Volume 33, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



In four localities of Guatemala with dissimilar intensities of onchocerciasis, filarial larvae were recovered by dissection from host-seeking . Measurements made on over 600 larvae were used to characterize the early first, late first, second, and third developmental stages. The numerical attributes used to characterize the third larval stage and the associated means were body length (657.3 µm); anterior body width (18.9 µm); posterior body width (20.2 µm); distance from anterior end to nerve ring (87.9 µm), to junction of muscular and glandular esophagus (137.6 µm), and to junction of esophagus and intestine (419.6 µm); and distance from anus to tip of tail (36.8 µm). Ratios to total body length were as follows: distance from anterior end to nerve ring, = 0.133, to junction of esophagus and intestine, = 0.634, and to anus, = 0.945. Differences between these phenotypic features and those reported for African appeared to be insufficient to distinguish the two forms. With very few exceptions, the filarial larvae found in host-seeking were considered to be .


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