Molecular, morphological and chemical diversity of two new species of Antarctic Diatoms, Craspedostauros ineffabilis sp. nov. and Craspedostauros zucchellii sp. nov.

The current study focuses on the biological diversity of two strains of Antarctic diatoms (strains IMA082A and IMA088A) collected and isolated from the Ross Sea (Antarctica) during the XXXIV Italian Antarctic Expedition. Both species presented the typical morphological characters of the genus Craspe...

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Bibliographic Details
Published in:Journal of Marine Science and Engineering
Main Authors: Trentin, Riccardo, Moschin, Emanuela, Lopes, André Duarte, Schiaparelli, Stefano, L, Custódio, Moro, Isabella
Format: Article in Journal/Newspaper
Language:English
Published: MDPI 2022
Subjects:
Antarctica
Biodiversity
Ross Sea
Diatoms
Craspedostauros
Craspedostauros ineffabilis sp. nov
Craspedostauros zucchellii sp. nov
Morphology
Molecular phylogeny
Chemical diversity
Antarctic
Antarc*
Online Access:http://hdl.handle.net/10400.1/18500
https://doi.org/10.3390/jmse10111656
Description
Summary:The current study focuses on the biological diversity of two strains of Antarctic diatoms (strains IMA082A and IMA088A) collected and isolated from the Ross Sea (Antarctica) during the XXXIV Italian Antarctic Expedition. Both species presented the typical morphological characters of the genus Craspedostauros: cribrate areolae, two “fore-and-aft” chloroplasts and a narrow “stauros”. This classification is congruent with the molecular phylogeny based on the concatenated 18S rDNArbcL-psbC alignment, which showed that these algae formed a monophyletic lineage including six taxonomically accepted species of Craspedostauros. Since the study of the evolution of this genus and of others raphe-bearing diatoms with a “stauros” is particularly challenging and their phylogeny is still debated, we tested alternative tree topologies to evaluate the relationships among these taxa. The metabolic fingerprinting approach was implemented for the assessment of the chemical diversity of IMA082A and IMA088A. In conclusion, combining (1) traditional morphological features used in diatoms identification, (2) phylogenetic analyses of the small subunit rDNA (18S rDNA), rbcL and psbC genes, and (3) metabolic fingerprint, we described the strains IMA082A and IMA088A as Craspedostauros ineffabilis sp. nov. and Craspedostauros zucchellii sp. nov. as new species, respectively info:eu-repo/semantics/publishedVersion

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