Family Actisecidae Harmer, 1957

Canu and Bassler (1929) described Exechonella discoidea as a new species from Philippines with umbonuloid frontal shield being very similar to that in Exechonella . Presence of the ovicells, however, does not allow its attribution to this genus. Earlier from the same area these authors described another cheilostome with similar frontal shield as Actisecos regularis Canu & Bassler, 1927 (also described in their 1929 paper). The latter species was redescribed by Harmer (1957), based on the specimens from Indonesia and New Guinea. This author has also introduced the family Actisecidae . To avoid confusions with exechonellid species in the future, we studied and redescribed the specimens of Canu and Bassler.