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Three new species of    Rockacestus    Caira, Bueno &amp; Jensen, 2021 were recovered from arhynchobatid skates taken between 37°S–55°S in the Magellanic Province, Southwestern Atlantic Ocean.    Rockacestus   blasi    sp. nov.  was found in    Bathyraja   macloviana    (Norman, 1937), whereas    Rockacestus   magellanicus    sp. nov. , and    Rockacestus   ottavianoi    sp. nov.  were found in    Bathyraja   magellanica    (Philippi, 1902). These species differ from their congeners in having a particular combination of anatomical features, including a moderate to highly folded bothridia, presence of a uteroduct, and a seminal receptacle. Cross-sections of mature proglottids were made for the first time in members of the genus. In addition, the microthrix pattern was described in detail, focusing on the distal bothridial surface, including the apical sucker and marginal loculi resulting in a common microthrix configuration with filitriches and small lanceolate, lingulate, and a particular kind of coniform spinitriches. The diagnosis of    Rockacestus    is revised to include several features exhibited by the new species. The distribution data of the species currently assigned to    Rockacestus    are compiled and updated. The finding of    R.   blasi    sp. nov. ,    R.   magellanicus    sp. nov. , and    R.   ottavianoi    sp. nov.  not only increases the number of members of    Rockacestus    in the Magellanic Province in the Southwestern Atlantic from one to four but also expands our knowledge of phyllobothriideans and their association with the softnose skates of the genus    Bathyraja    Ishiyama, 1958 in the Southern Hemisphere.

zoosystematics and evolution

New species of    Rockacestus    (  Cestoda  ,   Phyllobothriidea  ) from skates of the genus    Bathyraja    (  Rajiformes  ,   Arhynchobatidae  ) in the Southwestern Atlantic Ocean with comments on the distribution of the genus