Description
Centroheliozoa with a periplast comprising 2 types of tangential scales: the internal laye r plate-scales without a hollow marginal rim , and an external layer of plates with a well developed sternum and radiating ribs. The base of the sternum may be expanded and concave to create a velum-like extension of the scale. No records from light microscopy. Four species, a II freshwater. References: Durrschmidt ( 1 9 8 5), Groome (1987) ; Mikrjukov (1997) . formosa (after Durrschmidt, 1987) . periplast (after Siemensma , 1991 ).
Type species
Pseudoraphidiophrys formosa (Durrschmidt , 1985) Mikrjukov , 1997
Figures
Two types of scales of Pseudoraphidiophrys formosa (after Durrschmidt, 1987).
Raw text
Centroheliozoa with a periplast comprising 2 types of tangential scales: the internal laye r plate-scales without a hollow marginal rim , and an external layer of plates with a well developed sternum and radiating ribs. The base of the sternum may be expanded and concave to create a velum-like extension of the scale. No records from light microscopy. Four species, a II freshwater. References: Durrschmidt ( 1 9 8 5), Groome (1987) ; Mikrjukov (1997) . formosa (after Durrschmidt, 1987) . periplast (after Siemensma , 1991 ).