Metridiidae

Metridiidae
Metridium senile
Scientific classification
Kingdom:	Animalia
Phylum:	Cnidaria
Class:	Anthozoa
Subclass:	Hexacorallia
Order:	Actiniaria
Family:	Metridiidae Carlgren, 1893 [1]

Metridiidae is a family of sea anemones in the order Actiniaria.^[2]

Characteristics

Members of the family Metridiidae are characterised by having a mesogloeal sphincter muscle and by the mesenterial arrangement, with the mesenteries not being divided into macronemes and microcnemes. The acontia typically have microbasic b-mastigophors and microbasic amastigophors, though the latter are not always present in adults.^[1]

Genera

The following three genera are recognised by the World Register of Marine Species (WoRMS): ^[2]

• Isometridium
• Metridium - de Blainville, 1824
• Paraisometridium

Of these genera, Metridium is the most speciose while Isometridium and Paraisometridium are monotypic taxa.

References

1. ^ ^{a b} Metridiidae KU Natural History Museum. Retrieved 2011-08-05.
2. ^ ^{a b} Metridiidae World Register of Marine Species. Retrieved 2011-08-05.