Ref ID : 4670
John P. Cann and Frederick C. Page; Nucleosphaerium tuckeri nov. gen. nov. sp.- A New Freshwater Filose Amoeba Without Motile Form in a New Family Nucleariidae (Filosea: Aconchulinida) Feeding by Ingestion Only. Arch.Protistenk 122:226-240, 1979
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A new non-motile member of the Aconchulinida is described and compared with two other members Nuclearia and Vampyrella. A new family, Nucleariidae is proposed for filose amoebae which engulf food particles, including the genera Nuclearia and Nucleosphaerium. Comparisons are also made with the genera Asterocaelum, Penardia, and Heliosphaerium. The characteristic shape of Nucleosphaerium tuckeri is spherical, and no motile form was observed. Fine filose pseudopodia radiate from the cell surface, and the organism has an external mucilaginous coat with adherent bacteria. The central nucleus contains a large lobed nucleolus. Numerous internal endozoic bacteria were observed. A new definition for filose pseudopodia is suggested, and a taxonomic outline of the class Filosea is included.