Sounds like a candidate for explanation via common design to me.
Orb-weaver spiders are one of the most common types of spiders. They’re the ones you find in your garden, building those beautiful big circular webs.
Bats and cetaceans (whales and dolphins) are very different.
A recent paper in the journal Biological Reviews of the Cambridge Philosophical Society offers some striking comments about the prevalence of discordance among phylogenetic trees.
What are the odds that two genes would independently converge on a similar DNA sequence?