Overview

Comprehensive Description

Genus Amphilius Guenther

The genus is diagnosed on derived musculo-skeletal characters by Diogo (2003). These features are (1) the anterior margin of the mesethmoid is bifurcated, (2) there is a prominent medial process on the postero-medial surface of the angulo-articular, (3) the presence of a muscle-3 for the mandibular barbels, (4) the abductor profundus muscle is differentiated into a thick and a thin bundle with the thicker bundle situated anteriorly to the thinner. An additional derived feature is shared with other amphiliid genera, namely that the dorsal division of the arrector dorsalis muscle is constituted as a single mass of fibres situated on the ventral surface of the pectoral girdle.

Amphilius generally are small, soft-bodied catfishes found in rocky reaches of streams and rivers and are the least specialized members of this family. The head is depressed and soft skinned; the mouth terminal, broad with fleshy lips; and the villiform teeth are in bands along the upper and lower jaw. There are three pairs of simple barbels, a maxillary pair from the lateral corners of the mouth and two mandibular pairs on the ventral side of the lower jaw. The small eyes are without a free border, dorsal, widely spaced, and in the median third of the head. Anteriorly the body is moderately depressed becoming compressed posteriorly; the caudal peduncle is short, deep and compressed. The paired fins are large and fan-like with the first ray curved, pectinate and well padded. The dorsal fin is short-based, soft and flexible. There is a low, elongate or shorter, teardrop shaped adipose fin. Fin ray formulae are generally similar between the species and diagnostic features are more often found in terms of body proportions and features of the head. The species are variously cryptically patterned with bars, spots or marbling in shades of brown, black and cream. Sexual dimorphism is usually subtle, often only evident in mature and sexually active individuals. Seven species are recognized from the WCA region, four are new and described herein. Most have restricted distribution ranges and are uncommon in collections.

  • Paul H. Skelton (2007): New species of the amphiliid catfish genera Amphilius, Doumea and Phractura and the taxonomy of Paramphilius from West Central Africa (Siluriformes, Amphiliidae). Zootaxa 1578, 41-68: 44-44, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:91D85038-3B5D-4493-AE8C-6D2ECA205CAA
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Physical Description

Diagnostic Description

The genus is diagnosed on derived musculo-skeletal characters by Diogo (2003). These features are (1) the anterior margin of the mesethmoid is bifurcated, (2) there is a prominent medial process on the postero-medial surface of the angulo-articular, (3) the presence of a muscle-3 for the mandibular barbels, (4) the abductor profundus muscle is differentiated into a thick and a thin bundle with the thicker bundle situated anteriorly to the thinner. An additional derived feature is shared with other amphiliid genera, namely that the dorsal division of the arrector dorsalis muscle is constituted as a single mass of fibres situated on the ventral surface of the pectoral girdle.

 

Amphilius generally are small, soft-bodied catfishes found in rocky reaches of streams and rivers and are the least specialized members of this family. The head is depressed and soft skinned; the mouth terminal, broad with fleshy lips; and the villiform teeth are in bands along the upper and lower jaw. There are three pairs of simple barbels, a maxillary pair from the lateral corners of the mouth and two mandibular pairs on the ventral side of the lower jaw. The small eyes are without a free border, dorsal, widely spaced, and in the median third of the head. Anteriorly the body is moderately depressed becoming compressed posteriorly; the caudal peduncle is short, deep and compressed. The paired fins are large and fan-like with the first ray curved, pectinate and well padded. The dorsal fin is short-based, soft and flexible. There is a low, elongate or shorter, teardrop shaped adipose fin. Fin ray formulae are generally similar between the species and diagnostic features are more often found in terms of body proportions and features of the head. The species are variously cryptically patterned with bars, spots or marbling in shades of brown, black and cream. Sexual dimorphism is usually subtle, often only evident in mature and sexually active individuals. Seven species are recognized from the WCA region, four are new and described herein. Most have restricted distribution ranges and are uncommon in collections.

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Paul H. Skelton

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Ecology

Habitat

Depth range based on 4 specimens in 2 taxa.

Environmental ranges
  Depth range (m): 0.5 - 2

Graphical representation

Depth range (m): 0.5 - 2
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
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Depth range based on 4 specimens in 2 taxa.

Environmental ranges
  Depth range (m): 0.5 - 2

Graphical representation

Depth range (m): 0.5 - 2
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:237
Specimens with Sequences:191
Specimens with Barcodes:184
Species:13
Species With Barcodes:12
Public Records:6
Public Species:3
Public BINs:3
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Barcode data: Amphilius sp. NM2010

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

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Statistics of barcoding coverage: Amphilius sp. NM2010

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 2
Specimens with Barcodes: 2
Species With Barcodes: 1
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Barcode data

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Wikipedia

Amphilius

Amphilius is a genus of catfishes (order Siluriformes) of the family Amphiliidae.[1]

Amphilius catfish have fairly lengthened bodies, with short, depressed, and broad heads. They have three pairs of fringed barbels. The eyes, small and located dorsally, are very distant from each other, and are without a free edge. The caudal fin is forked or emarginated.[2] Unlike species of Paramphilius, the snout is greater than half of the snout length, the adipose fin is not confluent with the caudal fin in adult specimens, and the anal fin has seven or fewer branched rays.[2]

Species[edit]

The 27 currently recognized species in this genus are:[3]

References[edit]

  1. ^ Ferraris, Carl J., Jr. (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa 1418: 1–628. 
  2. ^ a b Skelton, Paul H. (1992). "Amphiliidae" (PDF). Faune des poissons d'eaux douces et saumâtres d'Afrique de l'Ouest (in French). Tome 2. Musée Royal de l'Afrique Centrale, Tervuren, Belgique and O.R.S.T.O.M., Paris, France, 902. pp. 450–467. 
  3. ^ Froese, Rainer, and Daniel Pauly, eds. (2011). Species of Amphilius in FishBase. December 2011 version.
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