Fossil, morphological, and molecular evidence shows that langurs and ruminants do not share a recent common ancestor.This is important with respect to lysozyme evolution, because it supports the hypothesis that the similar changes observed in the lysozyme sequence in both langurs and ruminants

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The fact that langurs and ruminants do not share a recent common ancestor suggests that the similar changes observed in the lysozyme sequence in both groups are not due to homology or purifying selection. Additionally, the absence of a recent common ancestor makes it unlikely that the changes are the result of a molecular clock. Therefore, the most likely explanation is that the changes are the result of convergent evolution, where similar environmental pressures led to the independent evolution of similar traits in these two groups.

Fossil, Morphological, and Molecular Evidence Shows That Langurs and Ruminants