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The evolutionary history of this group is well known due to an excellent fossil record in North America
Plecia pealei (Scudder)
subplanifrons in the early Pliocene
Fragmentary remains have also been reported from Tanzania
Salvinia preauriculata
LK Ammonite Manuaniceras IF-A-16-012 Pennsylvanian The evolutionary history of thisManuaniceras elaboratum Goodland Limestone Lower Cretaceous (Albian) Denton County, Texas This incredible ammonite from the Goodland Limestone in Denton County, Texas is prepared in the original limestone matrix. Most examples of these ammonites are found free of matrix and consequently the rostrum and keel are rarely if ever seen preserved. This specimen has a magnificent 5 inch rostrum. Also present is a significant portion of the preserved keel. A