Microworld

world of amoeboid organisms

Menu
Pinaciophora fluviatilis
P. fluviatilis, note the perforated plate scales in lateral view.

Pinaciophora fluviatilis Greeff, 1873 sensu Penard, 1904

Diagnosis: Cells spherical to ovoid with a diameter ranging from 45-50 µm. The plate-scales are circular, discoid, 4-6 µm in diameter; they are flat and have commonly a distinct hexagonal pattern of large boles. 17-24 in number, mostly arranged in a regular 3-4-5-4-3 or a 4-5-6-5-4 sequence. Smaller perforations are irregularly distributed along the periphery. Nucleus relatively large, finely granulated with a larger granule in the center.

Ecology: Freshwater; oligotrophic and mesotrophic water-types; between water plants and in sediment of shallow waters. In lakes, marshes, canals, ditches streams and rivers. Consuming detritus and algae. Reported from Germany Greeff, 1873, Rainer, 1968), Scandinavia (Thomsen, 1978), United Kingdom (Belcher and Swale, 1978), the Netherlands (Siemensma, 1991), Peru, Texas (Gaarder et al., 1976), Antarctica (Takahashi, 1981).
I found it at several locations, e.g. a small fountain fed by a small natural stream (Royal Palace het Loo), in a large lake, the IJsselmeer, near Kornwerderzand, in another lake, the Spiegelplas, and a shallow ditch in Gaasterland, all in the Netherlands.

Pinaciophora fluviatilis
P. fluviatilis
Pinaciophora fluviatilis
Pinaciophora fluviatilis, dried specimen – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pinaciophora fluviatilis
Pinaciophora fluviatilis, plate scales – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pinaciophora fluviatilis
Pinaciophora fluviatilis, plate scale – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pinaciophora fluviatilis
Pinaciophora fluviatilis, plate scale with structure of the basal plate – the Netherlands, SEM photomicrograph Eckhard Voelcker
Pinaciophora fluviatilis
Pinaciophora fluviatilis – after Siemensma, 1991: b-c TEM-photomicrographs of plate-scales – drawing: Ferry Siemensma; TEM: Rudy Roijackers
Pinaciophora fluviatilis
Pinaciophora fluviatilis
Scale after Thomsen 1978; Relatively large nucleus and small nucleolus
Habitus
Holes in the scales as seen by light microscopy
Pinaciophora fluviatilis
P. fluviatilis
Pinaciophora fluviatilis
Pinaciophora fluviatilis, note the perforated plate scales
Recent posts

Diplophrys spec. 7

Diplophrys spec., with three tufts of filopodia Diplophrys spec. These cells are granular, never seen before. I found them in a sample from the Bert

Read More »

Psammonobiotus spec.

I found this specimen in a sample from the Oppad, near Hilversum, 2020. It is similar to Psammonobiotus linearis, but lacks a clear spine at

Read More »

Sphenoderia compressa

Sphenoderia compressa, after Badewitz, 2002 Sphenoderia compressa Badewitz, 2002 Diagnosis: Test ovoid, oval in cross section, hyaline, covered with relatively small, oval, rather irregularly arranged

Read More »

Tracheleuglypha elongata

T. elongata, A-C after Thomas and Gauthier-Lièvre, 1959; D after Van Oye, 1959 Tracheleuglypha elongata Van Oye, 1959 Diagnosis: Test similar to T. dentata, but

Read More »

Tracheleuglypha acolla

T. acolla, after Bonnet and Thomas, 1960 Tracheleuglypha acolla Bonnet and Thomas, 1955 Diagnosis: Test ovoid, non compressed, round in cross-section, with large oval overlapping

Read More »

Cyclopyxis kahli oblonga

C. kahli f. oblonga , after Tarnogradskii, 1959 Cyclopyxis kahli f. oblonga  (Tarnogradskii, 1959) Centropyxis kahli f. oblonga Tarnogradskii, 1959 Diagnosis:  Test with all the

Read More »