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- Title
Systematics and phylogeny of Potamotrygonocestus (Platyhelminthes, Tetraphyllidea, Onchobothriidae) with descriptions of three new species from freshwater potamotrygonids (Myliobatoidei, Potamotrygonidae).
- Authors
Marques, Fernando P. L.; Brooks, Daniel R.; Araújo, Maria L. G.
- Abstract
Specimens of Potamotrygonocestus used in the present taxonomic and phylogenetic study were collected in freshwater potamotrygonids from the Rio Paraná (Puerto Reconquista, Santa Fé, Argentina; 59°42′W, 29°29′S) during February 1995, and from the Amazon region of Brazil during September to December 1996, supplemented by specimens previously deposited in museum collections. Six species of Potamotrygonocestus were recognized (P . amazonensis , P . chaoi sp. n., P . fitzgeraldae sp. n., P . magdalenensis , P . maurae sp. n., P . travassosi ), for which an identification key is provided. Potamotrygonocestus orinocoensis is considered a junior synonym of P . travassosi . Additional specimens of Potamotrygonocestus may represent two undescribed species. A phylogenetic analysis of six morphological characters for the six named species of Potamotrygonocestus generated a single tree eight steps long, with a consistency index of 0.87, a retention index of 0.90, and a rescaled consistency index of 0.79 with the following topology: (P . maurae sp. n. ((P . amazonensis + P . magdalenensis ) (P . chaoi sp. n. (P . fitzgeraldae sp. n. + P . travassosi )))).
- Subjects
PHYLOGENY; PLATYHELMINTHES; TETRAPHYLLIDEA; FRESHWATER stingrays
- Publication
Zoologica Scripta, 2003, Vol 32, Issue 4, p367
- ISSN
0300-3256
- Publication type
Article
- DOI
10.1046/j.1463-6409.2003.00111.x