Morphology and Distribution of the Acanthoecidae (Choanoflagellata) from the Weddell Sea during the Austral Summer, 1977

Eight species of loricate choanoflagellates (Acanthoecidae), Acanthoecopsis spiculifera, Bicosta spinifera, Bicosta antennigera, Calliacantha simplex, Calliacantha multispina aff., Crinolina aperta, Diaphanoeca multiannulata, and Parvicorbicula socialis, were observed in samples obtained from the We...

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Bibliographic Details
Main Author: Buck,Kurt
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1980
Subjects:
Microbiology
Biological Oceanography
*AQUATIC ORGANISMS
*OCEAN ENVIRONMENTS
*ANTARCTIC REGIONS
*PROTOZOA
*MORPHOLOGY(BIOLOGY)
LABORATORY TESTS
DISTRIBUTION
ELECTRON MICROSCOPY
SAMPLING
OPTICAL SCANNING
TAXONOMY
SUMMER
ECOLOGY
SEA ICE
CELL STRUCTURE
PLANKTON
REPRODUCTION(PHYSIOLOGY)
APPENDAGES
MITOCHONDRIA
PROTOPLASM
Choanoflagellates
Habitats
Flagella
Costae
Lorica
Antarctic
Austral
Weddell
Weddell Sea
Antarc*
ice algae
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA090680
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA090680
Description
Summary:Eight species of loricate choanoflagellates (Acanthoecidae), Acanthoecopsis spiculifera, Bicosta spinifera, Bicosta antennigera, Calliacantha simplex, Calliacantha multispina aff., Crinolina aperta, Diaphanoeca multiannulata, and Parvicorbicula socialis, were observed in samples obtained from the Weddell Sea during the austral summers, 1977. D. multiannulata was described for the first time from thse samples; the other organisms have either been described previously or are being described at this time. The distribution of most species within the Weddell Sea was widespread. The distributional, environmental, and morphological range of A. spiculifera, B. spinifera, C. aperta, and P. socialis was expanded. Habitats in which choanoflagellates were found included the water column, the edges of ice floes, ponds on ice floes, and the interiors of ice floes. The presence of choanoflagellates within the ice indicates that there may be a closely coupled trophic relationship with the other two biological components of the ice community, the ice algae and the bacteria. The presence in the ice of seven species with both a caudal appendage and anterior projections suggests a positive relationship between this lorica configuration and the ice habitat. Mechanisms of variance of transverse costal diameters between genera may be useful to the taxonomy and phylogeny of this family. (Author)

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