Description

O-shaped burrows are characterized by a single surface opening leading to a single tunnel that loops back to the surface opening. Typically a short vertical shaft extends from the surface opening and connects to the O-shaped tunnel. The looped tunnel may be vertical to horizontal in orientation. Portions of the looped tunnel may be expanded into a chamber. O-shaped burrows can form from the modification of J-shaped burrows as the organism continues to excavate and connects the end of the “J” back into the main shaft. O-shaped burrows are used as temporary shelters and permanent dwellings.

 

Organisms that produce O-shaped burrows

 

Florida Scrub Millipede	North American Millipede