Marine cestodes from teleosts and elasmobranchs off Argentina: done, doing, to do.

VERÓNICA A. IVANOV; ADRIANA MENORET

Rostock

Workshop; IX Workshop for Cestode Systematic and Phylogeny; 2017

University of Rostock, Alemania

During the last decadeextensive field work in search for marine cestodes has been carried out alongthe coast of Argentina, from shallow waters to deep sea (15-1,500 m depth).More than 80 species of teleosts, and 40 species of elasmobranchs (Rajiformes, Torpediniformes,Myliobatiformes, Carcharhiniformes, Hexanchiformes, Squaliformes andSquatiniformes). Among them, 20 species of elasmobranchs had not beenpreviously examined for cestodes, and 15 are endemic to the SouthwesternAtlantic. So far 68 species of tapeworms have been identified, including 23species recently described and 36 putative new species. They represent 28genera (at least 3 are new genera) in Bothriocephalidea, Cathetocephalidea,Diphyllidea, Lecanicephalidea, Onchoproteocephalidea, Phyllobothriidea,Rhinebothriidea, Tetraphyllidea and Trypanorhyncha. Also transmission pathwayshave been described, in part, for 4 species of trypanorhynchs, and interestingbiogeographic patterns in hosts and parasites distribution have been observed.Besides documenting and describing host and parasite diversity, we also exploreother aspects of this system. Recently, ultraestructuralinvestigations using transmission electron microscopy and histochemistry havebeen done on selected taxa, in search of a better understanding of the internalmorphology of the different types of microtriches and structures related to thescolex. This information might be useful for the recognition of morphologicalsynapomorphies to support the tapeworm orders recently proposed. The purpose ofthis presentation is to show some preliminary results and future work in ourlab.