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60,000 and 100,000 additional species. Good evidence exists that the gastropods, bivalves, and cephalopods were around by the Cambrian (541 to 485.4 million...

stromatoporoids cephalopods crinoids and blastoids starfish graptolites bivalves gastropods vertebrates echinoids crustaceans gymnolaemate bryozoans Vertibrates Haikouichthys...

had appeared during the Cambrian, became common, especially bivalves, gastropods, and nautiloid cephalopods. Now-extinct marine animals called graptolites...

adaptation is seen on Earth in the Crysomallon squamiferum species (Scaly-foot Gastropod) though not for the same reasons as hypothetical alien life might evolve...

also occurs in 1867. "Caenogastropoda is the dominant group of marine gastropods in terms of species numbers, diversity of habit and habitat and ecological...

their own countries'. "Caenogastropoda is the dominant group of marine gastropods in terms of species numbers, diversity of habit and habitat and ecological...

occurs in phylogenetics, "Caenogastropoda is the dominant group of marine gastropods in terms of species numbers, diversity of habit and habitat and ecological...

America at the Eocene-Oligocene transition resulted in a large turnover of gastropods, amphibians, and reptiles. Mammals were much less affected. Crocodilians...

A group of Gastropod shells, Phylum Mollusca....

Drosophila fruit fly The ebony jewelwing damselfly Calopteryx maculata Some gastropod shells, like those of Partula can coil in sinistral and dextral directions...