Abstract
Trigonocotyle sexitesticulae sp.nov. is described from specimens collected from pygmy killer whales (Feresa attenuata) in Florida. This species is differentiated from other Trigonocotyle species by the minute overall dimensions of the scolex (372–523 μm wide), strobila (maximum 13.7 mm long in a pregravid specimen), and cirrus sac (40–54 μm in length), an unusual number of testes (6), and the configuration of the scolex and genital atrium. Among other species of Trigonocotyle the dimensions of the scolex, strobila, and cirrus sac far exceed those of T. sexitesticulae, and there are typically > 20 testes in each proglottid. Examination of some specimens of Trigonocotyle globicephalae Baer, 1954 during the present study revealed inconsistencies in previous descriptions with respect to the structure of the scolex, numbers of testes, and dimensions of the cirrus sac. In addition, Trigonocotyle prudhoei Markowski, 1955 appears to represent a composite in which the original description was based on specimens of Trigonocotyle sp. and Strobilocephalus triangularis (Diesing, 1850).
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