Merodoras nheco, new genus and species from Rio Paraguay basin, Brazil (Siluriformes, Doradidae), and nomination of the new subfamily Astrodoradinae Author Higuchi, Horácio Author Birindelli, José L. O. Author Sousa, Leandro M. Author Britski, Heraldo A. text Zootaxa 2007 1446 31 42 journal article 10.5281/zenodo.176125 76114203-ca1a-4afc-a9e6-b5bd9ea9d2c8 1175-5326 176125 Astrodoradinae , new subfamily Type genus. — Astrodoras Bleeker, 1862: 5 . Genera included. — Amblydoras Bleeker, 1862 ; Anadoras Eigenmann, 1925 ; Astrodoras Bleeker, 1862 ; Merodoras new genus ; Hypodoras Eigenmann, 1925 ; Physopyxis Cope, 1871 ; and Scorpiodoras Eigenmann, 1925 . Diagnosis. — The genera and species of the subfamily Astrodoradinae can be distinguished by the following combination of characters: spinous postcleithral process (except in Anadoras ); lacrimal serated (except in Anadoras ), forming anterior corner of orbit (except in Physopyxis ; also present in Pterodoras and Lithodoras ); number of pleural ribs reduced, four to seven (also shared with Acanthodoras , Agamyxis , Trachydoras , Doras fimbriatus , D. punctatus and Oxydoras eigenmanni ). Other diagnostic, but more widespread, features include: simple barbels, nuchal foramina absent, and gas bladder with abbreviated cordiform shape.