Diving into Diversity: Haslea berepwari (Bacillariophyceae, Naviculaceae), a new species of marine diatom from New Caledonia
2025
Fiddy Semba Prasetiya | Thierry Jauffrais | Mustapha Mohamed-Benkada | Nolwenn Callac | Dominique Ansquer | Elif Yılmaz | Claude Lemieux | Monique Turmel | Jean-Luc Mouget | Danang Ambar Prabowo | Debora Christin Purbani | Diah Radini Noerdjito | Varian Fahmi | Sulastri Arsad | Romain Gastineau
The current article introduces and describes Haslea berepwari sp. nov., a new species of diatom discovered in the vicinity of Boulouparis, New Caledonia. Under light microscopy, H. berepwari sp. nov. strongly resembles Haslea pseudostrearia, but preliminary molecular barcoding conducted using partial 18S and rbcL genes suggested that it was a distinct species. This was confirmed first by scanning electron microscopy which showed the differences in stria densities between both species. A short-reads genome-skimming protocol applied on H. berepwari sp. nov. led us to obtain its complete mitochondrial and plastid genomes. The mitogenome is 36,572 bp in length and as already observed among other species of Haslea spp., the nad6 and nad2 genes are fused within a single open-reading frame. The plastome is 131,897 bp length, and unlike the mitogenome, it is not colinear with those of H. pseudostrearia. The results derived from the sequencing of the plastome allowed to perform a 123-gene multigene maximum likelihood phylogeny that associates H. berepwari sp. nov. to H. pseudostrearia with maximum support at the nodes but also strictly distinguishes them, suggesting a greater genetic distance between these species than what has been previously observed between other marennine-producing species.
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