 The rail family contains more than 150 species divided into at least 50 genera , the exact number depending on the authority . The Zapata rail is the only member of the genus Cyanolimnas , and is considered to be intermediate between two other New World genera , Neocrex and Pardirallus . All six species in the three genera are long @-@ billed , five have drab plumage , and all but one have a red spot at the bill base . They are believed to be descended from Amaurornis @-@ like ancestral stock . 
