PROCAMALLANUS (DENTICAMALLANUS SUBGEN. N.) DENTATUS N. SP. (NEMATODA,CAMALLANIDAE) FROM THE CHARACID FISH, BRYCONOPS-ALBURNOIDES, IN THE BRAZILIAN AMAZON

A new camollanid nematode, Procamallanus dentatus sp described from th e intestine of the characid fish, Bryconops alburnoides Kner, 1859 fro m the Uburu River, Amazonas State, Brazil. The parasite is characteriz ed mainly by the structure of the buccal capsule. four to five spiral thickenings are present in the buccal capsule of females, while about 10 large, anteriorly directed and sharply pointed teeth are present in thai of the males. This feature is used for creating a new subgenus, Denticomallanus subgen. n., with the type species P. (D.) dentatus sp, n. Other features characteristic of this species are the presence of very short (0.078-0.117 mm) spicules of equal length, 2 pairs of prean al and 3 pairs of postanal papillae and the absence of caudal alae in the male. The rail of the female is short and wide, with a small conic al appendage. The ratio of the muscular and the glandular parts of the oesophagus is 1:1.5-1.7. A key to subgenera of the genus Procamallanu s Baylis, 1923 is provided.