Conchs and Chitons of the world - Animals in the Habitats, and Biodiversity

Classified animal picture guide. Highlighting the link of species shows the images, and clicking a link shows Evolutionary Tree.
The followings are extinct Conchs & Chitons excavated and extant Conchs & Chitons in the world. The explanation in brackets is the ages they lived in extinct species, and the habitat in extant species. Note that Mya is million years ago. For example, "48.6~40.4 Mya" shows a range between 48.6 and 40.4 million years ago. The time range is shown in the Geological Time Table. The followings are a part of the Evolutionary Tree.