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Mermithid nematodes cause morphological and sexual anomalies in the pupae and adults of Stictochironomus polystictus (Kieffer). The parasite-induced changes resulted in the development of three types of intersexes. Structural alterations of adult males were variation of antennal length, appearance of antenna and number of flagellomeres, VIIIth abdominal segment, genitalia and associated appendages...
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