There and back again: coverings evolution in centrohelid heliozoans. / Zlatogursky, Vasily.
2015. 228 Abstract from VII European Congress of Protistology, Sevilla, Spain.Research output: Contribution to conference › Abstract
}
TY - CONF
T1 - There and back again: coverings evolution in centrohelid heliozoans
AU - Zlatogursky, Vasily
PY - 2015
Y1 - 2015
N2 - Centrohelid heliozoans are non-ciliated axopodial protists of uncertain affinities. Cell coverings (organic spicules, siliceous plate-scales and spine-scales) are the main criterion for species identification and higher-rank taxonomy in this group. Phylogenetic reconstructions of centrohelids evolution are mostly based on the sequences of 18S rRNA gene. Newly obtained 18S rRNA sequences, as well as light- and electron-microscopic data led to discoveries of some previously unknown evolutionary events in centrohelids. An interpretation of the cell coverings evolution as a mostly parallel process in two orders is proposed. According to this hypothesis cell coverings were ancestrally organic, then independently silicified and after that multiple cases of desilicification or even complete loss of coverings took place. The family Raphidiophryidae was shown to be polyphyletic and spread between two centrohelid orders. The organisms with organic spicules only (here referred to as Heterophrys-like organisms, HLO) reve
AB - Centrohelid heliozoans are non-ciliated axopodial protists of uncertain affinities. Cell coverings (organic spicules, siliceous plate-scales and spine-scales) are the main criterion for species identification and higher-rank taxonomy in this group. Phylogenetic reconstructions of centrohelids evolution are mostly based on the sequences of 18S rRNA gene. Newly obtained 18S rRNA sequences, as well as light- and electron-microscopic data led to discoveries of some previously unknown evolutionary events in centrohelids. An interpretation of the cell coverings evolution as a mostly parallel process in two orders is proposed. According to this hypothesis cell coverings were ancestrally organic, then independently silicified and after that multiple cases of desilicification or even complete loss of coverings took place. The family Raphidiophryidae was shown to be polyphyletic and spread between two centrohelid orders. The organisms with organic spicules only (here referred to as Heterophrys-like organisms, HLO) reve
KW - зоология
KW - протистология
KW - филогения
M3 - Abstract
SP - 228
T2 - VII European Congress of Protistology
Y2 - 4 September 2015 through 9 September 2015
ER -
ID: 6940697