Fig. 4.

Joint lattices. (A) Over a larger domain, the dot-stripe mechanism produces joint lattices where stripes maximize their distance to the nearest dot. (B) For different parameters, joint lattices can be more or less ordered, and polygonal, hexagonal or square. (C) Images of Ichthyosaur forefins, revealing lattice-like phalangeal patterns. Samples are from the Sedgwick Museum (University of Cambridge): (i) CAMSM J.47047 Ichthyosaurus sp. Lias. Lyme Regis; (ii) CAMSM J.35187 Ichthyosaurus sp. Lias. Lyme Regis (collected by Mary Anning).