Under ancestral conditions before birth control, he would have fathered many more," Dr. Miller writes.

The suborder Mesothelae is unique in having only two types of silk glands - thought to be the ancestral condition.

Foot production of silk may be the ancestral condition, with spinneret production evolving later.

Contrary to the original description, in 2011 it was established that the sacrum consisted of two vertebrae, the ancestral condition, not four.

Based on this cladistic analysis, Mahakala suggests that the ancestral condition for dromaeosaurids is non-flying.

Coelophysis also preserves the ancestral condition of possessing four digits on the hand (manus).

Acceleration, in which the rate of development is increased (compared to the ancestral condition).

Hypermorphosis, in which offset of development is delayed (compared to the ancestral condition).

Predisplacement, in which onset of development occurs earlier (compared to the ancestral condition).

This seems to match the ancestral condition, but it is not known for sure whether the circuitry is homologous.