Neoplecostomus Eigenmann and Eigenmann, 1888
 


Neoplecostomus microps, photo by K.S. Cummings

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  • Neoplecostomus was recently reviewd by Langeani (1990).  The following is an excerpt from Armbruster (1997).

    SPECIES

    N. espiritosantensis Langeani 1990
    N. franciscoensis Langeani 1990
    N. granosus (Valenciennes, 1840)
    N. microps (Steindachner 1876)
    N. paranensis Langeani 1990
    N. riberensis Langeani 1990
    N. variipictus Bizerril 1995



    DESCRIPTION

    The species of Neoplecostomus live in fast water and have a modified shield of small plates on the abdomen with posteriorly directed odontodes (see below); the shield appears to act as a holdfast.  Color pattern is generally mottled brown with the abdomen white.  Four or more predorsal plates.  Three rows of plates on the caudal peduncle.  Caudal fin forked.  Dorsal portion of the exposed cleithrum without a posterior flap.  No elongated odontodes along the snout margin.  Pectoral fins inserted well dorsal to the plane in which the pelvic fins are inserted.  Head long, rounded, and shovel-shaped.  Fins spines weak.


    Neoplecostomus microps, photo by K.S. Cummings



    COMPARISONS

    Can be distinguished from all other loricariids by a shield of small plates on the abdomen (see above).  In other loricariids, the abdominal plates are either more generally placed and not surrounded by naked areas or are absent.  Some Pareiorhaphis have similar plates on the abdomen, but they are not nearly as well developed, and the Pareiorhaphis hjave five or more rows of plates on the caudal peduncle (vs. 3), no dorsal fin spinelet (vs. small, rectangular spinelet present), and elongated odontodes on the snout margin of breeding males.


    Langeani, F. 1990. Revisão do gênero Neoplecostomus, com a descricão de quatro espécies novas do sudeste brasileiro (Ostariophysi, Siluriformes, Loricariidae). Comun. Mus. Ciênc. PUCRS, Sér. Zool. Porto Alegre 3:3-31.


    If you have any comments or questions regardng this site, please contact Jon Armbruster at armbrjw@mail.auburn.edu