Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Otomorpha
Subcohors: Ostariophysi
Sectio: Otophysa
Ordo: Siluriformes
Familia: Diplomystidae
Genera: Diplomystes - Olivaichthys
Name
Diplomystidae C.H. Eigenmann, 1890
Type genus: Diplomystes Bleeker, 1858
References
Eigenmann, C.H. 1890. The evolution of catfishes. Zoe, A Biological Journal, 1 (1), 10–15.
Ferraris, C.J., jr. 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418: 1–628. Abstract & excerpt PDF (part 1) PDF (part 2) Reference page.
Links
Diplomystidae and its species in FishBase,
Froese, R. & Pauly, D. (eds.) 2024. FishBase. World Wide Web electronic publication, www.fishbase.org, version 02/2024.
Vernacular names
Diplomystidae, the velvet catfishes, are a family of primitive catfishes endemic to freshwater habitats in Argentina and Chile in southern South America. It currently contains six species in two genera.
The earliest known fossils of diplomystids are indeterminate pectoral spines from the Campanian and Maastrichtian of Argentina and Bolivia.[1]
Taxonomy
In traditional schemes, the family Diplomystidae was considered as the basal, primitive sister group to all other catfishes (Siluroidei) on the basis of morphological evidence.[2][3] Almost all molecular estimates of catfish phylogeny, by contrast, find Diplomystidae sister to Siluroidei, with Loricarioidei (the armoured catfish and relatives) the most basal group;[3] though this may be an artifact of rapid evolution in loricarioids.[4]
Diplomystids retain more plesiomorphic characteristics than any other siluriforms, recent or fossil, including aspects of the maxillary bones, barbels, nares, otic capsule, anterior pterygoid bones, Weberian complex centra, caudal skeleton, and fin rays, and pectoral girdle. Monophyly for Diplomystidae is well supported by synapomorphies of the vomerine and palatine shapes, cranial articulation of the hyomandibula, and heavily papillose skin.[5]
Olivaichthys is a genus erected by Gloria Arratia in 1987. However, many recent authors synonymize this genus with Diplomystes.[5] A molecular analysis has proposed that the trans-Andean Diplomystes and the cis-Andean Olivaichthys are so closely related (in addition to the close morphological similarity), that Olivaichthys should not be recognized.[3] However, this is strange, as recent divergence is unlikely with the species on either side of the Andes.[citation needed]
Description
Diplomystids are the only extant catfish family with teeth on a well-developed maxilla (although this is also true of the extinct genus Hypsidoris).[5] Diplomystids possess maxillary barbels. The dorsal and pectoral fins have spines.[2] The largest species reaches 32 cm (13 in).[2]
Ecology
Relatively little is known of the habits and life history of diplomystids. In Chile, diplomystids are mostly found to be benthic in fast-moving streams, and D. camposensis also occurs in lakes. O. viedmensis has been taken from rivers near sea level to about 1,900 m.[5]
Diplomystids are generalized carnivores that consume annelids, mollusks, and arthropods.[5] Specimens of D. nahuelbutaensis from fast-flowing, moderate-elevation (370–520 m) tributaries of the Bío Bío River had eaten aquatic insect larvae, especially chironomids, and the relatively large decapod crustacean Aegla.[5]
Reproduction occurs at least during the austral summer based on captures of females with maturing eggs, and the juveniles reported here were collected in December.[5]
Conservation
All diplomystids are considered to be potentially or actually threatened or endangered due to habitat deterioration and predation or competition by introduced trout, Oncorhynchus mykiss and Salmo trutta. D. chilensis may be extinct.[5]
References
Froese, Rainer; Pauly, Daniel (eds.). "Family Diplomystidae". FishBase. December 2011 version.
Near, Thomas J; Thacker, Christine E (18 April 2024). "Phylogenetic classification of living and fossil ray-finned fishes (Actinopterygii)". Bulletin of the Peabody Museum of Natural History. 65. doi:10.3374/014.065.0101.
Nelson, Joseph S. (2006). Fishes of the World. John Wiley & Sons, Inc. ISBN 0-471-25031-7.
Sullivan, JP; Lundberg JG; Hardman M (2006). "A phylogenetic analysis of the major groups of catfishes (Teleostei: Siluriformes) using rag1 and rag2 nuclear gene sequences". Molecular Phylogenetics and Evolution. 41 (3): 636–62. doi:10.1016/j.ympev.2006.05.044. PMID 16876440.
Rivera-Rivera, Carlos J.; Montoya-Burgos, Juan I. (2018). "Back to the roots: Reducing evolutionary rate heterogeneity among sequences gives support for the early morphological hypothesis of the root of Siluriformes (Teleostei: Ostariophysi)". Molecular Phylogenetics and Evolution. 127: 272–279. doi:10.1016/j.ympev.2018.06.004. ISSN 1055-7903.
Lundberg, John G.; Berra, Tim M.; Friel, John P. (March 2004). "First description of small juveniles of the primitive catfish Diplomystes (Siluriformes: Diplomystidae)" (PDF). Ichthyological Exploration of Freshwaters. 15 (1): 71–82. Archived from the original (PDF) on 2009-03-26. Retrieved 2012-01-28.
Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License
