part of part of anatomical cluster caudal-fin ray pump This class was sourced from an external ontology (teleost_anatomy). Its definitions, naming conventions and relationships may need to be checked for compatibility with uberon Anatomical cluster that consists of thickened caudal-fin rays modified into a pumping mechanism associated with the caudal-fin organ. UBERON:2002126 Caudal fin rays can vary in thickness and form of the pump can vary from a simple open groove to complex chambered structure. Definition reference: Weitzman SH, Menezes NA. 1998. Relationships of the tribes and genera of the Glandulocaudiinae (Ostariophysi: Characiformes: Characidae), with a description of a new genus. In: Malabarba LR, Reis RE, Vari RP, Lucena ZMS, Lucena CAS, editors. Phylogeny and Classification of Neotropical Fishes. Porto Alegre: EDIPUCRS. p 171-192. caudal fin