Studies on Procamallanus (Spirocamallanus) pereirai Annereaux, 1946 (Nematoda : Camallanidae), with new host records and new morphological data on the larval stages

Larval stages and adults of Procamallanus (Spirocamallanus) pereirai Annere aux, 1946 are described from naturally infected Paralonchurus brasiliensis (Steindachner) (Sciaenidae) from the coast of the State of Rio de Janeiro, Brazil. The translucent first-stage larvae have a denticulate process at th e anterior end, no buccal capsule or esophagus undifferentiated into anteri or muscular and posterior glandular parts and an elongate tail; third-stage larvae have a tail with three terminal projections, a buccal capsule divid ed into an anterior portion with 12-20 ridges running to the left and a pos terior smooth portion, and an esophagus with muscular and glandular regions . Fourth-stage larvae exhibit a buccal capsule lacking a distinct basal rin g with ridges running to the right and a tail with two terminal processes, as in adults. New host records are reported and their role in its life-cycl e are discussed.