A pelvis characterized by an anteroposterior diameter of the inlet greater than the transverse diameter is classified as (DNB Dec 2011)
Pelves are classified as belonging to one of four major groups.
a. The gynecoid pelvis is the classic female pelvis with a posterior sagittal diameter of the inlet only slightly shorter than the anterior sagittal diameter.
b. In the android pelvis, the posterior sagittal diameter at the inlet is much shorter than the anterior sagittal diameter, limiting the use of the posterior space by the fetal head.
c. In the anthropoid pelvis, the anteroposterior (AP) diameter of the inlet is greater than the transverse diameter, resulting in an oval with large sacrosciatic notches and convergent side walls. Ischial spines are likely to be prominent.
d. The platypelloid pelvis is flattened with a short AP and wide transverse diameter. Wide sacrosciatic notches are common. The pelves of most women do not fall into a pure type and are blends of one or more of the above types.