Taxonomy and Valve Ultrastructure of New and Interesting Freshwater Fossil Diatoms (Bacillariophyta) of Miocene age from the Espanola Formation of New Mexico, USA. I. Ontogeny of Tetracyclus stelloides sp. nov., with Comments on ‘Accepted Names’ and Hustedt's Concepts of ‘Convergence’ and ‘Miserable Forms’
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Abstract
We present the size diminution series of a new species of Tetracyclus, described herein as Tetracyclus stelloides Kociolek, D.M.Williams & Danz sp. nov., based on light and scanning electron microscopic observations. The largest cells of T. stelloides sp. nov. are cruciate in outline with broadly rounded apices and central inflations, the smallest cells are elliptical. Size, presence and position of a rimoportula, and valve shape differentiate this species from other described taxa in the genus. We discuss the ontogeny of this cell cycle in the context of Hustedt's concept of convergence and ‘miserable forms’. The taxonomic and nomenclatural implications of these findings for other species of Tetracyclus are discussed, and we explore the confusion and challenges related to the idea of ‘Accepted Names’ in this regard.
期刊介绍：
Diatom Research is the journal of the International Society for Diatom Research. The journal is published quarterly, in March, June, September and December, and welcomes manuscripts on any aspect of diatom biology.
In addition to full-length papers, short notes and reviews of recent literature are published which need not contain all the sections required for full-length papers; we see these as being necessary to record information which is of interest but which cannot be followed up in detail. Discursive “Opinion” papers are encouraged which would not necessarily follow the normal lay-out. If extremely long papers are to be offered, the author(s) should contact the editors first to discuss any problems. Book reviews, obituaries and meeting reports can be published. All papers will be subject to critical review by the editors and referees, as appropriate to their content. Papers will be accepted in English only.
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