Huxley, in 1868, divided the carinate birds into Dromaeo-, Schizo-, Desmo-, and Aegithognathae, an arrangement which for many years had a considerable influence upon classification.
Shell with short spire, carinate and pointed.
Huxley regarded the above scheme as nearly representing the affinities of the various Carinate groups - the great difficulty being to determine the relations to the rest of the Coccygomorphae, Psittacomorphae and Aegithognathae, which he indicated " only in the most doubtful and hypothetic fashion."
Relationship of this otherwise typically carinate, neotropical family with the Ratitae had already been insisted upon by T.
Their body is generally compressed and slender; their broad ventral scutes are often carinate on the sides.
Iv., Boston, 1885) gave the Impennes independent rank equivalent to the rest of Carinate birds; M.