Molecular phylogeny by Bayesian analysis and description of a new species of Henneguya, a parasitic cnidarian from Astyanax bimaculatus (Linnaeus, 1758) (Characiformes: Acestrorhamphidae) in Caatinga: A biome with neglected biodiversity data
Maurício Jorge, Patrick Delgado Mathews, Diego Henrique Mirandola Dias Vieira, Reinaldo José da Silva
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引用次数: 0
Abstract
Myxozoans are cnidarian parasites with a worldwide distribution and represent some of the most spectacular examples of parasite radiation. Based on an integrative taxonomic approach that includes spore morphology and molecular data, as well as other phenotypic characters such as host specificity, a new myxozoan, Henneguya caraubensis n. sp., is described from the gills of Astyanax bimaculatus (Linnaeus, 1758). Plasmodia were located within the gill lamellar epithelium, without connective tissue surrounding them. Mature myxospores were ellipsoidal in the frontal view, measuring 27.2 ± 2.6 μm in total length, 10.3 ± 0.7 μm in body length of spore, and 3.9 ± 0.2 μm in width. Two polar capsules elongated pyriform in shape, equal in size, measuring 3.4 ± 0.3 μm in length and 1.2 ± 0.1 μm in width. Polar tubules had 5 to 6 coils. Histopathological analysis showed large intralamellar polysporic plasmodia associated with displacement, deformation, and fusion of the nearest gill lamellae and with the adjacent lamellae being pushed laterally. Bayesian inference SSU rDNA-based phylogenetic analyses showed a strong tendency of Henneguya/Myxobolus species to form clusters mainly based on the order and/or family of the host, despite having different geographic origins. Phylogenetically, the novel species grouped within a clade containing Henneguya/Myxobolus spp. and appears in a well-supported subclade of Henneguya species parasites of Astyanax fishes. Our study reinforces highly endemic diversity still hidden that inhabits the Caatinga biome and points out the need to improve the strategies of protection and conservation of this threatened ecoregion with neglected biodiversity data.
期刊介绍:
Parasitology International provides a medium for rapid, carefully reviewed publications in the field of human and animal parasitology. Original papers, rapid communications, and original case reports from all geographical areas and covering all parasitological disciplines, including structure, immunology, cell biology, biochemistry, molecular biology, and systematics, may be submitted. Reviews on recent developments are invited regularly, but suggestions in this respect are welcome. Letters to the Editor commenting on any aspect of the Journal are also welcome.