Molecular Biology and Genetics
Statistics of barcoding coverage
Specimens with Sequences:137
Specimens with Barcodes:125
Species With Barcodes:3
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.
The following three genera are recognised by the World Register of Marine Species (WoRMS): 
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