Microworld

world of amoeboid organisms

Menu

Eumycetozoa

All known members fruit, either sorocarpically (Dictyostelia), or sporocarpically (Myxogastria, Protosporangiida); with a life cycle having a single haploid amoeboid state (Dictyostelia); or a life cycle with a bikont ciliated amoebae state that gives rise to a non-ciliate obligate amoeboid state from which sporocarps develop (Myxogastria and Protosporangiida); ciliated amoebae of myxogastrids and protosporangiids and amoebae of dictyostelids flat and form wide pseudopodia with acutely pointed subpseudopodia and no pronounced streaming of the granular cytoplasm; where sex is well studied, the zygote cannibalizes haploid amoebae.

These are true slime molds, divided into the myxomycetes, dictyostelids, and protostelids. The myxomycetes are plasmodial slime molds. These fungus-like organisms have a life cycle that involves two very different trophic (feeding) stages: uninucleate amoebae, with or without flagella, and plasmodia.

A plasmodium is a distinctive multinucleate structure that typically occurs in cool, moist, shady places like stumps and leaf litter on the forest floor. Under favorable conditions, the plasmodium gives rise to one or more fruiting bodies containing spores that are for most species dispersed by the wind and complete the life cycle by germinating to produce the uninucleate amoeboflagellate cells.
There are approximately 1000 recognized species of myxomycetes.

slime mold slijmzwam myxomycetes
Leocarpus fragilis?, Ardennes, Belgium
slime mold slijmzwam myxomycetes
Dwingeloo, Netherlands
slime mold slijmzwam myxomycetes
Netherlands
slime mold slijmzwam myxomycetes
Netherlands
slime mold slijmzwam myxomycetes
Netherlands
slijmzwam slime mold myxomycetes Patagonia
Chili, 2017
slime mold slijmzwam myxomycetes
Groeneveld, Netherlands
slime mold slijmzwam myxomycetes
Groeneveld, Netherlands
slijmzwam slime mold myxomycetes
Groeneveld, Netherlands
slime mold slijmzwam myxomycetes
Groeneveld, Netherlands
slime mold slijmzwam myxomycetes
Groeneveld, Netherlands

 

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 »