Overview

Comprehensive Description

[[ Genus Kryptopterus ZBK ]]

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
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[[ Genus Kryptopterus ZBK ]]

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
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Molecular Biology and Genetics

Molecular Biology

Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Kryptopterus

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Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:20Public Records:0
Specimens with Sequences:17Public Species:0
Specimens with Barcodes:17Public BINs:0
Species:6         
Species With Barcodes:6         
          
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Wikipedia

Kryptopterus

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.[1]

These small- to medium-sized catfishes often have transparent or translucent bodies, hence their common name Asian glass catfishes. Most significant among these is the Ghost Catfish (K. minor), which is the "glass catfish" most often seen in the aquarium fish trade. It is frequently misidentified as its larger relative the Glass Catfish (K. bicirrhis), which is, however, rarely if ever traded. This was only realized in 1989, however; earlier authors assumed K. minor to be K. bicirrhis by default.

Species[edit]

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:[2][3]

Some species formerly placed in Kryptopterus are nowadays in other genera, in particular Phalacronotus but also Micronema and Pterocryptis.

Footnotes[edit]

  1. ^ PlanetCatfish (2006)
  2. ^ Froese, Rainer, and Daniel Pauly, eds. (2013). Species of Kryprtopterus in FishBase. February 2013 version.
  3. ^ a b 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

References[edit]

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