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Biol Bull 68: 51-68. (February 1935)
© 1935 Marine Biological Laboratory
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TAXONOMIC AND CYTOLOGICAL STUDIES ON THE CILIATES ASSOCIATED WITH THE AMPHIPOD FAMILY ORCHESTIIDÆ FROM THE WOODS HOLE DISTRICT

I. THE STOMATOUS HOLOTRICHOUS ECTOCOMMENSALS

GEORGE W. KIDDER 1 and FRANCIS M. SUMMERS 1

1 From the Marine Biological Laboratory, Woods Hole, Massachusetts

1. Three species of the amphipod family Orchestiidæ were investigated for ectocommensals. These forms are Talorchestia longicornis (Say), Orchestia agilis Smith, and Orchestia palustris Smith. The material was collected in the vicinity of Woods Hole, Massachusetts.

2. The stomatous, holotrichous ciliates that live as ectocommensals on the amphipods studied belong to two genera: Allosphoeligrium gen nov., of which there are five species, and Chilodonella Strand, of which there are three new species.

3. All species of ciliates are well adapted to their environment, being small and flat and possessing ventrally placed thigmotactic cilia.

4. The binary fission of one species (Allosphoeligrium convexa gen. nov., sp. nov.) is described. A ball of chomatin is differentiated in the macronucleus and extruded into the cytoplasm just prior to cell fission. Most of the macronuclear chromatin takes the form of long chromosome-like bodies during division, duplicating to a fair degree the condition found in Myxophyllum.






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Copyright © 1935 by the Marine Biological Laboratory.