world of amoeboid organisms

Menu
Squamamoeba japonica – from Kudryavtsev and Pawlowski (2013)

Evosea Kang et al. 2017

Representatives of this clade can vary across almost the entire range of morphologies seen in Amoebozoa. Many members have complex life cycles that include amoeboid, ciliated and fruiting stages. Some species appear to be exclusively ciliated with no amoeboid features. Most taxa with only a subset of these life cycle stages.

The name Evosa was proposed by Kang et al. (2017) for a clade that contains the well-supported sub-clades Cutosea, Archamoebae, Eumycetozoa, and Variosea. They demonstrated that Cutosea belongs within this group and not within Lobosa. Evosea corresponds, more or less, with the traditional Conosa plus the Cutosea. Conosa is morphologically defined as having taxa with flagella, while Cutosea is devoid of flagellated taxa. Cutosea is represented by Sapocribrum, Squamamoeba, amoebae covered with very small scales.

The group that contains myxogastrids, dictyostelids, and protosporangiids is renamed Eumycetozoa.

In protosteloid evoseans, sex is sometimes thought to be associated with life cycles that include amoeboflagellates that germinate from spores and precede the development of nonflagellate obligate amoebae that subsequently produce the sporocarps

Reference:

Kang, S., Tice, A.K., Spiegel, F.W., Silberman, J.D., Pánek, T., Čepička, I., Kostka, M., Kosakyan, A., Alcântara, D.M., Roger, A.J., Shadwick, L.L., Smirnov, A., Kudryavstev, A., Lahr, D.J.G.,Brown, M.W. 2017. Between a pod and a hard test: the deep evolution of amoebae. Molecular Biology and Evolution. 34: 2258-2270.

Recent posts

Polychaos spec.

Polychaos spec. Polychaos spec. Diagnosis: Large amoeba with an irregular more or less polypodial shape during slow locomotion; uroid finely papillated, usually very large fasciculate

Read More »

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

Read More »

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

Read More »

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

Read More »

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

Read More »

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

Read More »