Autapomorphy of Hemibrycon surinamensis:

1. Extent of implantation of teeth along maxilla (137): (0> 1) extending across almost entire maxillary lamella. Reversal of synapomorphy 1 of node 202. Paralleled in node 208 and in Grundulus cochae, Nematobrycon palmeri, and Prodontocharax melanotus .