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    Morphological studies on the larval stages of three species of Setaria and Dirofilaria repens.

    Source

    Department of Epidemiology, Chinese Academy of Preventive Medicine, Shanghai.

    Abstract

    This paper reports for the first time the morphology of larval stages of Setaria labiato-papillosa. The infective larvae of this species had two circles of small papillae on the cephalic end, 4 papillae for outer circle and 6 for inner circle. The caudal end of S. labiato-papillosa is in digital form with 3 transversally 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 1 bulbed papilla, 2 slightly protruded papillae at sub-terminal. The anal ratios of all the above 3 species are below 3. Morphology of larval stages of Dirofilaria repens was also primarily described in China. The 3 bulbed caudal papillae of the infective larvae are closely arranged, and the anal ratio being less than 2. A key to infective larvae of 8 species of filaria was worked out according to relevant literature and the present study.

    PMID:
    1976274
    [PubMed - indexed for MEDLINE]

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