Tapes decepta Mollusk Cast a.jpg

• about 510 million years ago. although the group became increasingly abundant about 400 million years ago during the devonian period
• and many of which are exploited as food sources. many of the most important edible species are commonly known (in the usa) simply as clams. venerids make up a significant proportion of the world fishery of edible bivalves. the family includes some specie
• and mussels) are often called bivalves (or bivalved mollusks) because their shell is composed of two parts called valves. bivalves have a long history. their fossils first appear in rocks that date to the middle of the cambrian period
• are a very large family of minute to large
• bivalves really took off following the massive extinction at the close of the permian period. modern bivalves live in a variety of marine and freshwater environments
• but during the paleozoic era they were especially common in near-shore environments. the veneridae or venerids
• common name the venus clams
• from the shallow waters near shore to great depths in the ocean. fossils indicate that bivalves have occupied most of these environments for more than 450 million years
• glen rose formation
• lower cretaceous
• marine bivalve molluscs. over 500 living species of venerid bivalves are known
• mercenaria mercenaria. kingdom: animalia phylum: mollusca class: bivalvia order: veneroida family: veneridae genus: tapes species: decepta drag files here to attach
• mollusk cast
• most of which are edible
• or choose files... max total size 3.95mb
• saltwater clams
• scallops
• such as (in the usa) the hard clam or quahog
• tapes decepta
• tapes decepta mollusk cast site location: glen rose formation bandera county texas
• usa time period: lower cretaceous (100-145 million years ago) data: clams and their relatives (oysters