Rusophycus Hall, 1852

Diagnosis.—Small to large bilobate mounds or depressions with parallel or merged lobes near the posterior; parallel to oblique to transverse striations; however, some specimens may be smooth (Crimes, 1970b, Osgood, 1970; Alpert, 1976a; Fillion & Pickerill, 1990; Keighley & Pickerill, 1996).

Diagnosis: Short (length to width ratio less than 2:1) interfacial bilobate burrow or surface mark resembling a coffee-bean, preserved in convex hyporelief (or, potentially, concave epirelief), Ovate lobes parallel to slightly divergent and may be smooth or exhibit transverse to oblique scratch marks (after Osgood, 1970; Alpert, 1976; Fillion and Pickerill, 1990).