Helminth parasite larvae collected from Arabian Gulf fish III. first report on genus Dasyrhynchs Pintner 1928 (Cestoda: Trypanorhyncha) with a key depending on morphology of plerocercoid larva

Abstract

Two trypanorhynchan cestode larvae related to genus Dasyrhynchus are reported for the first time from Emirati coastal waters, Arabian Gulf. The first is Dasyhynchus sp. collected as encysted. larvae from body cavity of Argyrops filamentousus and lethrinus kallopterus. The second is D. magnus which infects Parupeneus pleurotoneia at the same location. The two specimens are the only Dasyrhanchisds which have relatively short bullbs and anteriorly straight sheaths. Dasyrhynchus sp. Is characterized by single chainette rather than double with a peculiar bi-winged elements while D. magnus has a double chainette and bulbs which clearly projecting into Pars proliferaus. A key is proposed depending mainly on scolex morphology and armature pattern to distinguish between the different valid species of genus.