Romeriscus, the Oldest Known Reptile

Science  07 Jul 1967:
Vol. 157, Issue 3784, pp. 56-59
DOI: 10.1126/science.157.3784.56


The description of Romeriscus, a new genus of limnoscelid reptile, is based on a partial skeleton from the Early Pennsylvanian (Westphalian A) of Nova Scotia. Although it is the earliest and most primitive reptile yet known, it is probably already too late and too specialized to be ancestral to the more advanced Carboniferous and Permian captorhinomorphs and pelycosaurs.