Pterocystis

Description

Centroheliozoa with a periplast with an internal layer of tangential plate-scales and external layer of radial sp icules. These spicules consist of a shaft and a thin , membranous basal region which may extend along the shaft and may form a s t a I k- like protrusion at the base of the spicule . The membranous regi on is not clearly differentiated into lateral and basal regions as in Echinocystis. Ten species , all from freshwater. Reference : Mikrjukov (1 997) . 1988 Fi g. 12. Echin ocystis erinaceoides and elements of it peripl ast (aft er Siemensma , 1991 ).

Type species

Pterocystis pteracantha (Siemensma, 1981) Siemensma & Roijackers, 1988

Figures

unreviewedreviewedneeds-correctionbad-cropimage-crop-candidate

Raw text

Centroheliozoa with a periplast with an internal
layer of tangential plate-scales and external layer
of radial sp icules. These spicules consist of a
shaft and a thin , membranous basal region which
may extend along the shaft and may form a s t a I k-
like protrusion at the base of the spicule . The
membranous regi on is not clearly differentiated
into lateral and basal regions as in Echinocystis.
Ten species , all from freshwater. Reference :
Mikrjukov (1 997) .
1988
Fi g. 12. Echin ocystis erinaceoides and elements of it
peripl ast (aft er Siemensma , 1991 ).