Ultrastructural description of Agarella gracilis Dunkerly, 1915 (Myxozoa, Chloromyxidae) parasite of the dipnoan Lepidosiren paradoxa from the River Amazon

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Pedro Vita (Autor) ICBAS; Laura Corral (Autor) ICBAS; Edilson Matos (Autor) Outra; Carlos Azevedo (Autor) ICBAS

Revista

Título: European Journal of Protistology

Vol. 40 Nº 3

Páginas: 213-218

ISSN: 0932-4739

Editora: Elsevier

Classificação Científica

FOS: Ciências exactas e naturais > Ciências biológicas

Outras Informações

DOI: 10.1016/j.ejop.2004.03.001

Abstract (EN): The myxosporean, Agarella gracilis, a parasite in Lepidosiren paradoxa collected in the estuarine region of the River Amazon, is described using light and transmission electron microscopy. The most evident life cycle stages were the spores, found in both the testis and ovary, which appeared scantily dispersed in the lumina. The prevalence of infection was 10/30 (33.3%). In mean dimensions the mature spore was 59.7μm in total length, composed of an elongated body 17.7μm long, 6.6μm wide and 5.9μm thick, with two long slightly divergent tail-like projections of the valves. There were four pyriform polar capsules, two longer (7.0×2.4μm) and two shorter (3.8×2.4μm), located anteriorly in the spore body; the polar filaments of all capsules had 6–7 turns. There was a posterior binucleate sporoplasm. The morphology agrees with the original description by light microscopy, and the taxonomy of the genus is discussed. The presence of the same genus of myxosporean parasites in both dipnoan and anuran species perhaps reflects their close phylogenetic relationship.

Idioma: Português

Tipo (Avaliação Docente): Científica