Fig. 12
The tiny progenetic kangaroo Microdipodops (top) has a body length of just 75 millimeters. The kangaroo rat Dipodomys (middle) is neotenic, with a body length of about 200 millimeters. The pocket gopher Orthogeomys (bottom) is a much larger hypermorphic rodent that has a body length of about a third of a meter. Reproduced with permission from McNamara (1997)