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A New Planktonic Diatom Species, Rhizosolenia sigmoida, from Upper Pliocene Sediments of the Equatorial Pacific Ocean

Ulf Sorhannus
Micropaleontology
Vol. 36, No. 1 (1990), pp. 102-103
DOI: 10.2307/1485669
Stable URL: http://www.jstor.org/stable/1485669
Page Count: 2
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Abstract

A new stratigraphically important species, Rhizosolenia sigmoida, is described from upper Pliocene sediments of the equatorial Pacific Ocean. It is distinguishable from Rhizosolenia bergonii Peragallo primarily by the length of the apical process and the shape of the apex of the calyptra. Rhizosolenia praebergonii Mukhina is separated from Rhizosolenia sigmoida by the inflection at the base of the apical process and the shape of the apex of the valve as well as by being temporally displaced.

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