Novel myxosporean species parasitizing an economically important fish from the Amazon basin

Author(s)

Capodifoglio, Kassia R. H. ^[1] ; Adriano, Edson A. ^{[2, 3]} ; Naldoni, Juliana ^[3] ; Meira, Caroline M. ^[1] ; da Silva, Marcia R. M. ^[1] ; Maia, Antonio A. M. ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Vet Med, Pirassununga, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Biol, Dept Anim Biol, Campinas, SP - Brazil

^[3] Fed Univ Sao Paulo UNIFESP, Dept Ecol & Evolutionary Biol, Diadema, SP - Brazil

• Document type: Journal article
• Source: Parasitology Research; v. 119, n. 4 MAR 2020.
• Web of Science Citations: 1

Abstract

This paper provides morphological and phylogenetic analyses of two new myxobolid species found infecting Piaractus brachypomus from the Amazon basin. The fish were caught in the Tapajos River, in the municipality of Santarem, in the state of Para, Brazil. The plasmodial development of Henneguya brachypomus n. sp. occurred in the gill lamellae while Myxobolus pirapitingae n. sp. developed in the pyloric cecum. Morphological analyses did not identify inflammatory infiltrate for either species, but H. brachypomus n. sp. induced stretching of the epithelium, compression of the adjacent tissues, and displacement and deformation of the neighboring lamellae. The mature myxospores of H. brachypomus n. sp. were ellipsoid, with a length of 11.7-13.8 mu m, a width of 4.0-4.6 mu m, and a thickness of 3.5 \& x2d7;4.3 mu m. The polar capsules were elongated, with a length of 5.6-7.3 mu m and a width of 1.3-2.0 mu m, and each contained a polar filament with 8-9 coils. The caudal process was 40.5-48.1 mu m long and the total length of the myxospore was 52.4-61.6 mu m. Myxobolus pirapitingae n. sp. exhibited rounded mature myxospores measuring 10.0-11.1 mu m in length, 7.0-7.6 mu m in width, and 5.4-6.3 mu m in thickness. The polar capsules were of equal size and occupied less than half the myxospore, measuring 3.5-4.0 mu m in length and 2.0-2.6 mu m in width, with each containing a polar filament with 6-7 coils. Phylogenetic analysis based on partial small subunit ribosomal DNA (ssrDNA) sequences showed that H. brachypomus n. sp. clustered as a sister species of Henneguya piaractus, while M. pirapitingae n. sp. was grouped in a sub-clade together with Myxobolus matosi and Myxobolus colossomatis. (AU)

• FAPESP's process: 16/22047-7 - Myxosporean parasites of commercially important Perciformes fish (Cichlaspp. and Plagioscion spp.) in the Amazon Basin
• Grantee: Edson Aparecido Adriano
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/22700-7 - Systematic and host-parasite relationship of myxosporean parasites of Pimelodidae family fish in the Amazon Basin
• Grantee: Juliana Naldoni
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/21374-6 - Systematics and host-parasite interaction of parasites of the phylum Myxozoa in fishes economically important in Amazon Basin
• Grantee: Edson Aparecido Adriano
• Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants
• FAPESP's process: 15/07713-8 - Systematic and genetic characterization of myxosporean populations parasites in Colossoma macropomum and Piaractus brachypomus in the Amazon Basin
• Grantee: Kassia Roberta Hygino Capodifoglio
• Support Opportunities: Scholarships in Brazil - Doctorate