Morphological observations on Pseudoeunotia linearis Carter (Bacillariophyta) and its transfer to the genus Eunotia

Abstract During a survey of the moss-inhabiting diatom flora of Gough Island (Tristan da Cunha archipelago, southern Atlantic Ocean), a large population of Pseudoeunotia linearis Carter has been observed. A detailed morphological analysis has been made using light and scanning electron microscopy to reveal its ultrastructure. The results show a eunotioid structure with short raphe branches, uniseriate striae with irregularly placed rimmed areolae, and marginal linking spines surrounding the valve face. Based on these features, the position of P. linearis within the genus Pseudoeunotia cannot be confirmed and a transfer to the genus Eunotia is therefore suggested.

[1]  J. Kociolek,et al.  The Diatom (Bacillariophyceae) Genus Actinella Lewis in Hawai‘i1 , 2013 .

[2]  P. Furey,et al.  Eunotia Ehrenberg (Bacillariophyta) of the Great Smoky Mountains National Park, USA , 2011 .

[3]  A. Sherwood,et al.  Three New Species of Cosmioneis (Bacillariophyceae) from Hawai'i , 2010 .

[4]  J. Kociolek,et al.  CATALOGUE OF THE DIATOM GENERA , 1999 .

[5]  David G. Mann,et al.  Diatoms: Biology and Morphology of the Genera , 1990 .

[6]  I. Koizumi,et al.  893. EVOLUTIONARY CHANGE IN DIATOM MORPHOLOGY : AN EXAMPLE FROM NITZSCHIA FOSSILIS TO PSEUDOEUNOTIA DOLIOLUS , 1990 .

[7]  N. Wace.  The vegetation of Gough Island , 1961 .

[8]  B. Vijver,et al.  The genus Pinnularia (Bacillariophyta) on Ile Amsterdam (TAAF,Southern Indian Ocean) , 2012 .

[9]  H. LANGE-BERTALOT,et al.  Eunotia and some related genera , 2011 .

[10]  B. Vijver,et al.  Orthoseira gremmenii sp. nov., a new aerophilic diatom from Gough Island (southern Atlantic Ocean) , 2008 .

[11]  H. Lange-Bertalot,et al.  Insel der Endemiten : geobotanisches Phänomen Neukaledonien = Island of endemics : New Caledonia - a geobotanical phenomenon , 1998 .

[12]  G. Moser.  Insel der Endemiten.Geobotanisches Phanomen Neukaledonien. , 1998 .

[13]  John Cooper,et al.  Management plan for the Gough Island wildlife reserve , 1994 .

[14]  L. Medlin,et al.  The transfer of Pseudoeunotia doliolus to Fragilariopsis , 1993 .

[15]  R. Patrick,et al.  The diatoms of the United States. , 1966 .

[16]  H. V. Heurck.  Synopsis des Diatomées de Belgique , 1885 .