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Abstract We describe here aspects of the anatomy of two "Epulopiscium" morphotypes, unusually large bacte-
 

Summary: Abstract We describe here aspects of the anatomy of
two "Epulopiscium" morphotypes, unusually large bacte-
ria that are not yet cultured and that reproduce by the in-
ternal generation of two or more vegetative daughter cells.
Two morphotypes, A and B, which are enteric symbionts
of several species of herbivorous surgeonfish (Acanthuri-
dae), were collected around the Great Barrier Reef of
Australia, preserved there, and later stained for light mi-
croscopy. Some samples were examined by electron mi-
croscopy. In both morphotypes, countless discrete nucleo-
plasms or nucleoids were found to occupy a single shal-
low layer just beneath the surface all around these organ-
isms. At each end of the morphotype B cells, a membrane-
bound compartment containing dense cords of chromatin
was observed. When these were found at each end of
growing daughter cells, no polar compartments were then
found in their mother organism. Electron micrographs of
sections of morphotype A symbionts show that their out-
ermost region is composed of tightly packed coated vesi-
cles, each surrounded by a thin, dense, spacious capsule.

  

Source: Angert, Esther - Department of Microbiology, Cornell University

 

Collections: Biology and Medicine