Temporal range: Miocene–Recent
The shark catfishes form the family Pangasiidae. The shark catfish are found in fresh and brackish waters across southern Asia, from Pakistan to Borneo. Among the 30-odd[quantify] members of this family is the plant-eating, endangered Mekong giant catfish Pangasianodon gigas, one of the largest known freshwater fish. Several species are the basis of productive aquaculture industries in Vietnam's Mekong Delta.
Taxonomy and fossil record
Although Pangasiidae forms a monophyletic group, several studies indicate this group may actually be a subtaxon nested within the family Schilbeidae. Thus, Pangasiidae's familial status may not deserve continued recognition.
Two fossil pangasiid species are described, Cetopangasius chaetobranchus and Pangasius indicus, from the Miocene, and Eocene, respectively. However, the reported age of P. indicus from the Eocene is debatable, as the Sipang Fauna stratum where it is found has never been officially dated. Therefore, the earliest reliable pangasiid fossil age is of C. chaetobranchus from the Miocene.
The dorsal fin is located far forward, close to the head, and is often high and triangular, thus inspiring the common name. The anal fin is somewhat lengthy, with 26–46 rays. There are usually two pairs of barbels, maxillary barbels and one pair of chin barbels, though in adult Mekong giant catfish there are only maxillary barbels. Pangasiids have compressed bodies and a small adipose fins.
- Nelson, Joseph S. (2006). Fishes of the World. John Wiley & Sons, Inc. ISBN 0-471-25031-7.
- Ferraris, Carl J., Jr. (2007). "Checklist of catfish, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa 1418: 1–628. Retrieved 2009-06-25.
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