SYNOPSIS OF THE DESCRIBED HOLOTHYRIDA OF THE WORLD
3/7/2005 
                                                         Recent        Fossil      Status
                                                      Gen.  Spec.    Gen.   Spec.
 
ORDER            Holothyrida                           10      25      0       0 * 
SUPERFAMILY               Holothyroidea                10      25      0       0 * 
FAMILY                      Allothyridae                2       3      0       0 * 
FAMILY                      Holothyridae                6      20      0       0 * 
FAMILY                      Neothyridae                 2       2      0       0 *