A new Myxobolus (Cnidaria: Myxosporea) infecting the ornamental catfish Corydoras schwartzi from the Purus River in Brazil

Author(s)

Mathews, Patrick D. ^{[1, 2]} ; Madrid, Rafael R. M. ^[2] ; Mertins, Omar ^[2] ; Rigoni, Vera L. S. ^[2] ; Morandini, Andre C. ^{[1, 3]}

Affiliation

^[1] Univ Sao Paulo, Inst Biosci, Dept Zool, BR-05508090 Sao Paulo - Brazil

^[2] Univ Fed Sao Paulo, Paulista Med Sch, Dept Biophys, BR-04023062 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Marine Biol Ctr CEBIMar, BR-11600000 Sao Sebastiao - Brazil

• Document type: Journal article
• Source: EUROPEAN JOURNAL OF TAXONOMY; v. 620, p. 1-14, MAR 30 2020.
• Web of Science Citations: 1

Abstract

A new microscopic cnidarian is described, infecting five of thirty (16.6%) specimens of Corydoras schwartzi caught in the Purus River, State of Amazonas, Brazil. Histological analysis showed that cyst development occurred in the serosa layer of the intestine. Mature myxospores are ovoid in body shape in frontal view, 22.4 +/- 0.3 mu m in total length and 16.3 +/- 0.1 mu m in width. Internally, two aubergine-shaped, elongate symmetrical polar capsules occupy more than half the length of the spore, 14.3 +/- 0.2 mu m in length and 6.5 +/- 0.1 mu m in width. Ultrastructural analysis provided evidence of five polar filament coils inside the polar capsule and binucleated sporoplasm containing a moderate number of sporoplasmosomes. The valvogenic cells abutting each other form a sutural ridge and frequently a thin layer of homogeneous material separates the cells. The outer surface of the myxospore valves is smooth, with no evidence of formation of ridges in the valves. Immature myxospores in various stages of development were observed. This study is the first report of a myxosporean parasitizing C. schwartzi and the first report of a myxosporean infection in the intestine of an ornamental fish from South America. (AU)

• FAPESP's process: 18/20482-3 - Diversity of microscopic cnidarians from the Amazon Basin with emphasis on phylogeny, systematic and interaction with their hosts
• Grantee: Patrick Mathews Delgado
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 16/13368-4 - Nanostructured systems: from membrane biomimetic models to carriers of bioactives
• Grantee: Karin Do Amaral Riske
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 15/23948-5 - Improvement of the polysaccharide chitosan properties for its application in liposomes and giant vesicles
• Grantee: Omar Mertins
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/21007-9 - Recognizing the diversity of jellyfishes (Medusozoa, Rhopaliophora)
• Grantee: André Carrara Morandini
• Support Opportunities: Regular Research Grants