Cladus: Eukaryota Hassar is a genus of catfishes (order Siluriformes) of the family Doradidae. It includes three species, H. affinis, H. orestis, and H. wilderi.[1] Taxonomy Hassar was described by Carl H. Eigenmann and Rosa Smith Eigenmann in 1888 with Oxydoras orestis as the type species.[1] Hassar is a more derived genus within the family and is classified in the subfamily Doradinae.[2] Distribution Hassar species are distributed in South America. H. affinis originates from the Parnaíba River basin.[3] H. orestis is found in the Amazon, Orinoco and Essequibo River basins.[4] H. wilderi inhabits the Tocantins River basin.[5] Description Like other doradids, Hassar species have a row of scutes on each side of their body, though they are more subdued.[6] Hassar species grow to approximately 20–25 centimetres (8–10 in) SL.[3][4][5] In the aquarium Hassar species are very rarely imported for the aquarium hobby, and the most commonly imported species is H. orestis. Care of this species is not straightforward; they are hard to acclimate if not in good condition at the point of sale. They are always wild caught. However, once settled in they are easier to care for. These fish should be provided with dense vegetation to feel comfortable. They are not aggressive, though smaller fish are very shy in the presence of larger fish.[6] References 1. ^ a b Ferraris, Carl J., Jr. (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa 1418: 1–628. http://silurus.acnatsci.org/ACSI/library/biblios/2007_Ferraris_Catfish_Checklist.pdf.
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