Culex (Culex) bidens Dyar

Rivera-García, Karina D. & Ibáñez-Bernal, Sergio, 2018, Description of the pupa of Culex (Culex) bidens Dyar (Diptera: Culicidae), Zootaxa 4521 (2), pp. 275-280 : 276-277

Culex (Culex) bidens Dyar

Culex (Culex) bidens Dyar, 1922: 190 (male, female). Type locality: Bolivia, [Beni], Rosario. Additional references: Lane, 1953: 351 (syn. with Cx. virgultus = Cx. declarator ); Carpenter & LaCasse, 1955: 298 (as synonym of Cx. virgultus ); Stone, 1956: 341 ( Cx. virgultus as unrecognized species, and resurrection of Cx. declarator from synonymy with Cx. virgultus Theobald of Lane, 1953); Stone & Knight, 1957: 44 (lectotype designation); Bram, 1967: 35 (male, female, larva); Belkin et al., 1968: 20 (source of original type material); Harbach et al., 1986: 139 (male; recognition of Cx. bidens and Cx. interfor ); Sallum et al., 1996: 563 (description of male, female, pupa, larva of Cx. interfor and comparison with Cx. bidens ); Rossi & Martínez, 2003: 471 ( Uruguay record); Laurito & Almirón, 2015 (male genital variations of Cx. bidens and Cx. interfor ).

Material examined. Mexico, Veracruz, municipality of Jamapa, La Matamba , 21 February 2017, 31 ♂, 9 ♀, 40 pupal exuviae, 38 larval exuviae (individual rearings); 30 November 2017; 1 ♂, 1 pupal exuviae, 1 larval exuviae (of the same specimen), floodplain forest (19° 01´20.8´´ N, 96° 16´56.2´´ W); 30 June 2017, 5 ♂, 10 ♂, 12 pupal exuviae, 4 larval exuviae, freshwater lagoon (19° 01´11.8´´ N, 96° 15´58.5´´ W) (individual rearings). Note: The number of adults, and pupal and larval exuviae do not coincide because in some cases the exuviae could not be recovered or the specimens mounted on slides were not useful for identification.

Species identification was based on characteristics of the male genitalia (see Fig. 1c,d,e ), and the respective pupal exuviae used for the description.

Description of the pupa ( Fig. 1a,b ). Chaetotaxy in Table 1. Cephalothorax: Slightly yellowish to tan. Trumpet: Cylindrical, moderately tanned, tracheoid area darker. Length, ♀ 0.61–0.66 (0.61; sd = 0.02; n = 52), ♂ 0.51–0.65 (0.6; sd = 0.03; n = 52); trumpet index, ♀ 5.16–7.33 (6.0; sd = 0.69; n = 52), ♂ 5.45–7.28 (5.45; sd = 0.63; n = 52); pinna, ♀ 0.12–0.19 (0.15; sd = 0.02; n = 52), ♂ 0.08–0.16 (0.12; sd = 0.02; n = 52); tracheoid area extending from base, ♀ about 0.28 and ♂ about 0.26. Abdomen: Slightly yellowish to tan. Length, ♀ 2.55–2.77 mm (2.62; sd = 0.07; n = 52), ♂ 2.35–2.62 mm (2.35; sd = 0.11; n = 52). Genital lobe: Slightly yellowish. Length, ♀ 0.17–0.19 (0.18; sd = 0.005; n = 52), ♂ 0.29–0.35 (0.33; sd = 0.01; n = 52). Paddle: Ovoid, outer margin with minute spicules from base to 0.49 length. Length, ♀ 0.76–0.88 (0.8; sd = 0.03; n = 52), ♂ 0.65–0.83 (0.8; sd = 0.06; n = 52); paddle index, ♀ 1.35–1.66 (1.44; sd = 0.011; n = 52), ♂ 1.35–1.59 (1.43; sd = 0.08; n = 52). Midrib distinct except at apex, as it does not reach the margin.

*Number of basal branches.

Figures

FIGURE 1. Culex (Culex) bidens. Pupa: a) Cephalothorax; b) abdomen. Male genitalia: c) Gonocoxite and gonostylus (lateral view); d) lateral plate, lateral surface; e) dorsal aspect of phallosome and proctiger. CT, cephalothorax; GL, genital lobe; Pa, paddle; I–VIII = abdominal segments I–VIII; 1–11,14 = setal numbers for specified areas. Note: Abdominal segment IX is not labelled but seta 1 of that segment is shown. Scales in millimeters.