Amazonian waters harbour an ancient freshwater Ceratomyxa lineage (Cnidaria: Myxosporea)

Amazonian waters harbour an ancient freshwater Ceratomyxa lineage (Cnidaria: Myxosporea)

Author Zatti, Suellen A. Google Scholar
Atkinson, Stephen D. Google Scholar
Bartholomew, Jerri L. Google Scholar
Maia, Antonio A. M. Google Scholar
Adriano, Edson A. Autor UNIFESP Google Scholar
Abstract A new species of Ceratomyxa parasitizing the gall bladder of Cichla monoculus, an endemic cichlid fish from the Amazon basin in Brazil, is described using morphological and molecular data. In the bile, both immature and mature myxospores were found floating freely or inside elongated plasmodia: length 304 (196-402) mu m and width 35.7 (18.3-55.1) mu m. Mature spores were elongated and only slightly crescent-shaped in frontal view with a prominent sutural line between two valve cells, which had rounded ends. Measurements of formalin-fixed myxospores: length 6.3 +/- 0.6 (5.1-7.5) mu m, thickness 41.2 +/- 2.9 (37.1-47.6) mu m, posterior angle 147 degrees. Lateral projections slightly asymmetric, with lengths 19.3 +/- 1.4 mu m and 20.5 +/- 1.3 mu m. Two ovoid, equal size polar capsules, length 2.6 +/- 0.3 (2-3.3) mu m, width 2.5 +/- 0.4 (1.8-3.7) mu m, located adjacent to the suture and containing polar filaments with 3-4 turns. The small subunit ribosomal DNA sequence of 1605 nt was no more than 97% similar to any other sequence in GenBank, and together with the host, locality and morphometric data, supports diagnosis of the parasite as a new species, Ceratomyxa brasiliensis n. sp. Maximum parsimony and maximum likelihood analyses showed that C brasiliensis n. sp. clustered within the marine Ceratomyxa Glade, but was in a basally divergent lineage with two other freshwater species from the Amazon basin. Our results are consistent with previous studies that show Ceratomyxa species can cluster according to both geography and host ecotype, and that the few known freshwater species diverged from marine cousins relatively early in evolution of the genus, possibly driven by marine incursions into riverine environments. (C) 2017 Elsevier B.V. All rights reserved.
Keywords Myxozoa
ssrDNA sequencing
Freshwater environment
xmlui.dri2xhtml.METS-1.0.item-coverage Amsterdam
Language English
Sponsor CAPES Foundation within the Ministry of Education, Brazil [BEX - 6729/2015-00]
Sao Paulo Research Foundation - FAPESP [2013/21374-6]
Brazilian Fostering Agency CNPq [305630/2013-0]
Date 2017
Published in Acta Tropica. Amsterdam, v. 169, p. 100-106, 2017.
ISSN 0001-706X (Sherpa/Romeo, impact factor)
Publisher Elsevier Science Bv
Extent 100-106
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000396954000013

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