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
Three new species of Rockacestus Caira, Bueno & 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....
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Published in | Zoosystematics and Evolution Vol. 100; no. 2; pp. 357 - 372 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Sophia
Pensoft Publishers
03.04.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Three new species of
Rockacestus
Caira, Bueno & 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. |
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ISSN: | 1435-1935 1860-0743 |
DOI: | 10.3897/zse.100.117956 |