Morphological and ultrastructural aspects of Myxobolus niger n. sp (Myxozoa) gill parasite of Corydoras melini (Siluriformes: Callichthyidae) from Brazilian Amazon

Author(s)

Mathews, Patrick D. ^[1] ; Maia, Antonio A. M. ^[2] ; Adriano, Edson A. ^{[1, 3]}

Affiliation

^[1] Univ Estadual Campinas, Inst Biol, Dept Biol Anim, Ave Bertrand Russel S-N, Caixa Postal 6109, BR-13083970 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Dept Med Vet, Fac Zootecnia & Engn Alimentos, Rua Duque de Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Fed Sao Paulo, Dept Ciencias Biol, Rua Prof Arthur Riedel 275, BR-09972270 Diadema, SP - Brazil

• Document type: Journal article
• Source: Acta Tropica; v. 158, p. 214-219, JUN 2016.
• Web of Science Citations: 8

Abstract

Myxobolus niger n. sp. (Myxozoa) is described in the connective tissue of the serosa layer of the gill arch of Corydoras melini (Callichthyidae) captured from the Negro River, Amazonas State, Brazil. The prevalence of the parasite was 20% and the range intensity was 1-2 cysts per fish. The plasmodia were white and spherical to ellipsoidal, measuring 175 mu m in diameter and were surrounded by a well-defined capsule of host connective tissue, with distinct delicate and interlaced collagen fibers. The myxospores body was ellipsoidal in frontal view and biconvex in sutural view. Spore dimensions were 11.3 +/- 0.4 mu m in length, 6.8 +/- 0.2 mu m in width and 4.1 +/- 0.2 mu m in thickness. The valves were symmetrical and smooth. The two polar capsules were elongated as pyriform and equal in size, measure 5.0 +/- 0.3 mu m in length and 2.0 +/- 0.1 mu m in width. The polar capsule had six to seven polar filament turns. Some aberrant spores were round in shape and had three polar capsules. The sporoplasm was binucleated and contained moderated number of sporoplasmosomes. The development of the plasmodia was asynchronic, with mature and immature spores. The plasmodium had moderated pynocitic channels. There were no projections, no invaginations and no microvilli in the plasmodial wall. This study is the first description of Myxobolus species in the fish of the Callichthyidae family. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/14656-5 - Systematics and host-parasite interaction of myxosporean parasites of ornamental fish from the Amazon Basin
• Grantee: Patrick Mathews Delgado
• Support Opportunities: Scholarships in Brazil - Doctorate
• 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