TY - JOUR

T1 - Raphidiophrys heterophryoidea sp. nov. (Centrohelida: Raphidiophryidae), the first heliozoan species with a combination of siliceous and organic skeletal elements

AU - Zlatogursky, V. V.

PY - 2012

Y1 - 2012

N2 - Centrohelid heliozoans form a monophyletic group with uncertain affinities to other groups of protists. Except for a number of naked species, they have either siliceous scales or organic spicules covering the cell. According to the phylogenetic analysis of the 18S rDNA gene, it is hypothesized that scales are the ancestral form of cell coverings, while spicules are derived structures. The present paper describes a new species of centrohelids, Raphidiophrys heterophryoidea, isolated from the inner lakes of Valamo Island (North-Western Russia). This species has tangential scales, consisting of two plates, connected with radial, sometimes branched septa. Raphidiophrys heterophryoidea also has radially oriented spindle-shaped spicules. The organic nature of spicules and the siliceous nature of scales were verified by energy-dispersive X-ray microanalysis. Such a combination of organic and siliceous skeletal elements in one heliozoan is novel for any heliozoan species. The complex bipartite structure of scales sug

AB - Centrohelid heliozoans form a monophyletic group with uncertain affinities to other groups of protists. Except for a number of naked species, they have either siliceous scales or organic spicules covering the cell. According to the phylogenetic analysis of the 18S rDNA gene, it is hypothesized that scales are the ancestral form of cell coverings, while spicules are derived structures. The present paper describes a new species of centrohelids, Raphidiophrys heterophryoidea, isolated from the inner lakes of Valamo Island (North-Western Russia). This species has tangential scales, consisting of two plates, connected with radial, sometimes branched septa. Raphidiophrys heterophryoidea also has radially oriented spindle-shaped spicules. The organic nature of spicules and the siliceous nature of scales were verified by energy-dispersive X-ray microanalysis. Such a combination of organic and siliceous skeletal elements in one heliozoan is novel for any heliozoan species. The complex bipartite structure of scales sug

KW - Centrohelids

KW - Heliozoa

KW - Protists

KW - Raphidiophrys

KW - Taxonomy

KW - Ultrastructure

U2 - 10.1016/j.ejop.2011.09.004

DO - 10.1016/j.ejop.2011.09.004

M3 - Article

VL - 48

SP - 9

EP - 16

JO - European Journal of Protistology

JF - European Journal of Protistology

SN - 0932-4739

IS - 1

ER -