Record Details

Some aberrant foraminifera from the shelf sediments of central east coast of India

DRS at CSIR-National Institute of Oceanography

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Field Value
 
Title Some aberrant foraminifera from the shelf sediments of central east coast of India
 
Creator Setty, M.G.A.P.
Almeida, F.
 
Subject Geology and Geophysics
Aquatic Communities
Plankton
Zooplankton
Sediments
Foraminifera
ISW, India
 
Description A rich foraminiferal outer shelf assemblage has yielded some aberrant forms in the case of @iUvigerina@@ sp. @iSiphonoperta@@ sp., and @iNodosaria@@ sp. The aberration is (1) in the development of two terminal apertures with parallel necks and phialineiips in @iUvigerina@@ sp., (2) a twinned case in another @iUvigerina@@ sp., (3) development of two end chambers as last chamber instead of the usual one only in the case of @iSiphonoperta@@ sp., and (4) @iNodosaria@@ sp., showing a 'bend' at an angle after being straight for sometime. It is concluded that, after considering several causes for the aberrations, the two apertural @iUvigerina@@ sp., and the finally terminated two chambered @iSiphonoperta@@ sp., are cases of phylogerontism showing over-specialisation; the twinning in @iUvigerina@@ sp., as due to an accidental coalescence of two tests in the early stages of growth, and @iNodosaria@@ sp., showing a 'bend' as a result of damaged last chamber being recalcified with the terminal aperture shifting to an angle and continue to grow further maintaining the same direction. Thus, it appears to be a clear case of regeneration
 
Date 1994-01-27T09:56:31Z
2017-09-29T13:47:19Z
1994-01-27T09:56:31Z
2017-09-29T13:47:19Z
1972
 
Type Conference Article
 
Identifier Proceedings of the II Indian Colloquium on Micropalaeontology and Stratigraphy.; 1972; 103-106
http://drs.nio.org/drs/handle/2264/5856
 
Language en
 
Relation 2nd Indian Colloquium on Micropalaeontology and Stratigraphy; 1972
NON-SCI