Pompholyxophrys punicea (Archer, 1869)
Most likely ID: n.a.
Synonym: Hyalolampe fenestrate, Hyalolampe fenestrata
Sampling location: Simmelried, Purren pond, Ulmisried
Phylogenetic tree: Pompholyxophrys punicae
Diagnosis:
- cell spherical, covered with spherical scales
- diameter 24–65 µm (inclusive layer auf scales
- scales 1–7.5 µm in diameter, hollow, transparent
- cytoplasm orange or reddish with colored granules
- feeding on algae
- nucleus located eccentrically, with central nucleoulus
- no visible contractile vacuole
- pseudopodia fine and short
I find Pompholyxophrys punicea regularly, but never frequently in some of my sites. Mostly I find specimens at the bottom of old samples with little plant material. The cells can be recognized by their orange coloration even at low magnification. However, the beautiful pearly scales surrounding the cell body can only be seen at high magnifications. Often the spherules are layered in multiple, concentric layers, with the smallest spherules forming the innermost layer. The spherical scales are formed by the cell itself and consist of amorphous silicon.
Fig. 1 a-b: Pompholyxophrys punicea. D = 77 µm (of squashed specimen). A squashed specimen with an intense orange color. Note the layers of transparent spherules covering the cell. Obj. 100 X.
Fig. 2 a-b: Pompholyxophrys punicea. D = 50 µm (of squashed specimen). A squashed specimen with a large number of ingested algae. Nu = nucleus. Obj. 100 X.
Fig. 3 a-b: Pompholyxophrys punicea. D = 62 µm (of squashed specimen). A squashed specimen with extended pseudopodia (PP). Nu = nucleus. Obj. 100 X.