Ultrastructural and molecular characterization of Bacillidium vesiculoformis n. sp. (Microspora: Mrazekiidae) in the freshwater oligochaete Nais simplex (Oligochaeta: Naididae)

The development of a new species, Bacillidium vesiculoformis n. sp. (Microspora, Mrazekiidae), is described from the freshwater oligochaete Nais simplex (Oligochaeta, Naididae). Initial stages of parasite development consist of a monokaryotic merogony within a haemocyte of the intestinal blood sinus...

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Bibliographic Details
Published in:Parasitology 2005-01, Vol.130 (1), p.31-40
Main Authors: MORRIS, D. J., TERRY, R. S., FERGUSON, K. B., SMITH, J. E., ADAMS, A.
Format: Article
Language:English
Subjects:
Animals
Aquaculture
Aquariums
Archives & records
Bacillidium vesiculoformis
Biological and medical sciences
Bryozoa
Cytoplasm
Deoxyribonucleic acid
Developmental stages
Disease transmission
DNA
Fundamental and applied biological sciences. Psychology
General aspects
General aspects and techniques. Study of several systematic groups. Models
Host-Parasite Interactions
Infections
Intestine
Invertebrates
Janacekia debaiseuxi
life-cycle
manubrium
Microscopy
Microspora
Microsporidia - classification
Microsporidia - genetics
Microsporidia - ultrastructure
Molecular chains
Naididae
Nais simplex
New species
Oligochaeta
Oligochaeta - parasitology
Parasites
Phylogenetics
Phylogeny
Pseudonosema
Rupturing
Spores
Sporogenesis
Sporogony
Studies
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Description
Summary:The development of a new species, Bacillidium vesiculoformis n. sp. (Microspora, Mrazekiidae), is described from the freshwater oligochaete Nais simplex (Oligochaeta, Naididae). Initial stages of parasite development consist of a monokaryotic merogony within a haemocyte of the intestinal blood sinus. The resulting hypertrophied haemocyte is attached to the chloragocytes of the sinus by fine cytoplasmic extensions with the sinus around the cell becoming greatly enlarged. The meronts within the haemocyte form diplokaryotic sporonts that undergo sporogenesis directly within the cytoplasm of the host cell. The infected cell becomes packed with spores and developmental stages, causing it dramatically to increase in size, eventually rupturing the oligochaete and cell. Sporogony appears to be disporoblastic. Released spores were observed to have an adhesive quality. Transmission studies conducted with mature spores failed to transmit the parasite horizontally although vertical transmission was observed. Phylogenetic analysis of the parasite demonstrated that B. vesiculoformis clustered with microsporidian parasites of bryozoa and two other microsporidians, Janacekia debaiseuxi and an unidentified Bacillidium sp.
ISSN:0031-1820
1469-8161
DOI:10.1017/S0031182004006286