Arcella

Belongs within: Arcellinida. Arcella is a genus of amoeboids with a rigid, chitinous test found in brackish to fresh water (Loeblich & Tappan 1964). Characters (from Loeblich & Tappan 1964): Test membranous, transparent, chitinoid, punctate or minutely cancellate, rarely spinose, hemispherical, recurved at circular to crenulate aperture (av. diam. 70µ), young tests hyaline, adult brown;… Continue reading Arcella

Published
Categorised as Amoebozoa

Tubulinea

Belongs within: Amoebozoa.Contains: Microcoryciidae, Arcellinida. The Tubulinea are a group of strictly amoeboid amoebozoans that are capable of producing tubular pseudopodia. Amoeba: much weirder than you think Published 2 September 2009 I have been challenged (or at least, I think I have been challenged) to write some posts on amoebozoans, the clade of eukaryotes that… Continue reading Tubulinea

Amoebozoa

Belongs within: Amorphea.Contains: Variosea, Eumycetozoa, Tubulinea, Archamoebae, Centramoebia, Thecamoebida, Vannellida, Paramoebidae. The Amoebozoa are a clade of primarily unicellular eukaryotes in which most members have an amoeboid stage in their life cycle; some are exclusively amoeboid. Members of the clade Eudiscosea produce flattened pseudopodia with a polyaxial cytoplasmic flow or lacking a pronounced axis, and… Continue reading Amoebozoa

Difflugia

Belongs within: Arcellinida. Difflugia is a genus of testate amoebozoans found in freshwater lakes and ponds, with a test composed of a combination of pseudochitin and agglutinated foreign material. They are known in the fossil record from the Eocene (Loeblich & Tappan 1964). Characters (from Loeblich & Tappan 1964): Test globular, elongate, pyriform, or acuminate,… Continue reading Difflugia

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Categorised as Amoebozoa

Arcellinida

Belongs within: Tubulinea.Contains: Arcella, Trigonopyxidae, Hyalospheniidae, Centropyxiidae, Plagiopyxidae, Difflugia. The Arcellinida, testate amoebae, are a group of amoebozoans which contain themselves inside an organic or mineral extracellular test of either self-secreted elements (calcareous, siliceous, or chitinoid) or recycled mineral particles bound together, with a single main opening. Pseudopodia are conical and pointed in species of… Continue reading Arcellinida

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Categorised as Amoebozoa

Centropyxiidae

Belongs within: Arcellinida. The Centropyxiidae are a group of testate amoebozoans with a chitinous test into which sand or other foreign matter has been incorporated (Loeblich & Tappan 1964). Characters (from Loeblich & Tappan 1964): Test chitinous, enclosing some foreign material or with sandy layer, generally with dorsoventral symmetry; aperture ventral, with recurved margin, eccentric;… Continue reading Centropyxiidae

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Categorised as Amoebozoa

Hyalospheniidae

Belongs within: Arcellinida. The Hyalospheniidae are a group of testate amoebozoans in which the test is composed of pseudochitin, and which have a distinctive pseudopodium conformation in which retreating pseudopodia leave a long thin pellicle that is slowly retracted (Loeblich & Tappan 1964). Characters (from Loeblich & Tappan 1964): Test pseudochitinous, with siliceous plates or… Continue reading Hyalospheniidae

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Categorised as Amoebozoa

Eumycetozoa

Belongs within: Amoebozoa.Contains: Lucisporidia, Columellidia. The Myxogastrea include the plasmodial slime moulds, amoeboid organisms that form a dispersed plasmodium in the nutritive phase of their life cycle, aggregating to form fruiting bodies in the reproductive phase. <==Eumycetozoa (see below for synonymy)AB19 | i. s.: Calyssosporium Corda 1831 (n. d.)KC01 | Halterophora Endl. 1836 (n. d.)… Continue reading Eumycetozoa

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Categorised as Amoebozoa

Archamoebae

Belongs within: Amoebozoa. The Archamoebae are a group of amoebozoans in which the mitochondria have been converted into nonaerobic organelles (Adl et al. 2012). Archamoebae: the apogee (or nadir) of amoebozoan evolution Published 18 September 2009 Among Amoebozoa, the Archamoebae are easily distinguishable by one significant feature—they lack mitochondria. Mitochondria are also absent in Breviata… Continue reading Archamoebae

Paramoebidae

Belongs within: Amoebozoa. The Paramoebidae are a family of flattened amoebae that produce finger-like anterior subpseudopodia. At least some paramoebids host minute endosymbionts close to the nucleus that were once mistaken for organelles, called parasomes. Characters (from Microworld): Locomotive form with digitiform, blunt subpseudopodia frequently extending from the anterior hyaloplasm; temporarily lacking in some species.… Continue reading Paramoebidae

Published
Categorised as Amoebozoa