Cocconeis subantarctica sp. nov. from Kerguelen Archipelago (Austral Ocean) and comparison with Cocconeis stauroneiformis (W.Smith) Okuno

Abstract Cocconeis subantarctica sp. nov., a small monoraphid marine diatom, previously described as C. scutellum cf. var. parva Grunow, is reported from the Kerguelen Archipelago. Based on the careful re-examination of the material using SEM (scanning electron microscopy), both valves and the cingu...

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Bibliographic Details
Published in:Oceanological and Hydrobiological Studies
Main Authors: Riaux-Gobin, Catherine, Witkowski, Andrzej
Format: Article in Journal/Newspaper
Language:English
Published: Walter de Gruyter GmbH 2017
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Online Access:http://dx.doi.org/10.1515/ohs-2017-0036
http://www.degruyter.com/view/j/ohs.2017.46.issue-3/ohs-2017-0036/ohs-2017-0036.xml
https://www.degruyter.com/document/doi/10.1515/ohs-2017-0036/xml
https://www.sciendo.com/pdf/10.1515/ohs-2017-0036
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Summary:Abstract Cocconeis subantarctica sp. nov., a small monoraphid marine diatom, previously described as C. scutellum cf. var. parva Grunow, is reported from the Kerguelen Archipelago. Based on the careful re-examination of the material using SEM (scanning electron microscopy), both valves and the cingulum were described, which enabled a better classification of this small Subantarctic taxon. The shape of the frustule is widely rounded to subdiscoid, with uniseriate and radiate striae on both valves. The SV (sternum valve) areolae have rota-like hymenate pore occlusions, with larger marginal areolae separated by a hyaline rim. The RV (raphe valve) areolae are more complex than those of the SV, with several reniform concentric hymenate occlusions. This taxon has no real stauros, only one virga, which is larger on one side of each valve. The species is not a member of the Cocconeis scutellum ‘complex’, but is closely related to C. stauroneiformis despite several morphological differences.