''Arachnula'' is a genus of amoeboid eukaryotes first described by

Leon Cienkowski Lev Semyonovich Tsenkovsky (Leon Cienkowski, russian: Лев Семенович Ценковский) (October 1 ( N.S. October 13), 1822 in Warsaw – September 25 (N.S. October 7), 1887 in Leipzig) was a Polish botanist, protozoologist, ba ...

in 1876. Its phylogenetic position is a subject of some controversy. David Bass and colleagues considered it to be a vampyrellid within the

Endomyxa Endomyxa is a subphylum of Rhizaria The Rhizaria are an ill-defined but species-rich supergroup of mostly unicellular eukaryotes. Except for the Chlorarachniophytes and three species in the genus Paulinella in the phylum Cercozoa, they are ...

clade of

Rhizaria The Rhizaria are an ill-defined but species-rich supergroup of mostly unicellular eukaryotes. Except for the Chlorarachniophytes and three species in the genus Paulinella in the phylum Cercozoa, they are all non-photosynthethic, but many fora ...

, and the SSU rDNA sequence isolated from an organism described as ''Arachnula impatiens'' is indeed very close to that of the vampyrellid '' Theratromyxa''. The identification of this organism as ''Arachnula'' has, however, been questioned; and a separate amoeba identified as ''Arachnula'' by Yonas Isaak Tekle and colleagues groups in molecular phylogenies close to the amoebozoans '' Filamoeba'' and ''

Flamella An amoeba (; less commonly spelled ameba or amœba; plural ''am(o)ebas'' or ''am(o)ebae'' ), often called an amoeboid, is a type of cell or unicellular organism with the ability to alter its shape, primarily by extending and retracting pseudopo ...

''. Which of these isolates corresponds to that originally described by Cienkowski is unresolved.

Notes

References

* Proteomyxidea Cercozoa genera {{Cercozoa-stub