AI Article Synopsis
- * The nymph was identified as likely belonging to the genus Diesingia, showing distinct morphological features and differing from other related genera, while genetic analysis placed it as a sister group to Alofia sp.
- * The findings suggest that without further reliable descriptions or linking sequences between nymphs and adults, the classification as Diesingia sp. remains tentative, and there is a possibility of discovering a new genus; additionally, the study discusses the classification of Sebek
Article Abstract
During a search for parasites in fishes from Iguazu River, Argentina, a nymph of pentastomid was found encysted on mesenteries of Phalloceros harpagos. The 28S rDNA and COI mt-DNA were used to compare with the sequences deposited in the GenBank. Pentastomid nymphs belong to the subfamily Diesingiinae (Sebekidae) for having chloride cell pores distributed in a single row per annulus; also, the hooks and rows of spines of our material differ to other genera. Present specimens are most likely Diesingia sp., having 63-74 annuli, a U shaped oral cadre with fibers closing anteriorly and a peg like extension of the oral cadre. The 28S rDNA analysis places our samples into a sister group of Alofia sp., but the COI mt-DNA situate them on the base of the clade. In conclusion, our pentastomid positively belongs to Diesingia sp., however, indisputable assignation requires a reliable description of the nymph, or the availability of sequences linking nymphs and adults, which even could provide evidence of a new hitherto undescribed genus. Aditionally, the systematic position of Sebekia oxycephala previously described by P. harpagos is discussed on the basis of our results, allowing us to suggest a re-assignation of such specimens to the genus Diesingia.
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| http://dx.doi.org/10.1590/0001-3765202320200668 | DOI Listing |
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