Synaptina Al. Smirnov, 1998

Smirnov, Alexey V., Panina, Elena G., Sanamyan, Nadezhda P. & Sanamyan, Karen E., 2017, ScoliorhAPis stEPAnovi - new species of sea cucumber from the North-West Pacific (Holothuroidea: Synaptida: Chiridotidae: Taeniogyrinae) and some remarks on the genus ScoliorhAPis, Zootaxa 4337 (4), pp. 563-572 : 564

Suborder Synaptina Al. Smirnov, 1998

Diagnosis (after Smirnov, 2012). Segments of calcareous ring lacking large anterior processes; excavations for tentacular ampullae occurring on the external side of the ring. Madreporite is situated at the end of а long stone canal far from the ambulacral ring. Ciliated funnels present. One to many Polian vesicles. Five pairs of statocysts located at the place where radial nerves extend from the neural ring. Ossicles: chiridotid wheels and/or sigmoids or anchors and anchor plates; wheels of larvae and juveniles with flat hub and large number of spokes.