Meroselenidium
| Meroselenidium | |
|---|---|
| Scientific classification | |
| Domain: | Eukaryota |
| (unranked): | Sar |
| (unranked): | Alveolata |
| Phylum: | Apicomplexa |
| Class: | Conoidasida |
| Subclass: | Gregarinasina |
| Order: | Archigregarinorida |
| Family: | Selenidioididae |
| Genus: | Meroselenidium |
| Species | |
|
Meroselenidium keilini | |
The Meroselenidium are a genus of parasitic protozoa in the phylum Apicomplexa. Species in this genus infect marine invertebrates.
Taxonomy
This genus was described by Mackinnon and Ray in 1933. There is one species in this genus - Meroselenidium keilini.
Description
The trophozoites live within the gut lumen. They measure 200-300 µm × 40-70 µm. There are 30-40 grooves along the body. Four refringent rods are present in the mucron. A vacuole may also be present in the mucron.
Schizogony occurs in the intestinal epithelium and gives rise to multiple merozoites.
Synergy is caudo-caudal. The gametocysts are 70 µm × 55 µm and give rise to multiple gametes. After fertilization the zygote gives rise to ~20 sporocysts. There is no residual body. The sporocysts are bivalved and give rise to multiple sporozoites.
Life cycle
This species infects the anterior intestine of the polychaete Potamilla reniformis.
The parasite infects the gastrointestinal tract and is presumably transmitted by the orofaecal route but the details of this mechanism are presently unknown.