Chaetonerius colavitei, Sepúlveda & Marinoni, 2021

Sepúlveda, Tatiana A. & Marinoni, Luciane, 2021, New species of Chaetonerius Hendel (Diptera: Neriidae) from the Oriental Region, Zootaxa 5027 (1), pp. 145-149 : 146-147

Chaetonerius colavitei sp. n.

( Figure 1 )

Type locality. Thailand, Mae Hong Son, Kiew Lom Viewpoint , 19º26’N, 98º19’E .

Type material. Holotype, ♂, THAILAND: Kiew Lom Viewpoint, Rt. 1095, 19°26’N, 98°19’E, 1700 m, 10.xi.2012, A. Freidberg, 161569 [ TAUI #894 ] ( Figs 1A, 1B ) . Paratypes, THAILAND: 1 ♂, NW, Soppong , 1 km S, 27.x.2002. A. Freidberg, SMNH-TAUI, 205919 [ TAUI #942 (dissected)] ; 1 ♀, NW, Soppong , 1 km S, 27.x.2002. A. Freidberg, SMNH-TAUI, 205920 [ TAUI#943 ] . MALAYSIA: 1 ♂, Selangor, Ulu Gombak , 800 ft, 10–12.ix.1983, pres. J. W. Ismay, BM 1984-71 , Attracted to young shoots of giant bamboo [ NHMUK #2008 (dissected)] .

Diagnosis. Arista apical; first flagellomere with pointed apex with dorsal margin straight and ventral margin curving dorsally in lateral view; head mostly yellow except for the dark-brown posterior third of frons towards median occipital sclerite and the anterior third of front-orbital plate towards parafacial, these areas can be larger or shorter, being that the middle and posterior area of the fronto-orbital plate are always yellow; two postocular setae; dorsal scutum with dorsocentral yellow and gray pruinose stripe.

Male (holotype). Body length 7.6 mm. Head. Pedicel very short, length is half width; with one dorsal and one ventro-apical outstanding setae; inner process of pedicel narrow triangular and slightly positioned on dorsal half. Scape short, no longer than width and narrow at base. Antennal base small and opaque. Anterior margin of frons rounded. Parafacial dorsal half brown and opaque; occiput narrow and mostly yellow, slightly brown on dorsal half and with ovate brown spot on ventral half. Frontal vitta mostly yellow, with lateral black spot on anterior margin and a black median spot posteriorly, covering the ocellar triangle; fronto-orbital plate yellow and covered with white pruinescence; anterior fronto-orbital seta absent; mid and posterior fronto-orbital setae as long as outer vertical seta and longer than inner vertical seta. Postgena with numerous yellow setulae posteriorly. Palpus widened and brown. Thorax. Yellow acrosthical stripe on postsutural scutum; one presutural dorsocentral seta and three postsutural dorsocentral setae. Pleuron partially yellow with brown stripe from ventral proepisternum towards anterior anepisternum and katepisternum; proepisternum with one ventral spine-like seta and several yellow setulae; discal scutellar seta length is one third the length of apical scutellar seta. Coxae yellow (brown in other specimens); fore coxa with two antero-apical setae and one anterolateral seta; mid and hind coxa with two lateral setae. Femora yellow with brown apex; fore femur without ventral spine-like setae. Wing. Wing length 7.3 mm, width 2.0 mm. Basicosta with two setae. Abdomen. Mostly brown, except for syntergite 1+2 with lateral and submedian yellow lines and tergite 6 with lateral yellow spot on anterior margin (other specimens colored as the female); sternite 6 extended laterally. Syntergosternite 8 and epandrium yellow; syntergosternite 8 slightly shorter than epandrium; epandrium short, extends forward to posterior margin of segment 4 of abdomen; cercus linear, narrowing towards apex; cercus length is near half epandrium length; surstlylus linear and narrow, length is 2/3 the length of cercus; distiphallus partially sclerotized at the proximal half and the median area bears one membranous cylindrical hook and a slightly sclerotized area ( Fig. 1E , pointed circumference), followed by a flattened membranous tube which constitutes the distal part of the distiphallus.

Female. Body length 7.3 mm. Wing length 7.1 mm, width 2.0 mm. First flagellomere shorter than male, length is 1.5 times the width; abdomen with submedian yellow line from syntergite 1+2 to tergite 5 and lateral spot on tergite 6 placed marginally. Oviscape yellow with a median brown line and brown apex.

Etymology. The name Chaetonerius colavitei sp. n. honors our colleague Dr. Alessandre Pereira-Colavite, for his valuable contribution to our knowledge of Neriidae through his database of manuscripts.

Distribution. Thailand, Malaysia (Selangor), Taiwan ( Figs 1F, 1G ).

Figures

FIGURE 1. Chaetonerius colavitei sp. n. A−B, holotype, ♂. A, Habitus, lateral view; B, Habitus, dorsal view. C−E, Specimen NHMUK #2008, ♂. C, Head, laterodorsal; D, Wing; E. Terminalia, lateral. F−G, Males in combat (images © Taiwan-Awei). Abbreviations: st 6, sternite 6; syntgst 8, syntergosternite 8; tg 6, tergite 6.