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Hydramoeba hydroxena (Entz), a Parasite on the Fresh‐water Medusa, Craspedacusta sowerbii Lankester, and its Pathogenicity for Hydra cauliculata Hyman
Author(s) -
RICE NOLAN E.
Publication year - 1960
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1960.tb00723.x
Subject(s) - lernaean hydra , biology , facultative , amoeba (genus) , fresh water , zoology , pathogenicity , parasite hosting , ecology , botany , microbiology and biotechnology , fishery , world wide web , computer science
SYNOPSIS. An amoeba found on the fresh‐water medusa, Craspedacusta sowerbii Lankester, collected in the Southampton Quarry Pond at Richmond, Virginia, is described and found to be identical with Hydramoeba hydroxena (Entz) which occurs on various species of fresh‐water hydras. Transfer of the amoeba to Hydra cauliculata Hyman, and other experiments, show it to be a facultative parasite for this species. The pathogenicity of the amoeba is decreased by fouling of the culture medium; the resistance of the hydra is decreased by starvation. Hydramoeba is also capable of destroying adult fresh‐water medusae in six days. Its relation to young medusae is not known, but the amoeba apparently does not attack the polyps or other developmental stages.