Dendrochirus lionfishes are characterised by typically having 13 spines and 9 or 10 soft rays in the dorsal fin and 3 spines and 5 or 6 soft rays in the anal fin. The spines on the parietal bon are not high and the lower jaw has no ridges, spines or scales.
Dendrochirus lionfishes have a unique fin structure with specific numbers of spines and soft rays: 13 spines and either 9 or 10 in their dorsal fin, and 3 spines and either 5 or 6 in their anal fin. The parietal bon's spines are not high, and the lower jaw lacks ridges, spines, or scales.