Holothuriida

Holothuriida is an order of sea cucumbers. Taxa within the order Holothuriida were previously classified in the order Aspidochirotida, which was determined to be polyphyletic in 2017. Some taxa were also reclassified into the clades Synallactida and Persiculida.

Mesothuriidae is a family of echinoderms belonging to the order Holothuriida.

Mesothuria is a genus of sea cucumbers belonging to the family Mesothuriidae. The genus has a cosmopolitan distribution.

Zygothuria is a genus of sea cucumbers belonging to the family Mesothuriidae. The genus has a cosmopolitan distribution.