Uranotaenia (Uranotaenia) coatzacoalcos Dyar & Knab

Rivera-García, Karina D., Rísquez-Pérez, Abril & Ibáñez-Bernal, Sergio, 2019, Description of the pupa and additional characters of the fourth-instar larva female, and male genitalia of Uranotaenia (Uranotaenia) coatzacoalcos Dyar & Knab, with keys for the identification of Mexican species of Uranotaenia (Diptera: Culicidae), Zootaxa 4608 (2), pp. 247-260 : 249-252

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 ).

Figures

FIGURE 1. Uranotaenia (Uranotaenia) coatzacoalcos. Larva: a) Thorax and abdomen (segments I–VI); b) head; c) terminal part of abdomen (segments VII,VIII,X and siphon); d) siphon marginal spicules; e) comb scale; f) pecten spine. C, head; A, antenna; P, prothorax; M, mesothorax; T, metathorax; S, siphon; I–VIII,X, abdominal segments I–VIII,X; 0–14 = setal numbers on specified areas. Scales in mm.

FIGURE 2. Uranotaenia (Uranotaenia) coatzacoalcos. Pupa: a) Cephalothorax; b) abdomen; c) female genital lobe; d) male genital lobe; e) paddle marginal serrations. CT, cephalothorax; Pa, paddle; Se, paddle marginal serrations; GL, genital lobe; Pr, proctiger; Ce, cercus; I–IX, abdominal segments I–IX; 0–14 = setal numbers on specified areas. Scales in mm.

FIGURE 3. Uranotaenia (Uranotaenia) coatzacoalcos. Adult male and female: a) Male (lateral view); b) female (lateral view); c) abdomen of female (dorsal view).

FIGURE 4. Uranotaenia (Uranotaenia) coatzacoalcos. Male genitalia: a) tergum IX (dorsal view); b) lateral aspect of genitalia; c) dorsal aspect of genitalia. BML, basal mesal lobe; Gc, gonocoxite; GC, gonostylar claw; Gs, gonostylus; LP, lateral plate; Par, paramere; Pr, proctiger; Ta, tergal arm of lateral plate of aedeagus; Sa, sternal arm of lateral plate of aedeagus. Scales in mm.