Barnacles of the genus Heteralepas (Thecostraca, Cirripedia, Thoracica) from the Canary Islands and the Azores. Description of mantle ultrastructure

Three species of the genus Heteralepas Pilsbry, H. microstoma Gruvel, H. me teorensis Carriol, and H. alboplaculus, were found in surveying materials f rom the Canary Islands and the Azores. Their morphology was described in de tail and compared with earlier descriptions by other specialists. The new s pecies is similar to H. adiposa and H. cygnus, but it differs from them in having numerous small calcareous knobs, four mandible teeth, and a great nu mber of caulad segments. The form of capitulum in H. alboplaculus differs g reatly from that in H. cygnus. The form and distribution of the mantle ultr astructure are also different in the barnacles investigated and may be used in the heteralepadid taxonomy. Functions of some cuticular structures are discussed.