Bivalves and Tusk shells of the world (Phylogenetic tree) - Animals in the Habitats, and Biodiversity
Classified animal picture guide. Highlighting the link 
of species shows the images, and clicking the link shows Evolutionary Tree.
of species shows the images, and clicking the link shows Evolutionary Tree.The followings are extinct Bivalves excavated and extant Bivalves & Tusk shells 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.
- Kingdom Animalia
- Phylum Mollusca
- Class Polyplacophora (Chitons)
- Class Gastropoda (Abalone, Limpets, Conch, Nudibranchs)
- Class Cephalopod (Squid, Octopus, Cuttlefish, Nautilus, Ammonite)
- Class Bivalvia (Clams, Oysters, Scallops, Mussels)
- Subclass Palaeotaxodonta (Nut clams)
Nut clams Nuclear nut clam (European coast) - Subclass Cryptodonta (Awning clams)
Awning clams Toga awning clam - Subclass Pteriomorphia (Oysters, Mussels)
Ark clams Noah's ark (Mediterranean Sea),
Blood cockle (Indo-West Pacific),
Leafy ark (Indo-West Pacific),
Porpellor ark (Tropical area in Pacific)Dog cockles Dog cockle (Northeast Atlantic),
Reeve's bittersweet (Southeast Pacific)Sea mussels Blue mussel (World wide),
(Choromytilus chorus) (west coast of South America)Oysters Aviculopecten (409.1～216.5 Mya; Great Dying③),
Monotis (249.7～199.6 Mya)Scallops Great scallop (Mediterranean Sea),
Iceland scallop (Northeast Atlantic),
Austral scallop (Australia),
Queen scallop (Mediterranean Sea)Thorny oysters Regal thorny oyster (Tropical sea in Asia),
Pacific thorny oyster (Southwest Pacific)Tree oysters Flat tree oyster (Caribbean Sea)Pen shells Rough pen shell (Mediterranean Sea),
Flag pen shell (Tropical sea)Wing oysters Pearl oyster (Tropical sea),
Akoya pearl oyster (Tropical sea)Hammer oysters White hammer (Tropical sea) - Subclass Paleoheterodonta (Freshwater Mussels)
Trigonal shells Trigonia (216.5～65 Mya),
Myophorella (183.7～112 Mya),
Laevitrigonia (175.6～65.5 Mya) - Subclass Heterodonta (Clams, Cockles)
Rudists Hippurites (99.6～65.5 Mya)Cockles Heart cockle (West Pacific; Heart shell),
Giant cockle (Indian Ocean)Giant clams Giant clam (Tropical sea in Pacific; １．２m),
Tevoro clam (Tropical sea in Pacific),
Southern giant clam (Tropical sea in Pacific)Razor shells Pod razor (Mediterranean Sea),
Pacific razor clam (Northwest Pacific) - Subclass Anomalodesmata
- Subclass Palaeotaxodonta (Nut clams)
- Class Scaphopoda (Tusk shells)
Tusk shells Elongate tusk (Tropical sea),
Elephant tusk (Southwest Pacific),
Beautiful tusk (West Pacific)
- Class Polyplacophora (Chitons)
- Phylum Mollusca