Allintoshius bioccai n. sp. (Nematoda), a parasite of the bat Eptesicus furinalis from Paraguay, and new data on A. parallintoshius (Araujo, 1940).

A new species of parasitic nematode (Nematoda: Trichostrongylina, Heligmosomoidea) Allintoshius bioccai n. sp., found in the small intestine of the vespertilionid bat Eptesicus furinalis from Paraguay, is described. The new species can be differentiated from A. urumiac (Freitas and Mendonça, 1960) by the absence of vulvar spines in females, and from A. nudicaudus (Freitas and Mendonça, 1963) by the shape of the spicules and the dorsal ray of the copulatory bursa. New data on the morphology and distribution of Allintoshius parallintoshius (Araujo, 1940) are also reported. E. furinalis, Myotis albescens and M. riparius are recorded as new hosts for this species. A key for the identification of the species belonging to the genus Allintoshius is also given.

Chimaerula bonai sp. n. (Cestoda: Dilepididae) from the bare-faced ibis, Phimosus infuscatus (Lichtenstein) (Aves: Threskiornithidae) in Paraguay.

Chimaerula bonai sp. n. is described from the small intestine of Phimosus infuscatus (Lichtenstein) in Paraguay. The new species differs from the other two species of Chimaerula Bona, 1994, i.e., Chinmaerula woodlandi (Prudhoe, 1960) and Chinmaerula leonovi (Belogurov et Zueva, 1968), mainly by the intermediate number of rostellar hooks (30-34 compared to 42-46 in the former and 20-22 in the latter), longer rostellar hooks (31-34 microm versus 26 microm and 19-21 microm, respectively), shorter cirrus sac (58-82 microm versus 158-201 microm and 134-183 microm, respectively) and the absence of rosethorn spines in the cirrus armament. Modifications in the generic diagnosis of Chimaerula are proposed in order to conform it with some peculiarities of the new species (i.e., the relatively small and thin cirrus, the absence of rosethorn spines in its armament and the small cirrus sac).

[Euzetiella tetraphylliformis n. gen., n. sp., (Eucestoda: Proteocephalidae), parasite of the neotropical sweat-water fish Paulicea luetkeni (Siluriforme, Pimelodidae)]. / Euzetiella tetraphylliformis n. gen., n. sp., (Eucestoda: Proteocephalidae), parasite du poisson d'eau douce néotropical Paulicea luetkeni (Siluriforme, Pimelodidae).

Description of a new genus and new species of proteocephalid tapeworm in Paulicea luetkeni, which shows superficial resemblance to tetraphyllids, especially in its gravid proglottides. Euzetiella tetraphylliformis belongs to the Proteocephalidae, Proteocephalinae due to the presence of medullary gonads as well as the shape of the scolex and the presence of uniloculate suckers. Furthermore, this species is characterized by an apolytic strobila, which represents an exception within the Proteocephalidea.

Polystoma cuvieri n. sp. (Monogenea: Polystomatidae), a parasite of the urinary bladder of the leptodactylid frog Physalaemus cuvieri in Paraguay.

A new species of polystomatid monogenean, Polystoma cuvieri, is described from the urinary bladder of the leptodactylid frog Physalaemus cuvieri Fitzinger in Paraguay. This new species possesses a reticulated intestine and hamuli of about 350 microns long. The closest species is Polystoma napoensis Vaucher, 1987, described from Osteocephalus spp. in Ecuador. The Paraguayan material is distinguished by the blade size of the hamuli. The hamuli blades appear to be useful in Polystoma systematics.