Morphological studies on the larval stages of three species of Setaria and Dirofilaria repens
Li, Z.X.; Yu, L.R.
Southeast Asian Journal of Tropical Medicine and Public Health 21(1): 95-102
1990
ISSN/ISBN: 0125-1562 PMID: 1976274 Document Number: 355932
This paper reports for the first time the morphology of larval stages of Setaria labiato papillosa. The infective larvae of this species has 2 circles of small papillae on the cephalic end, 4 papillae in the outer circle and 6 in the inner circle. The caudal end of S. labiato papillosa is digital with 3 transversely arranged papillae. There are 2 circles of small papillae on the cephalic end of S. leichungwingi and S. equina, 4 for each circle; the caudal terminal of the former species is willow-shaped with 3 pearl-like papillae, and that of the latter is conical shaped with one bulbed papilla, and 2 slightly protruded sub-terminal papillae. The anal ratios of all the above 3 species are <3. Morphology of larval stages of Dirofilaria repens is also described. The 3 bulbed caudal papillae of the infective larvae are closely arranged, and the anal ratio is <2. A key to infective larvae of 8 species of filaria (including Wuchereria bancrofti, Brugia malayi, D. repens and S. digitata) is given.