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Cystacanths of <jats:italic>P. rancoensis<\/jats:italic> are described from the dominant freshwater crab <jats:italic>Aegla abtao<\/jats:italic> in Ranco Lake, Chile and are morphologically distinguished from cystacanths of the 9 other species based on a combination of 4 characters. These are body size, number of proboscis hook rows, number of hooks per row, and length of the largest anterior 2\u20134 hooks. Male and female cystacanths of <jats:italic>P. rancoensis<\/jats:italic> are 2.10\u20133.33 mm long having an ovoid proboscis with 14 rows of 6\u20137 hooks per row, with the largest anterior 2\u20134 hooks being 105\u2013110 micrometers long; the anterior trunk has many small spines in 70\u201380 concentric rings, each with 50\u201360 spines around them; hook roots are simple, directed posteriorly, about as long as the blades anteriorly with unremarkable anterior manubria; the cephalic ganglion are in mid-receptacle just anterior to the level of the anterior trunk; the lemnisci are long and slender; the testes are in the anterior trunk, posterior trunk, or one in each; the primordia of 2 tubular cement glands are evident; strong bundles of fibers link the anterior and posterior trunk; and the posterior trunk has a corrugated surface cuticula. Molecular analysis (COI and 18S) sequences coincided with the morphology and support its taxonomy. The phylogenetic profile revealed that <jats:italic>P. rancoensis<\/jats:italic> n. sp. fell into the <jats:italic>Profilicollis<\/jats:italic> clade. Both sequences showed low genetic variation, and three different haplotypes were found. The new species was more closely related to <jats:italic>P. botulus<\/jats:italic> (Van Cleave, 1916) Witenberg, 1932 than to other <jats:italic>Profilicollis<\/jats:italic> species.<\/jats:p>","DOI":"10.1051\/parasite\/2023042","type":"journal-article","created":{"date-parts":[[2023,10,19]],"date-time":"2023-10-19T08:24:20Z","timestamp":1697703860000},"page":"42","source":"Crossref","is-referenced-by-count":8,"title":["Review of the concept of <i>Profilicollis<\/i> Meyer, 1931 with a description of <i>Profilicollis rancoensis<\/i> n. sp. 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