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Diagnostic Description
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Skelton (1989) redefined the genus Paramphilius emphasizing a highly modified head structure as the most obvious derived feature separating these fishes from other amphiliids. In Paramphilius the tiny eyes are displaced anteriorly on the head by the extreme development of the adductor mandibulae muscles which extend behind the orbits to insert onto the dorsal aspect of the neurocranium. In larger males of Paramphilus the adductor mandibulae are enlarged (hypertrophied) and cause the post-orbit region to bulge noticeably. Paramphilius are soft bodied and cylindrical in shape, the fins are short, rounded and relatively weak compared to other amphiliids. The predorsal length is extended so that the dorsal fin is displaced relatively far back from the head and is positioned above the pelvic fins. A low number of gill rakers (<5 on leading arch) is characteristic. The genus was originally defined by Pellegrin (1907) on having a long, low adipose fin confluent with the dorsal fold of the caudal fin. This character is however unreliable at the generic level as there are both Amphilius species with such a condition, and secondly that it is variable within a species (see Skelton, 1984). Within Paramphilius the character appears to be consistent within the species, but it is not within the genus (Skelton, 1989). The largest species in the genus is Paramphilius baudoni (see below) and only this species has a short notched adipose fin.

This review indicates that a single somewhat variable species occurs in West Central Africa and is represented in collections mostly by a species formerly known as Amphilius baudoni but also by the species Paramphilius goodi . A detailed comparison of the type specimens of A. baudoni with the holotype and one paratype of P.goodi (Table 5) indicates the close physical similarity of the specimens on which the decision to synonymize the nominal species rests. The main difference between the types is in the Principal Caudal fin rays of P. goodi (7+8 vs. 8+9 of A.baudoni ). Although this character might indicate a taxonomic difference with only the type specimens of P. goodi available for examination, there is insufficient reason to avoid the synonymy at present.

There are three Paramphilius species in the Upper Guinean region of West Africa, Paramphilius firestonei Schultz, 1941 , Paramphilius teugelsi Skelton, 1989 , and Paramphilius trichomycteroides Pellegrin, 1907 (Skelton et al., 2003). These species are all smaller sized species and differ in body proportions, especially depth, fin ray counts and the form of the adipose fin (short and notched posteriorly in A. baudoni vs.long, low and confluent with dorsal caudal fin fold in West African Paramphilius species).

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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, pp. 41-68, vol. 1578
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Paul H. Skelton
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Paramphilius
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Paramphilius is a genus of loach catfishes found in Africa.

Description

Paramphilius have a lengthened and cylindrical body with a short and high head and short and round fins. The small eyes are located far forward. The barbels are long. The caudal fin is truncated or round. All of the West African species are uniformly brown with a paler underside; P. firestonei also has irregularly distributed brown spots as well as a dark spot at the base of the caudal fin. Paramphilius species exhibit a peculiar form of sexual dimorphism in that the males mature have a more inflated head.[1] Unlike species of Amphilius, the length of the snout is less than half of the length of the head, the adipose fin is confluent with the caudal fin, and the anal fin has seven or more branched rays.[1]

Species

There are currently four recognized species in this genus:[2]

References

  1. ^ a b Skelton, Paul H. (1992). "Amphiliidae (French)" (PDF). Faune des poissons d'eaux douces et saumâtres d'Afrique de l'Ouest. Tome 2. Musée Royal de l'Afrique Centrale, Tervuren, Belgique and O.R.S.T.O.M., Paris, France, 902. pp. 450–467..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
  2. ^ Froese, Rainer, and Daniel Pauly, eds. (2011). Species of Paramphilius in FishBase. December 2011 version.
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Paramphilius: Brief Summary
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Paramphilius is a genus of loach catfishes found in Africa.

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