Emended diagnosis: Vertical or oblique, U-shaped burrows with single-spreite lamina; spreite lamina may be unidirectional or bidirectional. Limbs unlined.
Emended diagnosis: Vertical to oblique, U-shaped, single-spreite burrows; spreite may be unidirectional or bidirectional, continuous or discontinuous. Limbs unlined and smooth, or with bioglyphs, sometimes with heavy lining. Limbs either parallel or diverging upward or downward; top of limbs sometimes with funnel shaped opening.