Lensky
Lensky did not demonstrate speciation in Escheria coli where speciation means reproductive isolation. Bacteria as Lynn Margulis noted are mighty promiscuous and will share their genes with bacteria whatever humans determine they should be named.
E. coli BTW diverged from its nearest ancestor (salmonella) 100 million years ago. How's that for gradual evolution? After 100 million years it's still E. coli :-)
Biting the hand that feeds IT
