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Description of Myxidium commersoni (Myxosporea): A New Species from the Gallbladder of White Sucker in Nova Scotia
Author(s) -
Cone D. K.,
Grinham T.,
Odense P. H.
Publication year - 1992
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1992)004<0271:domcma>2.3.co;2
Subject(s) - myxosporea , polar filament , catostomus , biology , anatomy , nova scotia , devonian , paleontology , spore , geology , microsporidia , fishery , fish <actinopterygii> , oceanography
Myxidium commersoni (species nova) is described from the gallbladder of white sucker Catostomus commersoni in Nova Scotia. The ovoid to rectangular plasmodium is relatively large (up to 2.5 mm long) compared with that of other described species, and it is only loosely associated with the gallbladder wall. Fixed specimens have a concave surface with anastomosing microvillar projections and a convex surface thrown into ridges that form a honeycomb pattern. The ectoplasm is composed of an outer zone of fine vesicles and an inner zone of sunken nuclei that are surrounded by vesicular mitochondria and endoplasmic reticulum. The endoplasm contains developing spores in a loose network of fine ectoplasmic extensions. Spores are ellipsoidal with rounded or bluntly pointed ends in front view, and they are moderately S‐shaped in side view. Spores measure 10–12 μm long, 5.5–7 μm wide, and 5.0–5.5 μm thick, and each has 7–12 longitudinal striations. Each polar capsule is 2–4 μm long, and the polar filament has six or seven coils. Myxidium commersoni is the fourth species of its genus to be described from catostomid fishes.