Pseudostriatella(Bacillariophyta): a description of a new araphid diatom genus based on observations of frustule and auxospore structure and 18S rDNA phylogeny
- 1 July 2008
- journal article
- Published by Taylor & Francis in Phycologia
- Vol. 47 (4) , 371-391
Abstract
Pseudostriatella oceanica gen et. sp. nov. is a marine benthic diatom that resembles Striatella unipunctata in gross morphology, attachment to the substratum by a mucilaginous stalk and possession of septate girdle bands. In light microscopy, P. oceanica can be distinguished from S. unipunctata by plastid shape, absence of truncation of the corners of the frustule, indiscernible striation and absence of polar rimoportulae. With scanning electron microscopy, P. oceanica can be distinguished by a prominent but unthickened longitudinal hyaline area, pegged areolae, multiple marginal rimoportulae and perforated septum. The hyaline area differs from the sterna of most pennate diatoms in being porous toward its expanded ends; in this respect, it resembles the elongate annuli of some centric diatoms, such as Attheya and Odontella. 18S rDNA phylogeny places P. oceanica among the pennate diatoms and supports a close relationship between P. oceanica and S. unipunctata, but the genetic distance between them...Keywords
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