Body without scales and elongated, smooth skin with
short papillae. The size of the eye is small. It has
a pair of maxillary barbels, the nasal openings are
surrounded by a fold of posterior skin. Vomerian teeth
short, wide and conical. The second dorsal fin is
adipose and is inserted at the end of the base of
the anal fin. The first dorsal and the pectorals contain
an ossified radius, pointed at its distal end and
with dentate posterior margin. The pectoral fin also
has a spine, the pelvic fins are in an abdominal position
and the caudal atheta is slightly furcated, with two
well-marked lobes. Colouration: The
colour it presents is on the back of the head and
dark trunk, violet or blackish, flanks and orange
ventral part. (Arratia, 1987). Habitat:
D. nahuelbutaensis is an endemic species of Chile,
with reduced abundance. Background on their biology
indicate that there is a separation between juveniles
and adults in terms of habitat, because adults live
in more torrential and deep waters, while juveniles
are associated with preferably less torrential riparian
areas, have also been described in environments of
ritron, mainly in areas of deep pools with benthos,
substrates of gravel to boulders with low temperatures
and high oxygenation (Habit, 1994). Remarks:
The present study, therefore, represent the rediscovery
of diplomystids from coastal basins after a century
(since 1919) and first records in the Laraquete and
Carampangue basins (Muñoz-Ramírez CP.et.al. 2020).
America: Bío-Bío River basin
and Loncomilla River in Chile.
Arratia G, Quezada-Romegialli
C. (2017) Understanding morphological variability
in a taxonomic context in Chilean diplomystids (Teleostei:
Siluriformes), including the description of a new
species. Froese, R. and D. Pauly. Editors.
2018. FishBase. World Wide Web electronic publication.
www.fishbase.org, ( 06/2018 ).
de Pinna, M.C.C., 1998. Phylogenetic relationships
of neotropical Siluriformes (Teleostei: Ostariophysi):
historical overview and synthesis of hypotheses. p.
279-330. In L.R. Malabarba, R.E. Reis, R.P. Vari,
Z.M.S. Lucena and C.A.S. Lucena (eds.) Phylogeny and
classification of neotropical fishes. Porto Alegre:
EDIPUCRS. Muñoz-Ramírez CP, Briones R,
Colin N, Fierro P, Górski K, Jara A, Manosalva
A. A Century after! Rediscovery of the ancient
catfish Diplomystes Bleeker 1858 (Siluriformes: Diplomystidae)
in coastal river basins of Chile and its implications
for conservation. Neotrop Ichthyol. 2020; 18(1):e190073.