Trypanorhynchs from elamsobranchs in the Warm Temperate Southwestern Atlantic and magellanic Provinces

IVANOV, V. A.; MENORET, A.

Rostock

Workshop; IX Workshop for Cestode Systematic and Phylogeny; 2017

University of Rostock, Alemania

Trypanorhynchs arewell represented in the Temperate South America Realm, with a total of 29 speciesdescribed from adults in 17 genera, recovered from sharks and batoids along theWarm Temperature Southwestern Atlantic Province (WTSWA) and the MagellanicProvince (MA). Most species (14) are cosmopolitan or have a wide distribution,and infect hosts with oceanic or circumglobal distribution. Five species are restrictedto the WTSWA (i.e., Heteronybeliniamattisi, Dollfusiella acuta, Dollfusiella taminii, Grillotia carvajalregorum and Parachristianella damiani), and 4species were only found in the MA (i.e., Prochristianellaheteroacantha, Dollfusiella musteli,Mecistobothrium oblongum and Grillotia patagonica). Dollfusiella vooremi was found in bothregions. In general, all the species follow the range of distribution of theirrespective hosts. Exceptions to this pattern are G. patagonica, P. damiani and M. oblongum, which are restricted to aparticular biogeographic province, regardless their respective hosts have awider distribution. Grillotia patagonicais only found in the Patagonian shelf (MA), while its host, Psammobatis rudis, has a widerdistribution up to warmer waters. Despite the wide distribution of Myliobatisgoodei along the western Atlantic, the specimens show locally distinctivecestode faunas, which are correlated with well-defined biogeographic regions(i.e., P. damiani in WTSWA and M. oblongum in MA). A similar patternhas been observed in the same host and lecanicephalidean cestodes.