Phylogenetic position and ultrastructure of two Dermocystidium species (Ichthyosporea) from the common perch (Perca fluviatilis)

Pekkarinen, Marketta, Lom, Jiri, Murphy, Colleen A., Ragan, Mark A. and Dykova, Iva (2003) Phylogenetic position and ultrastructure of two Dermocystidium species (Ichthyosporea) from the common perch (Perca fluviatilis). Acta Protozoologica, 42 4: 287-307.

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Author Pekkarinen, Marketta
Lom, Jiri
Murphy, Colleen A.
Ragan, Mark A.
Dykova, Iva
Title Phylogenetic position and ultrastructure of two Dermocystidium species (Ichthyosporea) from the common perch (Perca fluviatilis)
Journal name Acta Protozoologica   Check publisher's open access policy
ISSN 0065-1583
Publication date 2003
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 42
Issue 4
Start page 287
End page 307
Total pages 21
Place of publication Warsaw, Poland
Publisher Polska Akademia Nauk
Collection year 2004
Language eng
Subject C1
270308 Microbial Systematics, Taxonomy and Phylogeny
780105 Biological sciences
Abstract Sequences of small-subunit rRNA genes were determined for Dermocystidium percae and a new Dermocystidium species established as D. fennicum sp. n. from perch in Finland. On the basis of alignment and phylogenetic analysis both species were placed in the Dermocystidium-Rhinosporidium clade within Ichthyosporea, D. fennicum as a specific sister taxon to D. salmonis, and D. percae in a clade different from D. fennicum. The ultrastructures of both species well agree with the characteristics approved within Ichthyosporea: walled spores produce uniflagellate zoospores lacking a collar or cortical alveoli. The two Dermocystidium species resemble Rhinosporidium seeberi (as described by light microscope), a member of the nearest relative genus, but differ in that in R. seeberi plasmodia have thousands of nuclei discernible, endospores are discharged through a pore in the wall of the sporangium, and zoospores have not been revealed. The plasmodial stages of both Dermocystidium species have a most unusual behaviour of nuclei, although we do not actually know how the nuclei transform during the development. Early stages have an ordinary nucleus with double, fenestrated envelope. In middle-aged plasmodia ordinary nuclei seem to be totally absent or are only seldom discernible until prior to sporogony, when rather numerous nuclei again reappear. Meanwhile single-membrane vacuoles with coarsely granular content, or complicated membranous systems were discernible. Ordinary nuclei may be re-formed within these vacuoles or systems. In D. percae small canaliculi and in D. fennicum minute vesicles may aid the nucleus-cytoplasm interchange of matter before formation of double-membrane-enveloped nuclei. Dermocystidium represents a unique case when a stage of the life cycle of an eukaryote lacks a typical nucleus.
Keyword Microbiology
Dermocystidium Percae
D. Fennicum Sp N.
Perca Fluviatilis
Phylogenetic Position
Flounder Limanda-ferruginea
Animal-fungal Divergence
Ribosomal-rna Gene
Nova-scotia Shelf
Protistan Parasites
Q-Index Code C1

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