Abstract
The present study describes Tereancistrum flabellum n. sp. (Dactylogyridae, Ancyrocephalinae) from the gills of the anostomid fishes Leporinus friderici, Leporinus amblyrhynchus and Leporinus elongatus from two freshwater ecosystems in the south east of Brazil. This new species is mainly characterized by the morphology of the copulatory complex (such as the MCO base formed by two fan-shaped structures, and accessory piece flattened, curved, rigid and channeled), a dorsal anchor with a well-developed superficial and inconspicuous deep root, and the shape of the accessory anchor sclerite with small spathulate termination. Tereancistrum flabellum n. sp. is the first record of a dactylogyrid from L. amblyrhynchus. The description of Tereancistrum parvus is also emended to correct and complement previous descriptions and the species is reported for the first time in Schizodon nasutus.
Highlights
The Anostomidae Günther, 1864 family includes fish species that are widely distributed from southern Central America to tropical and subtemperate regions of South America (Nelson 2006)
Twenty-four specimens of L. amblyrhynchus, 22 of L. elongatus, 40 of L. friderici, and 40 of S. nasutus were collected from the Sapucaí-Mirim River, São Paulo state, Brazil (20°26’12.5”S, 47°53’18.59”W) between March 2012 and July 2013, while 116 specimens of L. friderici were captured from the Jurumirim Reservoir, São Paulo state, Brazil (23°12’17’’S, 49°13’19’’W) between April 2011 and July 2012
Among the nine species of Tereancistrum described to date, only three were found parasitizing anostomid fishes, such as T. parvus, which were reported in L. fasciatus (Kritsky et al 1980), Leporinus lacustris (Amaral Campos, 1945), Leporinus obtusidens Valenciennes, 1847 (Guidelli et al 2011), S. borellii (Karling et al 2014), and L. friderici, L. elongatus, and S. nasutus; T. paranaensis in S. borellii (Karling et al 2014), L. obtusidens (Wendt et al 2015) and Schizodon intermedius Garavello and Britski, 1990 (Abdallah et al 2016), and T. flabellum n. sp., reported in L. friderici, L. elongatus and L. amblyrhynchus
Summary
The Anostomidae Günther, 1864 family includes fish species that are widely distributed from southern Central America to tropical and subtemperate regions of South America (Nelson 2006). Some larger members of Leporinus and Schizodon are known for their spawn migrations in the Paraná-Paraguay river system and in the Amazon and Orinoco basins. Because of their annual migrations, these species are subjected to significant exploitation by commercial and subsistence fisheries as an important food source for the people of South America (Garavello and Britski 2003). Dactylogyridae Bychowsky, 1933 is the most abundant taxon in South America, and included in this family is Tereancistrum Kritsky, Thatcher and Kayton, 1980, which accommodates parasites of characiform fishes in the Neotropical region (Thatcher 2006)
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