Selenidium is a genus of parasitic alveolates in the phylum Apicomplexa. Species in this genus infect marine invertebrates.

Selenidium
Scientific classification
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Selenidium

Giard, 1884
Species

Selenidium alleni
Selenidium amphinomi
Selenidium annulatum
Selenidium axiferens
Selenidium branchiommatis
Selenidium brasili
Selenidium cantoui
Selenidium caulleryi
Selenidium cirratuli
Selenidium cometomorpha
Selenidium costatum
Selenidium cruzi
Selenidium curvicollum
Selenidium echinatum
Selenidium fallax
Selenidium fauchaldi
Selenidium flabelligerae
Selenidium filiformis
Selenidium foliatum
Selenidium folium
Selenidium francianum
Selenidium giganteum
Selenidium grassei
Selenidium halteroide
Selenidium hermellae
Selenidium hollandei
Selenidium intraepitheliale
Selenidium mackinnonae
Selenidium martinensis
Selenidium melinnae
Selenidium melongena
Selenidium mercierellae
Selenidium mesnili
Selenidium metchnikovi
Selenidium orientale
Selenidium parvum
Selenidium pendula
Selenidium pennatum
Selenidium pisinnus
Selenidium plicatum
Selenidium polydorae
Selenidium potamillae
Selenidium productum
Selenidium rayi
Selenidium sabellae
Selenidium sabellariae
Selenidium serpulae
Selenidium sipunculi
Selenidium spatulatum
Selenidium spinosis
Selenidium spionis
Selenidium stellatum
Selenidium synaptae
Selenidium telepsavi
Selenidium terebellae
Selenidium virgula

Taxonomy

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This genus was created by Giard in 1884.[1] Fifty six species have been described in this genus.

The type species is Selenidium pendula Giard, 1884.

Description

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All species in this genus infect marine invertebrates.

Life cycle

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These species infect the gut of polychaete worms.

The trophozoites are vermiform with an apical complex. They have few epicytic folds. A dense array of microtubules lies under a trilayered pellicle.

Syzygy occurs in the tail-to-tail, head-to-head and lateral positions.

The gamonts are extracellular. They are foliaceous or cylindroid in shape and have longitudinal striations.

The oocysts are spherical or ovoid, are 12-18 microns in diameter and their wall is 1 micron thick. They have four infective sporozoites each.

The sporozoites undergo schizogony (merogony).

References

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  1. ^ Giard A (1884). Note sur un nouveau groups de protozoaire parasites des annelides et sur q points de l'histoire des gregarines (S. pendija). C r Assoc fr Avnnc Set, Cotigr Blois p. 19