Geleia is a genus of karyorelict ciliates in the family Geleiidae.
The genus name is a taxonomic patronym honoring the Hungarian protistologist József von Gelei (1885-1952).
Systematics 17 species are currently described in the genus Geleia. Geleia acuta Dragesco, 1960 Geleia decolor Kahl, 1933 Geleia filiformes Nouzarède, 1976 Geleia fossata Kahl, 1933 is the type species of the genus. Geleia heterotricha Dragesco, 1960, redescribed as Gellertia heterotricha Dragesco, 1999 Geleia hyalina Dragesco, 1960 Geleia luci Dragesco, 1960 Geleia major Dragesco, 1954 Geleia martinicense Nouzarède, 1976 Geleia murmanica Raikov, 1962 Geleia nigriceps Kahl, 1933 Geleia obliqua Dragesco, 1960 Geleia orbis Fauré-Fremiet, 1951 Geleia simplex Fauré-Fremiet, 1951 Geleia swedmarki Dragesco Geleia tenuis Dragesco, 1954 Geleia vacuolata Dragesco, 1960
Phylogeny Comparison and phylogenetic analysis of 18S rRNA sequences showed that Geleia is the sister group to a clade grouping Parduczia orbis with Corlissina maricaensis.
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