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    • The geographic distribution of Costa Rican velvet worms (Onychophora: Peripatidae) 

      Barquero González, José Pablo; Cabrera Alvarado, Adrián Alonso; Valle - Cubero, Stephanie; Monge Nájera, Julián; Morera, Bernal (Revista de Biologia Tropical vol.64 no.4 1401-1414 2016, 2016-06-06)
      Velvet worms, “peripatus” or onychophorans, are “living fossils” that were geographically widespread in Cambrian seas but now occur exclusively on terrestrial habitats. The only extant species studied in some detail are ...