Pogonopomoides Gosline, 1947



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  • Only one species, Pogonopomoides parahybae (Steindachner, 1877), is recognized.  The following is an excerpt from Armbruster (1998).


    SPECIES

    Rhinelepis parahybae Steindachner 1877:2-5, p,. 2, dem Parahyba.



    DIAGNOSIS

    Pogonopomoides is diagnosed by: a wide ventrolateral strut of the coracoid (28-1); passage of the arrector ventralis muscle of the pectoral girdle through a channel (30-1); very elongate and pointed posterior processes of the pelvic basipterygium (33-2); and loss of the initial anterior section of the diverticulum (40-4).



    DESCRIPTION

    Pogonopomoides appears intermediate in shape between Rhinelepis and PogonopomaPogonopomoides is fairly dorsoventrally flattened with long pectoral and pelvic fins compared to others in the Rhinelepis group.  The body is charcoal gray and without spots in alcohol preserved specimens.  The abdomen is naked except for a row of plates laterally (they are not as large as those in Pogonopoma) and a few randomly placed small plates along the pectoral girdle as well as elsewhere.  Gill openings are large, but not as large as in Rhinelepis.  The cheek lacks elongate odontodes.  Dorsal II-7, pectoral I-6, pelvic I-5, anal 6 (1 unbranched, 5 branched), caudal I-14-I.  24-26 lateral line plates, 7 plates under the base of the dorsal fin, 11-13 plates in the depressed dorsal fin, 12-15 postdorsal plates, 11-13 postanal plates, and 73-98 teeth per jaw ramus.



    COMPARISONS

    Pogonopomoides can be identified from most other loricariids by a combination of a loss of the adipose fin and median pre-adipose plate, a well developed dorsal fin spinelet (vs. a small, rectangular spinelet or no spinelet in Hemipsilichthys, Isbrueckerichthys, Kronichthys, Pareiorhina, and Corymbophanes andersoni), six anal fin rays, and a coracoid that is exposed ventrally.  Within the Rhinelepis group, Pogonopomoides differs from Pogonopoma by the lack of elongate cheek odontodes and lack of an adipose fin; from Pseudorinelepis by the lack of tall ridges on the pterotic-supracleithrum, lack of cheek spines, an incompletely plated abdomen, and the following morphometric features (Table 2): a longer snout length/SL ratio (0.176-0.193 vs. 0.138-0.176), a shorter thorax length/SL ratio (0.189-0.233 vs. 0.258-0.317), a smaller head depth/SL ratio (0.155-0.190 vs. 0.200-0.260), and a smaller cleithral width/SL ratio (0.233-0.275 vs. 0.275-0.311); and from Rhinelepis by having smaller gill openings, only a few plates on the abdomen (versus fully plated), an exposed posteroventral projection of the coracoid, lack of a plate between the opercle and the pterotic-supracleithrum, and the following morphometric features (Table 2): a smaller predorsal length/SL ratio (0.373-0.400 vs. 0.430-0.473), a smaller head length/SL ratio (0.304-0.326 vs. 0.347-0.396), a smaller snout length/SL ratio (0.176-0.193 vs. 0.210-0.243), a smaller interorbital width/SL ratio (0.120-0.137 vs. 0.182-0.194), a larger postanal length/SL ratio (0.260-0.289 vs. 0.203-0.241), a larger dorsal fin length/SL ratio (0.235-0.256 vs. 0.195-0.212), a smaller head depth/SL ratio (0.155-0.190 vs. 0.214-0.243), and a smaller cleithral width/SL ratio (0.233-0.275 vs. 0.286-0.333).



    DISTRIBUTION

    There is one species, Pogonopomoides parahybae, in the Rio Paraíba of southeast Brazil (see below).

    The question mark refers to a potentially introduced population of Rhinelepis.



    LITERATURE CITED

    Armbruster, J.W. 1998. Phylogenetic relationships of the suckermouth armored catfishes of the Rhinelepis group (Loricariidae: Hypostominae). Copeia 1998:620-636.


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