pectoral fin spine 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 UBERON:2001787 pectoral spine Pectoral-fin lepidotrichium 1 with mostly co-ossified and unsegmented hemitrichia that form a stiff and usually thick shaft and enlarged basal processes that moveably articulate with the pectoral girdle. The pectoral fin spine may also result from the fusion of several lepidotrichia that form a stiff shaft. pectoral fin lepidotrichium paired fin spine