It seems that there are some taxa that have a greater potential to radiate through adaptations. Off my head, I can think of birds:
- Darwin's finches
- Hawaiian honeycreepers
- House finches (Carpodacus mexicanus)
- Manakin (or other passerine birds)
Also, there are some fish:
- Cichlid fish (Lake Victoria in east Africa)
- Threespine Stickelback
Plants:
- Hawaiian silverswords
- Erythranthe lewisii (Lewis' monkeyflower, great purple monkeyflower)
Lizard(s):
Insects:
- Heliconius butterflies
- Drosophila (Hawaiian Drosophila particularly)
- Spider (Maybe peacock spider)
- Leaf beetle
Generally:
- Angiosperm plants
- Dinosaurs
- Marsupial mammals
- etc.
So, is there a group of organisms (taxa could be any level: family, gender, species...) that is consistently radiating more than other?
By radiation I take the points that Grant defines here:
These examples have the following in common: (1) they comprise several to many species, (2) the species vary morphologically in conspicuous ways, and relatedly, (3) they occupy a diversity of ecological niches. Most of the species were (4) derived from a single ancestor in their current environment, and (5) most diverged relatively rapidly.