A new centrohelid heliozoan, Pterocystis polycristalepis sp. nov., and taxonomic and phylogenetic concerns within Pterista (Haptista: Centroplasthelida).

Autor: Zagumyonnyi DG; Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Russia. Electronic address: zdmitryg@gmail.com., Tikhonenkov DV; Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Russia.
Jazyk: angličtina
Zdroj: European journal of protistology [Eur J Protistol] 2024 Jun; Vol. 94, pp. 126064. Date of Electronic Publication: 2024 Feb 20.
DOI: 10.1016/j.ejop.2024.126064
Abstrakt: A new species of centrohelid heliozoans, Pterocystis polycristalepis sp. nov. (Pterocystidae), was examined using light and electron microscopy. The novel centrohelid is characterized by the presence of leaf-like spine-scales with a broad pedicel-like structure on the proximal part and many subparallel ribs on the lateral wing surface. The plate-scales are ovoid with medial tubular thickening and many subparallel ribs on the very extensive marginal rim. The closely related species Pterocystis striata has also been studied in detail using light and electron microscopy. Phylogenetic analysis of 18S rRNA gene sequences placed both species into a separate clade within Pterista. The closest morphologically characterized species to the new clade is Triangulopteris lacunata. The 18S rRNA sequence of Pseudoraphidiophrys veliformis was grouped within Pterista and found to be closely related to Pterocystis polycristalepis, Pterocystis striata, and Triangulopteris lacunata. Cyst-scales of various shapes, cell and cyst aggregations, syncytia, and a cell with a stalk were revealed in a clonal culture of P. veliformis. Analysis of the morphology and phylogenetic position of the studied species and other centrohelids revealed a large number of taxonomic and phylogenetic problems in Pterista.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier GmbH. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: