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Scientific classification
Domain: Eukaryota
(unranked): Sar
(unranked): Alveolata
Phylum: Apicomplexa
Class: Conoidasida
Subclass: Gregarinasina
Order: Archigregarinorida
Family: Selenidioididae
Genus: Merogregarina

Merogregarina amaroucii

Merogregarina is a genus of parasitic alveolate in the phylum Apicomplexa. Species in this genus infect marine invertebrates.


This species was described in 1908 by Porter.[1]

There is one species in this genus - Merogregarina amaroucii.


The trophozoites are found in the intestinal lumen. They measure 23-31 microns x 11-15 microns. They are initially ovoid and become vermiform as they mature. The single nucleus lies at the anterior end and has one nucleolus.

The trophozoites develop in multinucleated schizonts which give rise to 8-20 merozoites. The merozoites are 5-6 microns x 1 micron.

The sporocysts give rise to eight sporozoites.

Life cycle[edit]

This species is found in species of the ascidian genus Amaroucium.

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

Schizogony is intracellular.


  1. ^ Porter (1908) A new Schizogregarine, Merogregarina amaroucii nov.gen., nov. sp., parasitic in the alimentary canal of the composite Ascidian, Amaroucium sp. (Prel. Comm.). Archives de Zoologie Paris (Ser 4) 9 (xliv-xlviii)