Lanicoidichna metulata Chamberlain, 1971

Description.- Slender vertical galleries that are 2 to 7 mm wide and over 600mm high, and that make 20 to 30mm wide "U" turns at the bottom. One or more additional vertical galleries merge with the main gallery. Oblique and horizontal galleries may link adjacent galleries at the base. One to three vertical galleries may branch from the primary gallery and many are smaller than the primary gallery.

Description : U-shaped vertical burrow with a secondary gallery branching at the base of the main U form burrow and running parallel to it yielding a W-shaped structure; linked at the base by a horizontal burrow. Each tube of the burrow shows uniform diameter of 1 cm and penetrate up to 10 cm; the whole system of burrow is 6 cm across. The burrow filled material is darker than the host sediments and consists of very fine grained particles.