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GOMPHONEIS MESTA (BACILLARIOPHYTA). II. MORPHOLOGY OF THE INITIAL FRUSTULES AND PERIZONIUM ULTRASTRUCTURE WITH SOME INFERENCES ABOUT DIATOM EVOLUTION 1
Author(s) -
PassyTolar Sophia I.,
Lowe Rex L.
Publication year - 1995
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1995.00447.x
Subject(s) - biology , ultrastructure , diatom , sensu , anatomy , morphology (biology) , paleontology , genus , botany
The morphology of initial frustules of Gomphoneis mesta Passy‐Tolar & Lowe was studied with light and scanning electron microscopy The structure of the raphe, central nodule, stigma, striae, and apical pore field in post‐auxospore generations was described. Discovery of internal chambers and an axial plate in very early stages of the life cycle of G . mesta reveals a possible evolutionary connection with the Herculeana group (sensu Kociolek and Stoermer 1989) and suggests that the loss of axial plates is a secondary event. Polarization of the characters “stigma number” and “outline of the internal stigmal opening” is proposed. A perizonium, composed of transverse and longitudinal bands, is reported for the first time in the genus Gomphoneis.