Amphilimnidae, O'Hara, Stöhr, Hugall, Thuy & Martynov, 2018

Stöhr, Sabine, Hugall, Andrew F., Thuy, Ben & Martynov, Alexander, 2018, Morphological diagnoses of higher taxa in Ophiuroidea (Echinodermata) in support of a new classification, European Journal of Taxonomy 416, pp. 1-35 : 19

Family Amphilimnidae fam. nov. urn:lsid:zoobank.org:act:304D30DE-9638-47B8-9AD4-CD1DB5AEDFD4

Type genus

Amphilimna Verrill, 1899a (type species: A. olivacea ( Lyman, 1869)) .

Diagnosis

Dorsal disc fully scaled, with rod-like smooth spines. Arm spines inside disc modified, large, flat scalelike. Long, spiniform tentacle scales. Abradial genital plate twisted. Tooth sockets round with indistinct borders, not perforating. Arm spine articulations with two smooth, parallel ridges, in the proximal space between them a short ridge (absent in some species). Inner side of lateral arm plates with two merged knobs instead of a ridge. Ventral arm plate with spur on the proximal edge.