Simulium (Hearlea) juarezi Vargas & Díaz Nájera

Coscarón, S., Esquivel, D. R. Miranda, Moulton, J. K., Arias, C. L. Coscarón- & Bernal, S. Ibañez, 2004, Simulium (Hearlea) Vargas, Martínez Palacios, & Díaz Nájera (Diptera: Simuliidae): Taxonomic revision and cladistic analysis, Zootaxa 396, pp. 1-52 : 22-23

Simulium (Hearlea) juarezi Vargas & Díaz Nájera

Figs. 1F, G , 3A , 5N, O.

Simulium (Hearlea) juarezi Vargas & Díaz Nájera 1957: 205 , 262, 304, Figs. 161–169; Díaz Nájera & Vulcano 1962: 100, Figs. 72–75.

Female: Wing length, 3.3–3.8 mm. General coloration blackish brown. Head brown, with frons and clypeus gray pollinose. Scape and pedicel light brown; flagellum dark brown. Palpus and haustellum dark brown. Scutum brown, with grayish pruinosity and yellowish– green to brown decumbent hairs varying in coloration with light position. Scutum with 1+1 submedian vittae that are silvery white with posterior lighting and blackish with anterior lighting, extending from 1+1 subquadrate anterior spots to prescutellar area; median blackish stripe about 3 times wider than silvery submedian stripes ( Figs. 1F, G ); humeral spots light gray pollinose as are narrow lateral borders and prescutellar area. Legs yellowish brown, with apices of femora, tibiae, and tarsomeres dark brown–black. Basal portion of cibarium smooth, with thickened rim, and 1+1 subovoidal sublateral prominences. Abdomen dark brown. Genitalia as in S. capricorne .

Male: Wing length, 3.2–3.6 mm. General coloration as in female but more darkened. Scutum velvety blackish, with anterior third grayish pollinose and separated medially by blackish area ( Fig. 3A ). Legs mostly brownish dark, with closely appressed yellowish brown short hairs and blackish long hairs. Hind basitarsus 4 times longer than broad. Genitalia as in S. capricorne .

Pupa: Cocoon slipper shaped, closed anteroventrally, neatly woven, with reinforced anterior margin and frequently covered by sand particles. Length: basal, 3.4–4.0 mm; dorsal, 3.2–3.5 mm. Frontoclypeus and anterodorsum of thorax with abundant, rounded, variably sized granules. Gill with three semi­membranous branches; medial branch largest, strongly clavate, with numerous tubercles dorsally and annulations basally; ventral branch laterally flattened, subannulated, directed medially; dorsal branch slowly accuminate, subannulated, slightly shorter than ventral branch, directed medially. ( Figs. 5 N, O ).

Larva: (Diagnosis derived from Díaz Nájera & Vulcano, 1962). Length, 7.5 mm. General coloration greenish dorsally and yellowish ventroapically. Cephalic apotome darkened basally and medially. Labral fan with 50 primary rays. Hypostoma with 8–10 lateral setae per side. Postgenal cleft dome shaped, narrowed distally. Posterior circlet with ca. 145 rows of 17 hooks. Rectal papillae trilobed, with 5–7 lobules per lobe (15–21 total), median anterior diverticle larger than others.

Material examined: México: México, Río Frío 3000 m, 1 female, 1 male reared, 1 pupa, 6 September 1969, P. & B. Wygodzinsky ( AMNH) .

Distribution: México: México, Oaxaca, Veracruz, Chiapas and Michoacán.

Discussion: The peculiar expanded, dorsally globulose medial gill branch is diagnostic for this species. The closest species with inflated gill branches is S. contrerense .

Figures

FIGURE 1. Female. A–C. S. (H.) capricorne. A. front; B. fronto­ocular triangle; C. hind basitarsus. D. S. (H.) gorirossiae claw. E. S. (H.) larvispinosum claw. F–G. S. (H.) juarezi, scutum with varying lighting. H–I. S. (H.) microbranchium, scutum with varying lighting. Figures A and C, D and E, and F–I, with same respective scaling.

FIGURE 3. A–G Male. A. S. (H.) juarezi, scutum. B. S. (H.) capricorne hind basitarsus; C–E. S. (H.) delatorrei, C. basistylus and dististylus, D. ventral plate, E. endoparameres and median sclerite. F–G. S. (H.) larvispinosum F. basistylus and dististylus, G. ventral plate. H–I. pupa, frontoclypeus of S. (H.) capricorne and S. (H.) delatorrei respectively. (C, H) and (D, E) same scale respectively.

FIGURE 5. Pupa and respiratory organ. A, B. S. (H.) burchi; A. lateral view, B. dorsal view. C–F. S. (H.) delatorrei; D. in laterodorsal view; E. dorsal view, F. laterointernal view. G–I. S. (H.) estevezi, H. dorsal view, I. ventral view. J–M. S. (H.) dalmati, J. lateral view, K. dorsal view, L. frontal view. M. ventral view. N–O. S. (H.) juarezi, N. lateral view, O. dorsal view. (A, B–E, G–O same scale).