Synallactida

Synallactida is a rankless clade of sea cucumbers, but is referred to as an order. Taxa within Synallactida were previously classified in an order called Aspidochirotida, which was determined to be polyphyletic in 2017.

List of families

Synallactida includes over 130 species in three extant families and two extinct genera:

Deimatidae Théel, 1882 – 3 genera
Stichopodidae Haeckel, 1896 – 9 genera
Synallactidae Ludwig, 1894 – 12 genera
Genus †Collbatothuria Smith & Gallemí, 1991
Genus †Tribrachiodemas Reich, 2010