2; ultimate section of CuA1 about 1/8 of penultimate. Halter yellow.
Abdomen (Fig. 29) yellow to brownish yellow, tergite 5 with 1–3 black round spots (only a medial spot, or a pair of lateral spots or both, occasionally no spot, size of spots variable in individuals from different geographical regions) [part of specimens from Guam, male tergites 3–6 (female 3–7) each with two black irregular lateral spots (size variable), male and female tergites 4–6 each with a black medial spot]. Male tergites 5–6 with densely small spines on ventrolateral margins in ventral view. Male genitalia (Figs 30–33): syntergosternite broad and nearly semicircular and partly fused with tergite 6 at middle in posterior view, about twice as high as tergite 5; surstylus small, acute apically in lateral view; hypandrium nearly bar-like in ventral view; postgonite large and curved with a small acute process and three setulae in ventral view; aedeagus wide with two pairs of lateral processes at middle and a pair of dorsal processes apically in ventral view; aedeagal apodeme shorter than aedeagus.
Material examined. 1 ♂ (USNM), CHINA, Formosa (Taiwan): Kankau (Koshun), 1912, H. Sauter (det. J. R. Malloch); 1 ♀ (USNM), CHINA, Formosa (Taiwan): Chipun, VII. 1912, H. Sauter (det. J. R. Malloch); 1 ♂ (USNM), Kiribati: Gilbert Islands, Tarawa, III. 1951, R. Catala (det. Sabrosky); 2 ♂, 2 ♀ (USNM), Guam Island, D. T. Fulloway (no collecting date); 10 ♂, 4 ♀ (USNM), Micronesia: Ulithi atoll, Fassarai Island, VII. 10. 1946, H. K. Townes, No. 1052 (det. Shewell, 1963).
Distribution. Oriental: China (Taiwan), Sri Lanka, Japan (Ryukyu Islands); Australian/Oceanian: Australia, Micronesia Solomon Islands. Cocos (Keeling) Islands; American Samoa, Belau, Bonin Islands, Guam, Kiribati (Gilbert Islands), Marshall Islands, Niue, Northern Marianas, Volcano Islands, Wake I, Western Samoa.
description: Published as part of Shi, Li & Yang, Ding, 2014, Supplements to species groups of the subgenus Homoneura in China (Diptera: Lauxaniidae: Homoneura), with descriptions of twenty new species, pp. 1-117 in Zootaxa 3890 (1) on pages 17-18, DOI: 10.11646/zootaxa.3890.1.1, http://zenodo.org/record/250637