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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

Actinosphaeridium spec.

Actinosphaeridium spec. Actinosphaeridium spec. Diagnosis: Cell surrounded by a kind of membranous shell. Filopodia with granules, sometimes branching. Cell not stalked, at least not observed.

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Euglyphidion

Euglyphidion enigmaticum – after Bonnet, 1960 Genus Euglyphidion Bonnet, 196 Diagnosis: Shell hyaline, ovoid, pseudostome circular or slightly elliptical. Shell loosely covered with two types of

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Leptomyxa spec.

Leptomyxa sp., slowly retracting in response to the light of the microscope Leptomyxa sp. Diagnose: This is a very large amoeba which I found in

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Zivkovicia spec.

Zivkovicia spec., 200 µm long; the right image is viewed through the aperture Zivkovicia spec.  Diagnosis: Shell pyriform, circular in oral view, with a clear

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Pontigulasia pentangulostoma

P. pentangulostoma, after Quin et al., 2008 Pontigulasia pentangulostoma Quin, Y., Xei, S., Gu, Y. and Zhou, X., 2008 Diagnosis: Shell is brown, laterally uncompressed,

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Flabellula citata

Flabellula citata, from Dykova et al., 2008 Flabellula citata Schaeffer, 1926 Diagnosis: Length in locomotion 15-75 µm; width 25-55 µm. Shape very variable, from a

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