ORYGMATOBOTHRIUM SPP. (CESTODA: TETRAPHYLLIDEA) FROM TRIAKID SHARKS IN ARGENTINA: REDESCRIPTION OF O
June 27th, 2008 | by admin |ORYGMATOBOTHRIUM SPP. (CESTODA: TETRAPHYLLIDEA) FROM TRIAKID SHARKS IN ARGENTINA: REDESCRIPTION OF ORYGMATOBOTHRIUM SCHMITTII AND DESCRIPTION OF A NEW SPECIES.
Two species of Orygmatobothrium were found inhabiting triakid sharks from the coast of Buenos Aires Province, Argentina. Orygmatobothrium schmittii from Mustelus schmitti is redescribed, including new information on the microthrix pattern. Orygmatobothrium juani n. sp. from Mustelus fasciatus can be distinguished from all other species in the genus by the following combination of characters: worm length, number of proglottids, number of testes, testes distribution, size and shape of eggs having ornamented shell, shape of bothridial cleft at level of the marginal accessory sucker, and extension of vitelline follicles. Species in Orygmatobothrium share a common microthrix pattern with the distal bothridial surface covered with maisiform microtriches interspersed with filiform microtriches, proximal bothridial surface covered with trifid microtriches with medial projection conspicuously larger than lateral basal projections interspersed with filiform microtriches, inner and outer surface of accessory sucker and glandulo-muscular organ covered with short filiform microtriches, scolex proper and cephalic peduncle surface covered with blade-like microtriches, germinative zone and entire strobila covered with scutes formed by densely packed filiform. This general configuration is basically similar to the microthrix pattern described in species of Orectolobicestus and Paraorygmatobothrium.
Ivanov V.