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Pseudocrepidobothrium ludovici sp. n. (Eucestoda: Proteocephalidea), a parasite of Phractocephalus hemioliopterus (Pisces: Pimelodidae) from Brazilian Amazon. Pseudocrepidobothrium ludovici sp. n., is described from the intestine of the pimelodid fish, Phractocephalus hemioliopterus (Bloch and Schneider, 1801) (Pisces: Pimelodidae), from the Amazon River in Brazil. The new species differs from the only other known congeneric species Pseudocrepidobothrium eirasi (Rego & de Chambrier, 1995), by the absence of ventral lateral posterior appendix on each side of the proglottides. Furthermore, the new species differs from P. eirasi by several other morphological characters such as the number of testes (21-51, x = 32 versus 37-79, x = 55), the absence of polar structure in the eggs, the structure of the scolex and the disposition of vitelline follicles. Prevalence of infection with Pseudocrepidobothrium ludovici is 12/29 (41%) in Brazil. No P. ludovici was found in Peru into the MP. hemioliopterus studied. A total of 12228 proteocephalidean cestodes were found in a single host specimen: 10641 Pseudocrepidobothrium eirasi (Rego & de Chambrier, 1995) (87 % of counted tapeworms), 1100 ludovici sp. n. (9%), 383 Scholzia emarginata (Diesing, 1850), 84 Chambriella sp., 15 Proteocephalus hemioliopteri de Chambrier & Vaucher, 1997, 4 Zygobothrium megacephalum Diesing, 1850, and 1 Ephedrocephalus microcephalus Diesing, 1850. Pseudocrepidobothrium ludovici sp. n. represents the seventh proteocephalidean species found in Phractocephalus hemioliopterus.

revue suisse de zoologie

Pseudocrepidobothrium ludovici sp n. (Eucestoda: Proteocephalidea), a parasite of Phractocephalus hemioliopterus (Pisces: Pimelodidae) from Brazilian Amazon