New clade of silicified bolidophytes that belong to Triparma (Bolidophyceae, Stramenopiles). Issue 2 (24th October 2019)

• Record Type: Journal Article
• Authors: Yamada, Kazumasa; Sato, Shinya; Yamazaki, Masashi; Yoshikawa, Shinya; Kuwata, Akira; Ichinomiya, Mutsuo
• Is Part Of: Phycological research. Volume 68:Issue 2(2020:Apr.)
• Page Start: 178
• Page End: 182
• Publication Date: 2019-10-24
• Subjects: flagellated form -- life cycle -- monophyly -- multiple secondary loss -- Parmales -- siliceous cell wall; Algae -- Japan -- Periodicals; Algae -- Periodicals; 579.8
• DOI: 10.1111/pre.12413
• Languages: English
• ISSNs: 1322-0829

Abstract

SUMMARY: The small phytoplankton genus Triparma belongs to the class Bolidophyceae and contains two distinct forms: silicified species and naked flagellated species (formerly Bolidomonas ). Recent studies showed that four silicified species/strains ( Triparma laevis f. inornata, T. laevis f. longispina, T. strigata, and T . aff. verrucosa ) belong to a single clade that is paraphyletic, because it also contains an unclassified flagellated strain, and is sister to a flagellated species, T. eleuthera . In this study, we isolated and characterized two new strains of silicified species to test the phylogenetic unity of silicified bolidophytes. The isolates were identified as T. retinervis strains because they possessed fine areolation on the cell wall. 18S rDNA and rbc L phylogenetic analyses demonstrated that T. retinervis formed a new silicified clade that is sister to the flagellated species T. pacifica . This reveals that there are at least two distinct clades including both silicified and flagellated Triparma species.