Bilinichnus Fedonkin et Palij, 1979

Diagnosis: Elongate, straight to irregularly (not sinusoidally) winding, paired furrows (in concave epirelief) or paired ridges (in convex hyporelief). Furrows wellspaced, separated by a distance considerably greater than the width of the individual furrows. Exclusively, furrows smooth and lacking ornamentation, with sharp to rounded bases (after Palij et al., 1979).