Thyonidae Panning, 1949

Solis-Marin, Francisco Alonso, Alvarado, Juan Jose, Conejeros-Vargas, Carlos Andres & Caballero-Ochoa, Andrea Alejandra, 2020, Pentamera fonsecae n. sp. a new species of sea cucumber from the Pacific coast of Costa Rica (Holothuroidea: Dendrochirotida: Thyonidae), Zootaxa 4878 (3), pp. 581-588 : 582

Family Thyonidae Panning, 1949 (sensu Smirnov 2012)

Diagnosis. Dendrochirotida with 10–20 tentacles. Tube feet scattered all over body or restricted to the radii. Calcareous ring segmented. Ring often tubular, forked processes of radial segments long, prominent. Interradial segments often strongly elongated basally fused with processes of radial segments; both calcareous ring segments, and processes subdivided into many pieces. Ossicles: tables with two or four pillars and/or plates; sometimes baskets present (modified from Smirnov 2012).