Merodoras nheco, new genus and species from Rio Paraguay basin, Brazil (Siluriformes, Doradidae), and nomination of the new subfamily Astrodoradinae. Author Horácio Higuchi Author José L. O. Birindelli Author Leandro M. Sousa Author Heraldo A. Britski text Zootaxa 2007 1446 31 42 http://www.zoobank.org/urn:lsid:zoobank.org:pub:AC82821F-1400-4DA7-AD0E-41D7A2B37BE6 journal article z01446p031 AC82821F-1400-4DA7-AD0E-41D7A2B37BE6 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.