Type Species: Balanus radiata Bruguiere, 1789, OD (Ross, 1969:242).
Type Locality: unknown, living.
Diagnosis: "Orifice occluded in part by scutum and by apical portion (occludent margin) of tergum; scutum wider than high, rostral depressor muscle crests absent; occludent margin with 5 or more, small, oblique teeth; articular ridge of tergum substantially overlying apical portion of scutum; intromittant organ lacking basi-dorsal point" (after Ross and Perreault, 1999:2).
Comments: Shell and opercular plates are essentially unpigmented. Three species are assigned by Ross and Perreault;N. radiata (Bruguiere, 1789),N. hentscheli (Kolosvary, 1942), andN. kolosvaryi Ross and Perreault, 1999. A possible undescribed species was noted by Spivey, 1976, from Fort Randolph, Panama.