<abstract xmlns="http://www.w3.org/1999/xhtml"><p><italic>Cocconeis dapalistriata</italic>, first described as a member of the genus <italic>Cocconeis</italic>, is re-examined due to its unique ultrastructure. Both valvocopulae of this taxon show significant differences compared to those found in the genus <italic>Cocconeis</italic>. They are expanded and show some similarities with those found in <italic>Amphicocconeis</italic>. On the other hand, terminal parts of the raphe valve (RV) in <italic>C. dapalistriata</italic> are simple and the raphe valve (RV) striae are composed of small round areolae with a hymenate occlusion with radial slits, similar to those observed in <italic>Cocconeis</italic>. <italic>Campyloneis</italic> and <italic>Xenococconeis</italic> also have expanded valvocopulae but with numerous morphological differences compared to those found in <italic>C. dapalistriata</italic>. Furthermore, the areolae of the sternum valve (SV) in <italic>C. dapalistriata</italic> are occluded by a concave velum with no apparent internal slits, and externally ornamented with irregular silica crystals. <italic>Upsilococconeis</italic> Riaux-Gobin, Witkowski &amp; Risjani gen. nov. is proposed to accommodate the latter taxon. First described from the Western Indian Ocean (Mascarenes), it was subsequently listed from the Western Pacific Ocean (Guam), the South Pacific Ocean (French Polynesia and New Caledonia) and from the Eastern Indian Ocean (Indonesia), and thus may qualify as pantropical.</p></abstract>

Cocconeis dapalistriata, first described as a member of the genus Cocconeis, is re-examined due to its unique ultrastructure. Both valvocopulae of this taxon show significant differences compared to those found in the genus Cocconeis. They are expanded and show some similarities with those found in Amphicocconeis. On the other hand, terminal parts of the raphe valve (RV) in C. dapalistriata are simple and the raphe valve (RV) striae are composed of small round areolae with a hymenate occlusion with radial slits, similar to those observed in Cocconeis. Campyloneis and Xenococconeis also have expanded valvocopulae but with numerous morphological differences compared to those found in C. dapalistriata. Furthermore, the areolae of the sternum valve (SV) in C. dapalistriata are occluded by a concave velum with no apparent internal slits, and externally ornamented with irregular silica crystals. Upsilococconeis Riaux-Gobin, Witkowski & Risjani gen. nov. is proposed to accommodate the latter taxon. First described from the Western Indian Ocean (Mascarenes), it was subsequently listed from the Western Pacific Ocean (Guam), the South Pacific Ocean (French Polynesia and New Caledonia) and from the Eastern Indian Ocean (Indonesia), and thus may qualify as pantropical.

<italic>Upsilococconeis dapalistriata</italic> gen. nov. &amp; comb. nov. (Bacillariophyta) – a pantropical marine member of Cocconeidaceae

PSL Research University: CNRS-UPVD-EPHE, USR3278 CRIOBE

UMR250/9220 ENTROPIE IRD-CNRS-Ifremer-UNC-UR, Labex CORAIL, Nouméa

Department of Agroecology and Forest Utilization

Oceanological and Hydrobiological Studies

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

 gen. nov. & comb. nov. (Bacillariophyta) – a pantropical marine member of Cocconeidaceae

Cocconeis dapalistriata, first described as a member of the genus Cocconeis, is re-examined due to its unique ultrastructure. Both valvocopulae of this taxon...

Upsilococconeis dapalistriata gen. nov. & comb. nov. (Bacillariophyta) – a pantropical marine member of Cocconeidaceae

Article Category: Original research paper

Data publikacji: 31 mar 2022

Zakres stron: 23 - 31

Otrzymano: 15 cze 2021

Przyjęty: 05 lip 2021

DOI: https://doi.org/10.26881/oahs.2022.1.03

Słowa kluczowe
diatoms, benthic, pantropical, gen. nov., comb. nov

© 2022 Catherine Riaux-Gobin et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Upsilococconeis dapalistriata gen. nov. & comb. nov. (Bacillariophyta) – a pantropical marine member of Cocconeidaceae

Article Category: Original research paper

Data publikacji: 31 mar 2022

Zakres stron: 23 - 31

Otrzymano: 15 cze 2021

Przyjęty: 05 lip 2021

DOI: https://doi.org/10.26881/oahs.2022.1.03

Słowa kluczowediatoms, benthic, pantropical, gen. nov., comb. nov

© 2022 Catherine Riaux-Gobin et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Słowa kluczowe
diatoms, benthic, pantropical, gen. nov., comb. nov