Species: muirkirkensis KRANZ, 1996 (nomen dubium)
Etymology: In reference to the Muirkirk site, northern Prince Georges County, Maryland.
Holotype: USNM 33977
Locality: Muirkirk site, Laurel Quadrangle, USGS 1:24,000, 1979, northern Prince Georges County, Maryland.
Horizon: Arundel Formation, Potomac Group.
Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.