Mediorhynchus papillosus

COMMENTS: The morphology of the proboscis, with cuticular folds, a proboscis armature of 24 rows of 4 - 5 hooks and 30 - 34 rows of 4 spines, largest hooks 30, is consistent with that of M. papillosus (see Amin & Dailey, 1998). When compared with the populations of M. papillosus noted by Amin & Dailey (1989) measurements of all except the lemnisci fall within the variability listed. The lemnisci of the Paraguayan male are longer than the trunk, as has been previously described only for juvenile males, but this difference is congruent with the morphological variability found in different populations of M. papillosus (Amin & Dailey, 1989). In South America M. papillosus was known only from the cosmopolitan sparrow, P. domesticus from Brazil. The geographical distribution is now extended to Paraguay and the host range to include T. amaurochalinus.

MATERIAL EXAMINED: MHNG-INVE- 38420, 1 male, 1 female, pieces of worm, small intestine, Turdus amaurochalinus, Cabanis, 1850 (Turdidae), Paraguay, Pozo Arias, 11.08.1996. – MHNG-INVE- 38407, 1 juvenile female, small intestine, Turdus amaurochalinus, Cabanis, 1850, Paraguay, Arroyo Trementina, 12.10.1991. – MHNG-INVE- 38454, 1 female, small intestine, Turdus amaurochalinus, Cabanis, 1850, Paraguay, Pedro P Pena, 8.10.1986.