x1 is a dinosaur [specific: only clade Dinosauria] of type x2 living in era x3.
A gismu version of dinsauru; contrast with dinso; ignoring connotations relevant to modern birds, the set of rexsa is a strict and nonempty subset of the set of dinso. Includes modern birds; there is no connotation to the contrary in general. Proposed short rafsi: -rex-. Preferred to reksa (for the sake of short rafsi and etymology). See also: ketslau.