Pharyngobranchial cartilage which forms in close proximity to or fused with pharyngobranchial 3; may not be distinguishable as a separate element in the adult. Remains cartilaginous. [ ORCiD:0000-0001-9114-8737 GOC:mh http://zfin.org/ZDB-PUB-961014-192 ]
Synonyms: infrapharyngobranchials infrapharyngobranchial 4 cartilage