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Light and ultrastructural observations on a microsporidium in the hydrozoan Halammohydra intermedia (Cnidaria)

Abstract A microsporidium has been observed in the interstitial hydrozoan Halammohydra intermedia Clausen, 1967. The ultrastructure of the spores has been studied. The oval spores (c. 1.7 × 1.0 εm in unfixed smear preparations) have an isofilar polar tube deposed in four to six coils in one or two layers beneath the spore wall. There appears to be octosporoblastic sporogny; however, the precise systematic position is uncertain, as presporal development and nuclear conditions are unrevealed. This is the second report of a microsporidium in the Cnidaria, and the first in a marine cnidarian.