Microworld

world of amoeboid organisms

Menu
Hedriocystis brachypous
Hedriocystis brachypous – Oppad, the Netherlands

Hedriocystis brachypous (De Saedeleer, 1930) Siemensma, 1981
Basionym: Monomastigocystis brachypous De Saedeleer, 1930

Diagnosis: Shell colorless, hyaline, polygonal in circumference; holes on top of conical protuberances; stalk not present or shorter than the shell diameter; stalk connected to a somewhat elongated conical protuberance; axopodia finely granulated; nucleus centrally located, zoospores with one flagellum.

Dimensions: Test 13.0-21.1 µm.

Ecology: on waterplants and in sediments of mesotrophic ponds and ditches. I found this species recently in Groeneveld and along the Oppad, both in the Netherlands. This species is known from Europe and North-America (Charles Krebs)

Remarks: The shell can only be distinguished from Hedriocystis pellucida by its short or absent stalk.

Look here for the feeding process of Hedriocystis.

Hedriocystis brachypous
Cysts
Hedriocystis brachypous
Hedriocystis brachypous
Left: cyst, right: trophozoite
Hedriocystis brachypous
Hedriocystis brachypous – Photomicrograph: Charles Krebs
Hedriocystis brachypous
Hedriocystis brachypous – from Siemensma, 1982
Recent posts

Penardochlamys arcelloides

P. arcelloides – from Penard, 1904 Penardochlamys arcelloides  (Penard, 1904) Deflandre, 1953 Diagnosis: Colorless or very slightly yellowish envelope, bag or cauldron-shaped, very thin, chitinous,

Read More »

Reticulomyxa hannae

R. hannae, plasmodium – photomicrograph Steffen Clauss Reticulomyxa hannae Völcker and Clauß, 2020 Diagnosis: Trophozoites surrounded by a very thin mucous envelope, with slowly moving plasmodia, variable

Read More »

Velamentofex saxonensis

V. saxonensis, feeding (photomicrograph Steffen Clauss) Velamentofex saxonensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 30-95 μm, granuloreticulopodia up to 1000 μm long. with a hyaline, thin

Read More »

Velamentofex tyrolensis

V. tyrolensis (photomicrograph Steffen Clauss) Velamentofex tyrolensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 98-125 μm, with reticulopodia up to 300 μm long, with a hyaline,

Read More »

Velamentofex berolinensis

V. berolinensis Velamentofex berolinensis Völcker and Clauß, 2020 Diagnosis: Trophozoites ovoid, 50-300 µm, with a hyaline, extremely flexible, membranous test. Nuclei numerous, 11.6-16.2 µm in diameter,

Read More »

Lieberkuehniidae

 Lieberkuehniidae  Siemensma, Holzmann, Apothéloz-Perret-Gentil, Clauß, Voelcker, Bettighofer, Khanipour Roshan, Walden, Dumack and Pawlowski, 2020 Diagnosis: Multinucleate organic-walled monothalamous foraminifera. Test very flexible, elongated to broadly

Read More »