Oichnus asperus Nielsen et Nielsen, 2001
Synonymy
Type specimens
Descriptions and remarks
Diagnosis – (After Nielsen & Nielsen, 2001, p. 110.) “Oichnus having openings of regular to irregular elongate-oval outline. The margin is perpendicular to the substrate surface.”
Description – Oichnus having regular elongate oval-shape. The margin of each opening is perpendicular to the substrate surfaces, and the dimensions of the external and internal openings are unequal. The dimensions of the openings vary between specimens with external lengths c. 240 μm, widths c. 100 μm and internal lengths c. 150 μm, widths c. 90 μm.
Emended diagnosis:Sedilichnus having openings of regular to irregular elongate-oval outline. The margin is perpendicular to the substrate surface; the walls in the distal end are straight or slightly rounded (after Nielsen and Nielsen, 2001).
Occurrences
Browse Categories of Architectural Design (CADs):
Borings with elliptical to sub-rectangular cross sections | Branched tubular borings | Camerate boxwork borings | Camerate network borings | Circular holes and pit-shaped borings | Clavate-shaped borings | Cylindrical vertical to oblique borings | Dendritic and rosetted borings | Elongate or branched attachment bioerosion traces | Fracture-shaped bioerosion traces | Globular to spherical borings | Groove bioerosion traces | Multiple attachment bioerosion traces | Non-camerate boxwork borings | Non-camerate network borings | Pouch borings | Radial borings | Single circular to tear-shaped attachment bioerosion traces | Spiral borings | Trackways and scratch imprints | U-shaped borings | Winding borings |