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Scientific classification
Domain: Eukaryota
Kingdom: Chromalveolata
Superphylum: Alveolata
Phylum: Apicomplexa
Levine 1970
Class: Conoidasida
Levine 1988
Subclass: Gregarinasina
Dufour 1828
Order: Eugregarinorida
Grassé & Schrével 1953
Family: Blastogregarinorina
Genus: Siedleckia

Siedleckia caulleryi
Siedleckia dogieli
Siedleckia mesnili
Siedleckia nematoides

Siedleckia are a genus of parasitic protozoa in the phylum Apicomplexa. Species in this genus infect marine invertebrates.


This genus was described by Caullery and Mesnil in 1898.

There are four species recognised in this genus.

The type species is Siedleckia nematoides.

The taxonomic position of this genus is unclear and it may be related to the gregarines or to the coccidians.[1]


The gamonts are elongated and flattened. They possess a smooth surface lacking any grooves or folds.

The pellicle appears to be trilaminar and longitudinal microtubules lie deep to it. The parasite attaches to the host cell via mucron.

Feeding mode is apparently by myzocytosis.

Life cycle[edit]

The parasite infects the gastrointestinal tract and is presumably transmitted by the orofaecal route but the details of this mechanism are presently unknown.

Species in this genus infect the polychete worm Scoloplos armiger.


  1. ^ Diakin A, Simdyanov TG, Paskerova G, Alesohin VV, Entzeroth R, Schrevel J, Valigurova A (2012) Phylogenetic study on early emerging apicomplexans with emphasis on genera Eleutheroschizon and Siedleckia. In: X. české a slovenské parazitologické dny. ISBN 978-80-210-5862-0