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Publication
Molecular, morphological and chemical diversity of two new species of Antarctic Diatoms, Craspedostauros ineffabilis sp. nov. and Craspedostauros zucchellii sp. nov.
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Advisor(s)
Abstract(s)
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
Description
Keywords
Antarctica Biodiversity Ross Sea Diatoms Craspedostauros Craspedostauros ineffabilis sp. nov. Craspedostauros zucchellii sp. nov. Morphology Molecular phylogeny Chemical diversity
Citation
Journal of Marine Science and Engineering 10 (11): 1656 (2022)
Publisher
MDPI