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Landgoed Groeneveld – Baarn

This site was originally a country estate, but now it is a vast nature reserve, called Landgoed Groeneveld, located between the towns of Hilversum and Baarn, in the central area of the Netherlands. It consists mainly of woodland alternated with meadows. My samples come from a crescent shaped pond, with a sandy bottom and a thin layer of sediments.

The pond has a rich population of Difflugia tuberculata and Netzelia oviformis. Some interesting species which are found here:

  • Lecythium armatus
  • Raphidiophrys elegans
  • Arcella mitrata
  • Arcella crenulata
  • Biomyxa vagans
  • Pelomyxa corona
  • Metachaos spec.
  • Cyclopyxis intermedia
  • Zivkovicia spectabilis
  • Polychaos dubium
  • Frenzelina reniformis
  • Limnofila spec.
  • Hedriocystis brachipous
  • Difflugia nodosa
Sample location indicated by arrow
View of the pond
Detail of the above location, shallow water with sediments on the waterplants.
Recent posts

Spiculophrys

Genus Spiculophrys Zlatogursky, 2016 Diagnosis: Centrohelids lacking silica scales but with numerous thin, pointed organic (without any traces of silica) scales tapering towards acute apices. 18S

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Acanthocystis drakena

From Zlatogursky, 2016 Acanthocystis drakena Zlatogursky, 2016 Diagnosis: Cells are 21.1-30.5 µm (ca. 26.7) in diameter. Cell is covered with oval plate-scales having a margin

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Choanocystis symna

From Zlatogursky, 2014 Choanocystis symna Zlatogursky, 2014 Diagnosis: Cell body ca. 6.7 µm in diameter. Axopodia three–five times longer than a cell diameter. Plate-scales dumbbell-shaped

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Acanthocystis costata

From Zlatogursky, 2014 Acanthocystis costata Zlatogursky, 2014 Diagnosis: Cell body ca 9.5 µm in diameter. Axopodia 2–3 times longer than cell diameter. Length of spine-scales

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Kinetocyst

Left: ultra-structure of a kinetocyst of Raphidiophrys contractilis); right: two kinetocysts in an axopodium. Kinetocysts In centrohelid heliozoa, extrusomes are called kinetocysts, and are present

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Yogsothoth carteri

Yogsothoth carteri, after Shishkin and Zlatogursky, 2018 Yogsothoth carteri Shishkin and Zlatogursky, 2018 Diagnosis: Individual cells in a colony have a diameter of 9.7-15.2 µm;

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