The pair travelled over 2,250 km (1,400 mi) throughout the Amazon Basin, the most species-rich palm region in the world, collecting and sketching specimens.

Araneae, or spiders, are the most familiar of the arachnids, and the most species-rich with around 40,000 described species.

The ecoregion is the most species-rich in peninsular India, and is home to numerous endemic species.

It is the most species-rich and widely distributed genus in the family with some 73 described species and new forms being discovered on a regular basis.

The most species-rich shark family, the catsharks, are fairly small-bodied.

The Amazon represents more than half the planet's remaining rainforests and comprises the largest and most species-rich tract of tropical rainforest in the world.

Hymenolepis microstoma is a member of the Cyclophyllidea, one of the youngest and most species-rich group of tapeworms.

The ecoregion is one of the most species-rich in India with a rich diversity of birds, mammals, and plants.

This is the most species-rich of the few marine fish families that are endemic to the Australian region.

In the tropics, it is quite common to find that Ficus is the most species-rich plant genus in a particular forest.