Catophragmus pilsbryi Broch, 1922 Catolasmus is one of two monotypic Catophragmid acorn barnacle genera recognized in the Northern Hemisphere.

Catolasmus represents one of the relictual lineages of the basal balanomorph radiation.

There are eight primary wall plates, with the rostrolatus entering the sheath, and free from the adjacent rostrum.

Catolasmus pilsbryi is a lower littoral species found on the Pacific Coast of Panama and Costa Rica.

[3]: 63  Ross & Newman, 2001,[1]: 81  further stated a preference for vertical surfaces in the lower intertidal and subtidal habitats.