Synallactida
{{Short description|Clade of sea cucumbers}}
{{Automatic taxobox
| image = Three-Rowed Sea Cucumber.jpg
| image_caption = Isostichopus badionotus, in family Stichopodidae
| taxon = Synallactida
| authority = Miller, Kerr, Paulay, Reich, Wilson, Carvajal & Rouse, 2017
| subdivision = See text
}}
Synallactida is a rankless clade of sea cucumbers, but is referred to as an order.{{cite WoRMS |author=Paulay, Gustav |year=2017 |title=Synallactida |id=1036229 |accessdate=2017-11-29}} Taxa within Synallactida were previously classified in an order called Aspidochirotida, which was determined to be polyphyletic in 2017.{{cite WoRMS |author=Paulay, Gustav |year=2017 |title=Aspidochirotida |id=123109 |accessdate=2017-11-29 }}
List of families
Synallactida includes over 130 species in three extant families and two extinct genera:{{Cite web|title=WoRMS - World Register of Marine Species|url=http://www.marinespecies.org/aphia.php?p=browser&accepted=1&id%5B%5D=1393249&id%5B%5D=1036229#focus|access-date=2020-12-15|website=www.marinespecies.org}}
- Deimatidae Théel, 1882 – 3 genera
- Stichopodidae Haeckel, 1896 – 9 genera
- Synallactidae Ludwig, 1894 – 12 genera
- Genus †Collbatothuria Smith & Gallemí, 1991
- Genus †Tribrachiodemas Reich, 2010
Image:Parastichopus californicus.jpg|Apostichopus californicus
Image:Australostichopus mollis P1222859.JPG|Australostichopus mollis
Image:Isostichopus badionotus.jpg|Isostichopus badionotus
Image:Stichopus chloronotus Réunion.jpg|Stichopus chloronotus
Image:Stichopus sp.png|Isostichopus fuscus
Image:Thelenota anax.jpg|Thelenota anax