Delturus Eigenmann and Eigenmann, 1889

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Delturus anguillicaudatus, photo by J.W. Armbruster


Juvenile Delturus anguillicaudatus, photo by J.W. Armbruster


Delturus parahybae, photo by K.S. Cummings


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    • Armbruster (1997) determines that a clade consisting of Delturus and Upsilodus (Upsilodus  may be synonymous with Hemipsilichthys gobio) form a monophyletic group sister to all other loricariids.  A manuscript is currently in preparation by myself, Roberto Reis, and Edson Pereira, so limited information is provided here.  In my thesis (Armbruster, 1997), I mistakenly referred to the juvenile Delturus I had available as Upsilodus.  Delturus are among the largest of loricariids.

    SPECIES

    D. anguilicauda (Steindachner 1876)
    D. carinotus (La Monte 1933)
    D. parahybae Eigenmann and Eigenmann 1889


    COMPARISONS

    Delturus can be separated from all other loricariids except Upsilodusby the presence of a postdorsal ridge made up of raised, median, unpaired plates and the presence of an adipose fin membrane. Upsilodus can be separated from Delturus by not having the anterior plates of the ridge contacting the lateral plates (juvenile Delturus also have this condition), by having a rectangular (vs. V-shaped) spinelet, and by having 7 dorsal-fin rays (vs. 8+).  Juvenile Delturus have a condition of the postdorsal ridge plates approaching that of Upsilodus, so care must be taken not to confuse the two

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