Evaluation of the synlophe of Nematodirus urichi and N. lamae (Trichostrongyloidea) from Mazama americana and camelids (Artiodactyla) in the Neotropics

Abstract

The synlophes of male and female specimens of Nematodirus urichi and male specimens of Nematodirus lamae are characterized. In the cervical region, at the level of the cervical papillae there were 34 and 42 ridges of variable height in male and female N. urichi, respectively. Ten (male) and 14 (female) ridges extend to the base of the cephalic expansion. In males there are 33 ridges at midbody with the synlophe extending posteriad to within 100 μm of the prebursal papillae. In females there are 38 or 39 ridges at midbody, the synlophe terminating at the level of the vulva. For N. lamae, there were 38–42 ridges in the cervical region; 14 extend to the base of the cephalic expansion. There are 36 ridges at midbody, the synlophe extending posteriad to within 100 μm of the prebursal papillae. An evaluation of parasite morphology and host–parasite biogeography may indicate a close relationship between N. urichi and N. lamae.