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Genus Ovulinata

Shell is ovoid, small (15 µm), organic, lacking scales or mineral particles, aperture is terminal, circular to oval, pseudopodia filose, hyaline (sometimes branched), long tapering to a point, arising directly from aperture or from the periphery of a web of hyaline cytoplasm emergent from the aperture. Mitochondria with tubular cristae. Ecology: marine interstitial. Type species: Ovulinata parva Anderson et al., 1997. Note: After original description (Anderson et al., 1996, 1997) Howe et al. (2011) placed the genus to a new family Ovulinatidae. Diagnosis: filose amoebae with ovoid organic shell, lacking scales or mineral particles, aperture is circular to oval; pseudopodia hyaline, sometimes branched, long, tapering to a point, arising directly from aperture or fromweb of hyaline cytoplasm emergent from it. Differs from its sister family Paulinellidae by lacking silica scales or plastid-like enslaved cyanobacterium. Type genus: Ovulinata Anderson, Rogerson et Hannah, 1997. This new family is essential because the trees show that Ovulinata was previously wrongly classified in Pseudodifflugiidae (Thecofilosea) and must be transferred to Imbricatea and Euglyphida. It differs so radically from Paulinella that it cannot be included in the same family.