Examples from the Web for thoracal
In the frontal plane two galear bows project upwards, and two thoracal bows downwards.
Galear and thoracal bows simple, of nearly equal size, larger than the frontal bows between them.
Galear and thoracal bows forked, the former smaller than the frontal bows, the latter larger.
Galear bows simple, thoracal bows forked, both somewhat broader than the frontal bows.
Galear bows simple, smaller than the frontal bows, which are again smaller than the thoracal bows.