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Two New Species of Tetraphyllidean Cestodes in Himantura pacifica (Chondrichthyes: Myliobatiformes: Dasyatididae) from the Northwest Coast of Costa Rica

Fernando Marques, Daniel R. Brooks and Helena Molina Ureña
The Journal of Parasitology
Vol. 82, No. 2 (Apr., 1996), pp. 302-306
DOI: 10.2307/3284165
Stable URL: http://www.jstor.org/stable/3284165
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Two New Species of Tetraphyllidean Cestodes in Himantura pacifica (Chondrichthyes: Myliobatiformes: Dasyatididae) from the Northwest Coast of Costa Rica
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Abstract

Two new species of tetraphyllidean cestodes inhabiting Himantura pacifica from the northwest coast of Costa Rica are apparently most closely related to species inhabiting Himantura schmardae from the Atlantic coast of Colombia. Acanthobothroides pacificus n. sp. differs from Acanthobothroides thorsoni, the only other species in the genus, primarily by having smaller lateral (98-123 µm rather than 168-198 µm long) and medial (handles 92-116 µm rather than 162-168 µm long) hooks, and more testes (up to 125 rather than up to 97) per proglottis. The generic diagnosis of Acanthobothroides is modified to include the presence of a small inner prong on the large medial bothridial hooks. Rhinebothrium geminum n. sp. and Rhinebothrium magniphallum are the only 2 species in the genus possessing unusually long cirrus sacs, extending from the genital atrium all the way to the ovarian isthmus; R. geminum averages 12 (12-14) loculi per bothridium and 11 (9-12) testes, whereas R. magniphallum averages 17 (16-18) loculi and 14 (10-16) testes per proglottis.

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