Members of the silurid catfish genus Kryptopterus Bleeker ZBK , 1858 are small-to medium-sized fishes found in inland waters throughout Southeast Asia. In recent years, it has been generally acknowledged that Kryptopterus ZBK is a paraphyletic assemblage consisting of at least two distinct clades (Bornbusch, 1995). Recent changes in the taxonomy of the group reflect this paraphyly, in which the large species with elevated (14-17 vs. 8-13) branchiostegal-ray counts and reduced barbels are reassigned to the genus Micronema (e.g. Rainboth, 1996; Kottelat, 2001). One of the species tentatively retained in Kryptopterus ZBK , K. hexapterus , is relatively rare in collections and is a medium-sized silurid easily distinguished by the absence of a dorsal fin, strongly projecting lower jaw, and a highly-arched dorsal profile with a distinct nuchal concavity.
During an ichthyological survey of the Rajang River in northern Borneo, a series of K. hexapterus were obtained, among which included an unusual specimen with larger eye and longer, flatter barbels. Closer examination revealed this specimen to belong to an undescribed species, which is described herein as Kryptopterus platypogon ZBK , new species .
- Heok Hee Ng (2004): Kryptopterus platypogon, a new silurid catfish (Teleostei: Siluridae) from Borneo. Zootaxa 398, 1-8: 1-2, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:43336C62-56F7-46AF-B327-11876818C230
Members of the silurid catfish genus Kryptopterus Bleeker ZBK , 1858 are small-to medium-sized fishes found in inland waters throughout Southeast Asia. Kryptopterus ZBK , as currently understood, is known to be paraphyletic and shown to consist of at least two distinct clades (Bornbusch, 1995). This is reflected in the recent taxonomy of the group, in which the large species with elevated (14-17 vs. 8-13) branchiostegal-ray counts are reassigned to the genus Micronema (e.g. Rainboth, 1996; Kottelat, 2001). The distinctive type species of Kryptopterus ZBK , K. cryptopterus (Bleeker 1851), is widely distributed throughout Southeast Asia and easily identified by its dorsal profile (horizontal or very gently convex and lacking a nuchal concavity) and short maxillary barbels.
While examining material as part of a larger collaborative phylogenetic study of the Siluridae, distinct and consistent differences were observed between populations of K. cryptopterus from mainland (Indochinese peninsula excluding the Malay Peninsula) and Sundaic (Borneo, Java, Sumatra and Malay Peninsula) Southeast Asia. This led to the recognition of the mainland Southeast Asian population as belonging to a distinct species, herein described as K. geminus ZBK , new species .
- Heok Hee Ng (2003): Kryptopterus geminus, a new species of silurid catfish (Teleostei: Siluridae) from mainland Southeast Asia. Zootaxa 305, 1-11: 1-1, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:58933A2D-BA99-466C-90F7-D2D2E88270B4
Molecular Biology and Genetics
Statistics of barcoding coverage
Specimen Records: 20
Specimens with Sequences: 17
Specimens with Barcodes: 17
Species With Barcodes: 6
Kryptopterus is a genus of catfishes belonging to the family Siluridae. They are found in freshwater throughout Southeast Asia. The scientific name comes from Ancient Greek kryptós (κρυπτός, "hidden") + ptéryx (πτέρυξ, "fin"). It refers to the reduced or even entirely absent dorsal fin of these catfishes.
These small- to medium-sized catfishes have opaque, transparent or translucent bodies, hence their common name Asian glass catfishes. Despite this name, only three described species have clearly transparent bodies: K. minor, K. piperatus and K. vitreolus. Most significant among these is the ghost catfish (K. vitreolus), which is the "glass catfish" most often seen in the aquarium fish trade. This species was initially confused with the larger glass catfish (K. bicirrhis; infrequent in aquarium trade) and subsequently with K. minor (essentially absent from aquarium trade). This matter was only fully resolved in 2013.
While 19 species have been described as of 2013, the genus Kryprtopterus is notoriously rich in cryptic species. A number of these have been recognized in recent years, and more are likely to follow:
- Kryptopterus baramensis Ng, 2002
- Kryptopterus bicirrhis (Valenciennes, 1840)
- Kryptopterus cheveyi Durand, 1940
- Kryptopterus cryptopterus (Bleeker, 1851)
- Kryptopterus dissitus Ng, 2001 (Indochinese Sheatfish)
- Kryptopterus geminus Ng, 2003
- Kryptopterus hesperius Ng, 2002 (Maeklong Sheatfish)
- Kryptopterus lais (Bleeker, 1851)
- Kryptopterus limpok (Bleeker, 1852) (Long-barbel Sheatfish)
- Kryptopterus lumholtzi Rendahl (de), 1922
- Kryptopterus macrocephalus (Bleeker, 1858) (Striped Glass Catfish)
- Kryptopterus minor Roberts, 1989
- Kryptopterus mononema (Bleeker, 1846)
- Kryptopterus palembangensis (Bleeker, 1852)
- Kryptopterus paraschilbeides Ng, 2003
- Kryptopterus piperatus Ng, Wirjoatmodjo & Hadiaty, 2004
- Kryptopterus sabanus (Inger & Chin, 1959)
- Kryptopterus schilbeides (Bleeker, 1858)
- Kryptopterus vitreolus Ng & Kottelat, 2013 (Ghost catfish, Phantom catfish, Ghost fish, Glass catfish)
|Wikimedia Commons has media related to Kryptopterus.|
- "Kryptopterus minor Roberts, 1989". Cat-eLog Data Sheets. PlanetCatfish. Retrieved 12 July 2014.
- Ng, H-H. and M. Kottelat (2013). After eighty years of misidentification, a name for the glass catfish (Teleostei: Siluridae) Zootaxa 3630: 308-316.
- SeriouslyFish: Kryptopterus vitreolus. Retrieved 18 July 2014.
- Froese, Rainer, and Daniel Pauly, eds. (2013). Species of Kryptopterus in FishBase. February 2013 version.
- Ng, H.H. & Kottelat, M. (2013): After eighty years of misidentification, a name for the glass catfish (Teleostei: Siluridae). Zootaxa, 3630 (2): 308–316., doi:10.11646/zootaxa.3630.2.6
- Froese, Rainer, and Daniel Pauly, eds. (2014). "Siluridae" in FishBase. July 2014 version.
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