Sekundäre Weichbodenbewohner unter den Cirripediern

For various reasons, but mainly because of reproductional constraints, cirriped arthropods have evolved less secondary soft bottom dwellers than other sessile groups of organisms. Presented examples are (1) a modern balanid that lives commensally on a small burrowing bivalve and (2) the Cretaceoous /EoceneWaiparaconus, wich is re-established as a lepadomorph whose peduncle has become transformed into a solid, horn shaped anchoring device.