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Arratia G, Quezada-Romegialli C. 2017 (1) Iván Valdebenito Isler (3)

Description: The maximum known length, at the adult stage, is 249 mm (Arratia, 1987). These fish have moderately elongated body and no scales. It has barbs nasales and suprapreoperculares. Premaxillary length less than 50% of maxillary length with 12 to 19 teeth. Palatine elevator crest poorly developed. More than 52 radii in the caudal fin. Nasal openings rounded by a long fold of skin, a fold completely covering the posterior opening. Numerous, short and rounded papillae throughout the body including lips and gill membranes, the papillae are thin and sharp on the maxillary chin. With short papillae on the roof and floor of the mouth, for the sense of taste. Origin of the dorsal fin closer to half the length of the body than the snout. The dorsal fin has two spines and seven branched and segmented rays, the first spine in juveniles and adults is short and covered by the foot , it is commonly not very noticeable, the second spine is long and strong. The origin of the pelvic fins is later than half the standard length. The pectoral fin is longer in the juveniles than in the adults, the end of the pelvics reaches the origin of the anal in juveniles and separates during growth; both pelvic fins are closer together in the juveniles than in the adults. The anal fin contains simple rays and 8 to 11 main rays. All the fins are markedly fleshy (Arratia, 1987). Colouration: D. camposensis has a uniform dark chestnut or dark purple colouration on the back, with irregular brown or purple spots (rounded) on the flanks. In fresh specimens the belly acquires yellowish, orange or whitish tones. This colouration is variable with age and may differ depending on the location (Arratia, 1987). Habitat: The habitat of this species is not well known and information on reproductive periods, spawning and feeding sites is lacking. However, there should not be much difference with the other diplomats in these aspects (Arratia, 1987). For other species of the genus, juvenile specimens (from 30 to 120 mm of total length) are found in torrent zones in rivers (ritrón) , while adults (which measure about 120 mm in total length ) they prefer the deep zones or bentos of the Potamon (Arratia, 1983). D. Camposensis It is not only found in rivers but also in lakes. Diet: The adult diet of Diplomystes seems to be exclusively carnivorous, based on crustaceans of the genus Aegla , larvae and adults of insects and annelids (Arratia, 1987).

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Diplomystidae

South America: Valdivia region, southern Chile.

20.0cm (8ins)

20-24°C (67-75°f.)

6.0-7.0.

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.