Some groups of borings faithfully reflect the nature of the originating organism. This is particularly the case with the borings of bryozoans. Nevertheless, it is recommended that the name applied to the work of the animal be held distinct from that of the animal itself. Other groups of borings provide less diagnostic evidence of the nature of the borer. This is the case in one-entrance, pouch-shaped borings (excluding acrothoracican borings). There is a need for a general ichnogenus to cover these single-entrance borings and Trypanites Mägdefrau 1932 is redefined to fill this role.