Simulium ( Hearlea ) temascalense Díaz Nájera & Vulcano

Simulium ( Hearlea) temascalense Díaz Nájera & Vulcano View in CoL

Fig. 9J View FIGURE 9 .

Simulium ( Hearlea) temascalense Díaz Nájera & Vulcano, 1962: 102–105 View in CoL , 140, 142, Figs. 89–105.

(Diagnosis of female, and pupa derived from Díaz Nájera & Vulcano, 1962).

Female: General coloration blackish. Scutum brown with 1+1 thin silvery vittae not adjoining anterior 1+1 subtriangular silvery spots. Pleurae black pollinose. Femora and tibiae yellowish, with black apices. Meso­ and metathoracic coxae, trochanter, tarsomeres I–II, and apex of tarsomere III black. Cibarium with smooth, thickened, medially concave anterior margin. Genitalia as in S. larvispinosum .

Male: unknown.

Pupa: Cocoon (at base), 3 mm. Frontoclypeus and anterodorsum of thorax without platelets. Gill with general facies of S. carolinae , with dorsal branch elongate, relatively thin, with accuminate, spinulate apex, and seven small subbasal branches and a more distal one that is curved and directed posteroventrally; apex of branches spinulate.

Larva: Length (mature), 8 mm. Coloration dark greenish; head yellowish, cephalic apotome without noticeable headspots. Labral fan with 50 primary rays. Mandible with strong preapical tooth, two rows of internal teeth, and 2 large marginal teeth; lateromandibular process long and curved. Ratio of antennal articles = 1:1.6:1.2 (proximal: medial: distal). Comb of thoracic proleg sclerite with 38–39 teeth arranged in 10 groups. Hypostoma with anterior margin curved, median tooth longer than other teeth, and 15 lateral setae per side; ratio of hypostoma/hypostomal bridge = 0.8; postgenal cleft mildly curved apically, without accuminate anteromedian incision. Sternite VIII with 1+1 sublateral, sclerotized papillae. Posterior circlet with 242 rows of 26–30 hooks. Posterior portion of abdomen with 2+2 dorsolateral accuminate posteriorly directed processes, 1+1 wide ventrolateral positioned processes having small lateral projections ( Fig. 9J View FIGURE 9 [dd and vl]); 1+1 dorsolateral flattened plates and 1+1 ventrolateral papillae; ventral struts of anal sclerite encircling posterior circlet. Rectal papillae trilobed, with 7–9 lobules per lobe (21–27 total).

Material examined: México, Oaxaca, San Felipe del Agua , 1 larva, October 1948, Cordova ( MLP) leg. INDRE .

Distribution: México: Michoacan, Oaxaca

Discussion: Simulium johnsoni and S. larvispinosum have very similar pupal gills, but their larvae lack ventrolateral papillae on segment VIII and their females have a darker scutum.