Deuterodon, EIGENMANN, 1907

DEUTERODON EIGENMANN, 1907 View in CoL

Type species: Deuterodon iguape Eigenmann, 1907

Junior synonyms : Myxiops Zanata & Akama, 2004 View in CoL (type species Myxiops aphos Zanata & Akama, 2004 View in CoL ). Probolodus Eigenmann, 1911 View in CoL (type species Probolodus heterostomus Eigenmann, 1911 View in CoL ).

New combinations: Deuterodon aphos ( Zanata & Akama, 2004) comb. nov., Deuterodon burgerai ( Zanata & Camelier, 2009) comb. nov., Deuterodon giton ( Eigenmann, 1908) comb. nov., Deuterodon hamatilis ( Camelier & Zanata, 2014) comb. nov., Deuterodon hastatus (Myers, 1928) comb. nov., Deuterodon heterostomus ( Eigenmann, 1911) comb. nov., Deuterodon intermedius ( Eigenmann, 1908) comb. nov., Deuterodon janeiroensis ( Eigenmann, 1908) comb. nov., Deuterodon luetkenii ( Boulenger, 1887) comb. nov., Deuterodon mutator ( Eigenmann, 1909) comb. nov., Deuterodon oyakawai ( Santos & Castro, 2014) comb. nov., Deuterodon pelecus ( Bertaco & Lucena, 2006) comb. nov., Deuterodon ribeirae ( Eigenmann, 1911) comb. nov., Deuterodon sazimai ( Santos & Castro, 2014) comb. nov., Deuterodon taeniatus ( Jenyns, 1842) comb. nov.

Diagnosis: With the proposed composition, an expanded genus Deuterodon is distnguished from the remaining Stethaprioninae by the following combination of characters: a naked caudal fin, circuli absent on posterior field of scales, laterosensory pore anterior to dilatator fossa oriented dorsomedially (except in D. mutator ), base of the teeth from the inner premaxillary row smaller than their distal portion (except in D. heterostomus , D. oyakawai and D. sazimai ), rhinosphenoid expanded dorsally between olfactory nerves and the presence of a single tubule for passage of blood vessels on the lamellar portion of the maxilla.

Synapomorphies: Deuterodon is herein obtained as monophyletic, supported by the three molecular and four morphological synapomorphies, mostly related with dentition: presence of five or more cusps on teeth from outer premaxillary row (177:1), seven or more cusps on first maxillary tooth (194:1), six or more cusps on dentary teeth (202:1) and presence of two pairs of uroneurals (427:1).

Several species currently assigned to Astyanax , mostly from coastal basins of southern Brazil were found to be closely related to Deuterodon as defined by Lucena & Lucena (1992). These species are herein transferred to Deuterodon , expanding the taxonomic definition of the genus.Also, the genera Myxiops Zanata & Akama and Probolodus Eigenmann are synonymized with Deuterodon . ‘ Hyphessobrycon ’ luetkenii was also consistently recovered in this clade and transferred to Deuterodon . ‘ Deuterodon ’ potaroensis Eigenmann, 1909 was not found in this clade and remains as incertae sedis in the Stethaprioninae.