The "lines of descent" among living things that frequently appear in evolutionist publications are no more than an imaginary concept. No concrete finding of any evolutionary link between living things has so far been discovered.
Scientists state that the fossil record and other findings indicate no such relationship:
"It is, however, very difficult to establish the precise lines of descent, termed phylogenies, for most organisms." (F. J. Ayala and J. W. Valentine, Evolving: The Theory and Process of Organic Evolution, 1978, p. 230)
The 125-million-year-old ground cricket pictured here is not descended from any forerunner, and has remained unchanged throughout the course of its species" existence.