Uranotaenia (Uranotaenia) coatzacoalcos Dyar & Knab

Uranotaenia (Uranotaenia) coatzacoalcos Dyar & Knab, 1906: 186 (larva). Type locality: Mexico, Veracruz, Santa Lucrecia. Additional references: Howard et al. 1912: pl. 135, fig. 512 and pl. 138, fig. 538; Howard et al. 1917: 916 (larva); Dyar 1928: 424 (female, male, larva); Lane 1953: 572 (female, male, larva; includes Ur. typhlosomata Dyar & Knab and Ur. basalis Howard, Dyar & Knab as synonyms); Galindo et al. 1954: 136 (male, female, larva; resurrection of Ur. typhlosomata from synonymy).

Uranotaenia basalis Howard, Dyar & Knab, 1917: 917 . Type locality: Mexico, [Veracruz], Córdoba (male, larva).

Material examined. Mexico, Veracruz, municipality of Coatepec, Congregación Tapachapan, November 25, 2017, 2 ♀, 3 ³, 5 pupal exuviae, 5 larval exuviae (of the same specimens), 1 larva, tropical montane cloud forest (19° 27′ 18″ N 96° 58′ 49″ W). Note: Ur. coatzacoalcos was found in artificial containers filled with colored turbid water with plant debris located at the periphery of a house in the periurban area of Coatepec. Immature stages were found in association with Lutzia bigoti (Bellardi) .

The species was identified based on larval, adult female, and male genitalia characteristics (see Figs. 1, 3, 4); the respective pupal exuviae were used for description.

Larva (Fig. 1 a–f). Chaetotaxy in Table 1. Head: Head capsule dark brown. Antenna: With small spicules; seta 1-A single, small, inserted before middle of antenna (Fig. 1b). Abdomen (Fig. 1a): Comb plate with 9 scales. Pecten with 15 spines that do not extend beyond mid-length of siphon; seta 1-S inserted near mid-length of siphon before last spine of pecten; siphon index about 3.7 (Fig. 1c). Saddle with strong spines along posterior margin that differ in size (Fig. 1d); saddle/siphon index about 1.75. Anal papillae longer than saddle, dorsal papillae slightly longer than ventral papillae (Fig. 1c).

* Number of terminal branches (forked seta).? Not observed.

Pupa (Fig. 2 a–e). Chaetotaxy in Table 2. Cephalothorax: Lightly tanned to yellowish, darker in postscutal area. Trumpet: Cylindrical, moderately dark, tracheoid area dark. Length, ♀ 0.51/0.52 (n = 2), ³ 0.49–0.52 (n = 3; mean 5.1; sd 0.03); width, ♀ 0.08/0.09 (n = 2), ³ 0.07–0.09 (n = 3; mean 0.08; sd 0.01); trumpet index, ♀ 5.6/6.5 (n = 2), ³ 5.7–7.4 (n = 3; mean 6.44; sd 0.757;); pinna, ♀ 0.16/0.17 (n = 2), ³ 0.13–0.16 (n = 3; mean 0.14; sd 0.023); meatus, ♀ 0.35 (n = 2), ³ 0.36–0.37 (n = 3; mean 0.36; sd 0.003); tracheoid area about 2.3 from base (n = 5; mean 2.16; sd 0.028) (Fig. 2a). Abdomen: Length, ♀ 2.55/2.75 (n = 2), ³ 2.12–2.5 (n = 3; mean 2.35; sd 0.63). Paddle: Inner and outer margins with strong serrations of different sizes from mid-length to apex (Fig. 2e). Midrib conspicuous, almost reaching apex. Length, ♀ 0.72/0.75 (n = 2), 0.71–0.73 (n = 3; mean 0.72; sd 0.01); width, ♀ 0.5 (n = 2), ³ 0.48–0.5 (n = 3; mean 0.49; sd 0.01); paddle index, ♀ 1.44/1.5 (n = 2), ³ 1.42–2 (n = 3; mean 1.63; sd 0.1). Genital lobe: Slightly yellowish, with conspicuous spicules in both sexes. Length, ♀ 0.1/0.11 (n = 2) (Fig. 2c), 0.19–0.2 (n = 3; mean 0.2; sd 0.01) (Fig. 2d).

* Number of terminal branches (forked seta).

+ Number of basal branches.

? Not observed.

Female (Fig. 3b,c). Medium-sized mosquito, wing length 2.9–3.0 mm. Head: Proboscis dark brown, about 0.9 length of forefemur, swollen before apex. Maxillary palpus short with dark-brown scales on all surfaces. Clypeus nude. Occiput clothed with large dark-brown flat scales. Vertex and ocular line with silvery-white scales. Thorax: Antepronotum with conspicuous patch of silvery-white scales. Dorsocentral setae very large. Scutum covered with dark to dark-brown scales, with a conspicuous line of silvery-white scales from scutal angle to base of wing. Pleura dark-brown with a line of silvery-white scales extending nearly horizontal on mesokatepisternum. Femora with silvery-white scales on ventral surface. Femora and tibiae with conspicuous spots of silvery-white scales at apices. Midtibia with a patch of silvery-white scales on apical part (0.12 of total length of midtibia). Foretarsus completely covered with dark-brown scales. Midtarsomeres 1 and 2 with dark-brown scales; 3–5 with silvery-white scales. Hindtarsomeres 4, 5, and 0.45 of 3 with silvery-white scales, other tarsomeres with dark-brown scales. Wing with dark scales except for a line of silvery-white scales along radial vein from base to mid-length (before the fork). Abdomen: Tergum I covered with silvery-white scales except for small lateral patches of dark scales. Terga II–VII with a U-shaped basal patch of silvery-white scales in central part (approximately 0.45 of each segment), rest of the terga with dark scales.

Male (Figs 3a, 4 a–c). Body coloration and characteristics similar to female. Wing length 2.4–2.6 mm (Fig. 3a). Genitalia: Tergum IX with proximal margin deeply emarginate, subquadrate; plate transversally directed with a pair of inconspicuous nude thumb-like lobes at distal margin which are widely separated at middle by a shallow nearly straight interlobular membranous margin (Fig. 4c). Gonocoxite conical, length about 1.5 basal width, with a poorly developed basal mesal lobe bearing a group of non-specialized setae that are somewhat larger than those nearby. Gonostylus short, about 0.5 length of gonocoxite, narrow at middle, ending in a rounded apical knob with one small gonostylar claw, and with patch of short spicules (Fig. 4a). Proctiger triangular in dorsal view, membranous and nude. Lateral plate of aedeagus heavily sclerotized, tergal arm with blunt apex and a preapical long external projection, sternal arm with 5 small teeth, all anteriorly directed; aedeagus short, lanceolate, laterally directed; parameres well developed, with blunt apex reaching level of apex of aedeagus (Fig. 4b).