Pterocystis foliacea
From Siemensma, 1991

Pterocystis foliacea (Dürrschmidt, 1985) Siemensma, 1991

Diagnosis: Periplast 10-20 µm; spine scales 2.2-8.1 µm, feather- or leaf-shaped, with two lateral wings tapering to the blunt apex; shaft only at the base well developed; plate scales 1.8-2.7 X 2.5-3.6 µm, oblong with slight central depression and a longitudinal rib.

Ecology: Fresh water lakes and marshes. Japan (Takahashi, 1959), Chili, New-Zealand, Sri Lanka (Dürrschmidt, 1985, 1987), The Netherlands (Siemensma, unpubl.), Australia (Croome, 1987).

Remarks: Dürrschmidt (1987) distinguishes two sub-species: P. foliacea elongata, with narrow and longer spine scales with blunt apex, and P. foliacea truncata with small, blunt spine-scales.

Pterocystis foliacea, dried cell – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pterocystis foliacea, scales – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pterocystis foliacea, scales – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pterocystis foliacea, spine scales – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pterocystis foliacea, spine scale – the Netherlands, SEM photomicrograph Eckhard Voelcker
Recent posts

Centropyxiella arenaria

  Centropyxiella arenaria , after Valkanov, 1970   Centropyxiella arenaria  Valkanov, 1970 Diagnosis: Test with almost parallel sides, covered with mineral grains; length varying strongly,

Read More »

Centropyxiella

  Genus Centropyxiella  Valkanov, 1970 Diagnosis: Test with plagiostome, embedded with xenosomes. Border of the pseudostome bent outwardly, in contrary to Centropyxis where the border

Read More »

Centropyxis armata

  Centropyxis armata, after Van Oye, 1952   Centropyxis armata  (Van Oye, 1952) n. comb.Basionym: Cyclopyxis armata Van Oye, 1952 Diagnosis: Test chitinoid, with relatively long

Read More »

Archerella elliptica

  Archerella elliptica, after Van Oye, 1956   Archerella elliptica  (Decloitre, 1974) n. comb.Basionym: Ditrema elliptica Decloitre, 1974   Diagnosis: Test elliptical with two apertures. Dimensions:

Read More »

Archerella jollyi

  Archerella jollyi, after Van Oye, 1956   Archerella jollyi  (Van Oye, 1956) n. comb.Basionym: Amphitrema jollyi Van Oye, 1956   Diagnosis: This species differs

Read More »