ABSTRACT
Objective was the relationship of the parasite Rhadinorhynchus plagioscionis with its host Plagioscion squamosissimus, providing morphological and morphometric data to prove the specificity of this parasite with its host, with reports occurring only in rivers in the Brazilian Amazon. Rhadinorhynchus plagioscionis infected P. squamosissimus captured in the municipal region of Santarém, in the state of Pará, in the eastern Brazilian Amazon. The specimens were analyzed by light and scanning electron microscopy. Morphological data obtained confirmed conspecificty with R. plagioscionis and supplemental information was added to the morphological concept of this species. The body of R. plagioscionis is cylindrical and milky-coloured with dorsal curvature, a long proboscis displaying ventral curvature with 12 longitudinal rows containing 22 to 24 hooks, which are larger and more prominent towards the end of the ventral curvature, and decrease in size in the posterior extremity of the proboscis. The present study describes, in addition to the morphological and morphometric characteristics of R. plagioscionis, which have host specificity for P. squamosissimus, a relationship being reported exclusively in the Brazilian Amazon.
Subject(s)
Acanthocephala , Fish Diseases , Parasites , Perciformes , Animals , Brazil/epidemiology , Fish Diseases/epidemiology , Fish Diseases/parasitology , Perciformes/parasitologyABSTRACT
PURPOSE: The present study aims to record the occurrence of a haemogregarine of the genus Dactylosoma in anurans in the eastern Brazilian Amazon. METHODS: Specimens of Leptodactylus macrosternum, Rhinella major, and Rhinella marina were collected in the municipality of Santarém, west of the State of Pará, in Brazil. Parasitic forms identified as Dactylosoma sp. were recorded by light microscopy, with magnification of 400 and 1000 X. RESULTS: Aspects about the morphology and morphometry of Dactylosoma sp. are presented. The mean intensity of infection was 200,000 parasites/mL in R. major and 50,000 parasites/mL in R. marina. CONCLUSION: The present study expands the occurrence of parasites of the genus Dactylosoma in Brazil, presenting a new anuran host for this parasite in the Brazilian Amazon region.
Subject(s)
Eucoccidiida , Parasites , Animals , Brazil , BufonidaeABSTRACT
Morphnus guianensis is a species belonging to the Accipitridae family classified as almost threatened by the International Union for Conservation of Nature (IUCN). Trypanosomes are flagellated protozoa that carry out their life cycle in the circulatory system of vertebrate hosts and within the digestive tract of invertebrate hosts. This study recorded Trypanosoma sp. parasitizing M. guianensis in the Brazilian Amazon, providing data related to the morphology and morphometry of the trypomastigote forms of peripheral blood of this bird. The mean values of the measured morphological regions were used to compare morphometric similarity with morphotypes described for Trypanosoma sp. through the Bray-Curtis method and, after statistical analysis, the dendrogram was generated from the morphological similarities with a similarity greater than 95% with T. paddae described for different hosts in different geographical regions.
