Just up at The Design of Life blog: Tuatara creeps into limelight ... faster than hardened cement!
"Living fossil" tuatara surprises scientists: Evolves quickly without ever changing.
Excerpt: "In short, the tuatara's sluggish exterior conceals a swiftly changing genome that never got around to doing anything for two hundred million years. That in turn raises the question of just what influence the genome does have on animal form (morphology) or evolution."
It also raises questions about the usefulness of the "molecular clock." Is it right only twice a day?