The generic diagnosis of Pavanelliella (Monogenoidea: Dactylogyridae) is emended to include species with rounded, cephalic margins and well-developed haptors set off from the trunk by a peduncle. Pavanelliella scaphiocotylus sp. nov. is described from the nasal cavity of the Guatemalan chulin, Rhamdia guatemalensis (Heptapteridae), from Ixin-há Cenote, Yucatán, Mexico. The new species differs from its congener, Pavanelliella pavanellii, in possessing a well-developed haptor and peduncle, a coiled male copulatory organ comprising 5–6 counterclockwise rings, and a vaginal canal with 4–5 loops.
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