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Cited by 34Protist diversity and phylogenyAquaculture disease management and microbiotaParasite Biology and Host Interactions

The DOI matches its Crossref record.

Morphology of Diplomonad Flagellates: Spironucleus torosa N. Sp. from Atlantic Cod Gadus morhua L., and Haddock Melanogrammus aeglefinus (L.) and Hexamita salmonis Moore from Brook Trout Salvelinus fontinalis (Mitchill)

POYNTON, SARAH L., MORRISON, CAROL M.·1990·The Journal of Protozoology
DOI 10.1111/j.1550-7408.1990.tb01160.x
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Abstract

ABSTRACT. A diplomonad flagellate, Spironucleus torosa n. sp. is described from Atlantic Cod Gadus morhua and haddock Melanogrammus aeglefinus. This is believed to be the 1st confirmed report of Spironucleus from a marine fish. Organisms swimming in the rectal lumen were broadly pyriform to elongate, and measured 10.5–18.6 μm long and 3.2–13.3 μm wide; other elongate organisms were attached to the rectal epithelium, via apical extensions appearing continuous with the microvilli. The posterior end of the body was extended into a caudal projection, on either side of which was a posteriolateral ring‐shaped protrusion or torus, with a recurrent flagellum emerging from its centre. A symmetrical system of microtubules and lamellae, forming a “V” in protargol impregnated specimens, supported the flanges of the body surrounding the tori, the tori themselves and the caudal projection. Supranuclear microtubules were an inverted V to U shape in transverse section, and an electron dense band accompanied the cytostomes. Lightly staining homogenous cytoplasm was usually present in the anterior part of the body, the remainder being highly vacuolated with numerous dark granules. In swimming organisms, rough endoplasmic reticulum (RER) was present around the nuclei and cytostomes, and bacteria were occasionally seen in the cytoplasm. In “attached” organisms, RER was reduced, and bacteria were absent. Hexamita salmonis Moore from Salvelinus fontinalis was studied by light and scanning electron microscopy for comparison; its cytoplasm was not highly vacuolated. The two recurrent flagella emerged close together from the blunt posterior end of the body.

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  • In Spironucleus torosa, the corresponding area of the cell mediates intimate contact with the epithelium of the host.

    “In the related flagellate Spironucleus torosa, which infects gadoid fish, this area of the cell has been seen to mediate intimate contact with the epithelium of the host (28).”

    From Comparative Cell Biology and Evolution of Annexins in Diplomonads (2016) · cites this paper as [28]

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Research works printed but not linked: 38

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Metadata

Authors
POYNTON, S. L., & MORRISON, C. M.
Affiliations
Fisheries and Oceans Canada (CA)
ORCID
POYNTON, SARAH L.
Venue
The Journal of Protozoology
Publisher
Wiley
Published
1990-09
Volume
37
Issue
5
Pages
369-383
ISSN
0022-3921 (ISSN-L)
DOI
10.1111/j.1550-7408.1990.tb01160.x
OpenAlex
W1977625703
Cited by
34
References
0
Citations by year
2026: 1 · 2022: 1 · 2020: 1 · 2018: 1 · 2016: 3 · 2013: 1 · 2012: 1
FWCI
0.57
Type
journal article
Language
en
Open access
closed
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 6086 d)
Locations
  • The Journal of Protozoology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Protist diversity and phylogeny
  • Life Sciences › Immunology and Microbiology › Immunology › Aquaculture disease management and microbiota
  • Life Sciences › Immunology and Microbiology › Parasitology › Parasite Biology and Host Interactions
Keywords
new species description, flagellate morphology, marine fish parasites, Gadus morhua, haddock, salmon, brook trout, microtubules, cytostome, rough endoplasmic reticulum, bacterial association
MeSH terms
Animals, Fishes, Trout, Eukaryota

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