A New Heterotrophic Cryptomonad: Hemiarma marina n. g., n. sp. (2nd July 2016)

• Record Type: Journal Article
• Authors: Shiratori, Takashi; Ishida, Ken‐ichiro
• Is Part Of: Journal of eukaryotic microbiology. Volume 63:Number 3(2016:May/Jun.)
• Page Start: 804
• Page End: 812
• Publication Date: 2016-07-02
• Subjects: Cryptista -- Cryptophyceae -- environmental sequences -- molecular phylogeny -- SSU rRNA -- ultrastructure; Protista -- Periodicals; Eukaryotic cells -- Periodicals; Microbiology -- Periodicals; 579.05
• DOI: 10.1111/jeu.12327
• Languages: English
• ISSNs: 1066-5234

Abstract

Abstract: We report a new heterotrophic cryptomonad Hemiarma marina n. g., n. sp. that was collected from a seaweed sample from the Republic of Palau. In our molecular phylogenetic analyses using the small subunit ribosomal RNA gene, H . marina formed a clade with two marine environmental sequences, and the clade was placed as a sister lineage of the freshwater cryptomonad environmental clade CRY1. Alternatively, in the concatenated large and small subunit ribosomal RNA gene phylogeny, H . marina was placed as a sister lineage of Goniomonas . Light and electron microscopic observations showed that H . marina shares several ultrastructural features with cryptomonads, such as flattened mitochondrial cristae, a periplast cell covering, and ejectisomes that consist of two coiled ribbon structures. On the other hand, H . marina exhibited unique behaviors, such as attaching to substrates with its posterior flagellum and displaying a jumping motion. H . marina also had unique periplast arrangement and flagellar transitional region. On the basis of both molecular and morphological information, we concluded that H . marina should be treated as new genus and species of cryptomonads.