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Olivaichthys
viedmensis (MacDonagh, 1931) |
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Image
contributors to this species: |
Karl-Heinz Dau (1
Stamp) |
ScotCat
Sources: |
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Other
Sources: |
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Relevant Information: |
Dorsal spines (total): 2; Dorsal soft
rays (total): 6 - 6; Anal spines: 4 - 5; Anal soft rays: 8 - 11;
Vertebrae: 41 - 43. Six species of Diplomystidae are currently
recognized (Arratia, 1987; Azpelicueta, 1994a-b). Berra (2001)
depicts the family distribution. Half of the species occur west
of the Andes in south central Chile. The trans-Andean species
are D. chilensis from rivers near Valparaíso and
Santiago, D. nahuelbutaensis from the Bío Bío
basin, and D. camposensis from the Valdivia region (Arratia,
1987). Three other species occur east of the Andes in southern
Argentina. Arratia (1987) erected the genus Olivaichthys
for the Argentinian specimens and Lundberg, et al (2004) follow
Azpelicueta (1994a-b) and most subsequent authors who treat Olivaichthys
as a synonym of Diplomystes. The cis-Andean species are
O. viedmensis from the Río Negro system, O.
cuyanus from the Río Colorado and the Desaguadero-Salado
basin, and O. mesembrinus known only from relatively
few specimens from Chubut and Senguerr rivers (Azpelicueta, 1994a-b).
Olivaichthys viedmensis has been taken from rivers
near sea level to about 1,900 m (Azpelicueta, 1994a). Diplomystids
are generalized carnivores that consume annelids, mollusks, and
arthropods (Arratia, 1987; Azpelicueta & Gosztonyi, 1998).
Note: Fishbase and the
All Catfish Species Inventory go with Arratia (1987) and
name this species as Olivaichthys viedmensis. |
Common
Name: |
Otuno |
Synonyms: |
Diplomystes viedmensis |
Family: |
Diplomystidaemblycipitidae |
Distribution: |
South America: Negro
River and tributaries in Argentina. Type locality:
Río Negro, Argentina, frente a Viedma. |
Size:
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32.5cm. (13ins) |
Temp: |
20-24°C
(67-75°f.) |
p.H. |
6.0 -7.0. |
Reference: |
Lundberg, J.G., T.M. Berra
and J.P. Friel 2004 First description of small juveniles
of the primitive catfish Diplomystes (Siluriformes: Diplomystidae).
Ichthyol. Explor. Freshwat. 15(1): 71-82.
Froese, R. and D. Pauly. Editors. 2009.FishBase.
World Wide Web electronic publication. www.fishbase.org, version
(09/2010). |
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