TY - JOUR

T1 - Pinjata ruminata gen.et sp. n. – a new member of centrohelid family Yogsothothidae (Haptista: Centroplasthelida) from saline environment

AU - Zlatogursky, Vasily V.

AU - Gerasimova, Elena A.

AU - Drachko, Daria

AU - Klimov, Vladimir I.

AU - Shɨshkin, Yegor

AU - Plotnikov, Andrey O.

PY - 2019

Y1 - 2019

N2 - A new genus and species of centrohelid heliozoan Pinjata ruminata from the Tuzlukkol’ River (Orenburg Region of Russia) and Gorʼkoe Lake (Chelyabinsk Region of Russia) is studied with light- and electron microscopy. Pinjata ruminata has two types of plate scales, partially running up the sides of the axopodia. Inner plate scales (3.2–4.9 × 1.5–2.6 μm) are flat, ovate-oblong and have a broad axial thickening and a thin electron-dense border. Outer plate scales (4.2–6.7 × 1.5–3.0 μm) are concave, elongated, of irregular shape, often curved, and broadened towards one end. Roundish depressions are forming two rows on both sides of the narrow axial thickening. The cells are attached to the substratum. Molecular phylogenetic analysis based on the SSU rDNA robustly placed P. ruminata in the family Yogsothothidae. This position is confirmed with the presence of five panacanthocystid increase regions. The morphology of the new genus is in a good accordance with diagnosis of the family. The status of a genus “Heteroraphidiophrys” is discussed. Other potential findings of Pinjata from literature are analyzed. Pinjata represents the third lineage of centrohelids, characterized with the presence of only tangentially oriented plate scales. The halophilic nature of Yogsothothidae is suggested.

AB - A new genus and species of centrohelid heliozoan Pinjata ruminata from the Tuzlukkol’ River (Orenburg Region of Russia) and Gorʼkoe Lake (Chelyabinsk Region of Russia) is studied with light- and electron microscopy. Pinjata ruminata has two types of plate scales, partially running up the sides of the axopodia. Inner plate scales (3.2–4.9 × 1.5–2.6 μm) are flat, ovate-oblong and have a broad axial thickening and a thin electron-dense border. Outer plate scales (4.2–6.7 × 1.5–3.0 μm) are concave, elongated, of irregular shape, often curved, and broadened towards one end. Roundish depressions are forming two rows on both sides of the narrow axial thickening. The cells are attached to the substratum. Molecular phylogenetic analysis based on the SSU rDNA robustly placed P. ruminata in the family Yogsothothidae. This position is confirmed with the presence of five panacanthocystid increase regions. The morphology of the new genus is in a good accordance with diagnosis of the family. The status of a genus “Heteroraphidiophrys” is discussed. Other potential findings of Pinjata from literature are analyzed. Pinjata represents the third lineage of centrohelids, characterized with the presence of only tangentially oriented plate scales. The halophilic nature of Yogsothothidae is suggested.

KW - External skeleton

KW - heliozoa

KW - protists

KW - systematics

KW - ultrastructure

KW - EVOLUTION

KW - RAPHIDIOPHRYS-HETEROPHRYOIDEA

KW - HELIOZOA

KW - MOLECULAR PHYLOGENY

UR - http://www.scopus.com/inward/record.url?scp=85065424511&partnerID=8YFLogxK

U2 - 10.1111/jeu.12737

DO - 10.1111/jeu.12737

M3 - Article

VL - 66

SP - 862

EP - 868

JO - Journal of Eukaryotic Microbiology

JF - Journal of Eukaryotic Microbiology

SN - 1066-5234

IS - 6

ER -