I took advantage of a beautiful  first quarter of Moon to make a panorama (3 panels) on a very interesting central region.
Are recognizable from the left to the right of the image, Ptolemaeus, Alphonsus and Arzachel. These main craters are often imaged and presented on the site because of varied and well marked reliefs, several grooves and countless small craters very useful to check the setting of the optics. So I looked for other interests. 

The Moon is known to have many chains of craters called Catenas.
The most plausible scenario to explain their formation is the impact of a comet or asteroid. These can fragment under the effect of the Moon's gravity forces, and the fragments reach the surface at a slightly different time, due to the moon's rotation.
This type of crater chain was also discovered on Jupiter's moon Ganymede.
In July 1994, Comet Shoemaker-Levy, which fragmented under the impact of Jupiter's massive tidal forces, made it possible to highlight this type of formation.
Not all Catenas were formed by the same mechanism, but due to volcanic activity and or due to secondary craters.

 As for Ptolemaeus, the annotated version B presents two examples of Catena.
One denoted A which extends under the crater Müller and the other denoted B, Catena Davy.
Only Catena Davy would correspond to the type of fragmentation impact.
For the other, the reason would be volcanic or secondary craters due to a larger size of the impacts.
Nevertheless, the alignment of the craters is so perfect that doubt is allowed. 

For information, I indicated in Alphonsus the drop point of the Ranger 9 launched by NASA in 1965. 

Version C shows a more accurate view of Catena Davy taken by the LRO (Lunar Reconnaissance Orbiter). 

A little humor finally with the D version. I did not resist the pleasure of presenting this image, in the shape of a bird's head or rather of an Owl, with these two huge eyes materialized by Alphonsus and Arzachel and a mouth or a beak by Alpetragius.