Family PYRGOMATIDAE Gray, 1825

Balanidae Leach, 1817: 68 (part.). - Darwin 1854: 33 (part.).

Balaninae . - Nilsson-Cantell, 1921: 306 (part.).

Pyrgomatidae Gray, 1825: 102. - Newman 1996: 503.

Pyrgomatinae . - Ross & Newman, 1973: 149.

Diagnosis.

Wall of four plates wholly concrescent; parietes solid or tubiferous; when tubiferous, tubes occur between outer lamina and sheath or between external ribs of wall; interlaminate figures complex, essentially arborescent; radii solid; basis calcareous, rarely tubiferous, membranous in Pyrgopsella .