Under the SeaF. Watts, 1960 - 256 pagine |
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Pagina 107
... vertebrates are a class of creatures normally discussed with the vertebrates . Strictly speaking they do not belong to either group but as they have some features of both they indicate the process of evolution from one to the other ...
... vertebrates are a class of creatures normally discussed with the vertebrates . Strictly speaking they do not belong to either group but as they have some features of both they indicate the process of evolution from one to the other ...
Pagina 108
... vertebrates a notochord forms the first foundations of the backbone . It seems reasonable to suppose , therefore , that in their evolutionary history the vertebrates first had some kind of notochord and that this was later impregnated ...
... vertebrates a notochord forms the first foundations of the backbone . It seems reasonable to suppose , therefore , that in their evolutionary history the vertebrates first had some kind of notochord and that this was later impregnated ...
Pagina 244
... vertebrate . Graptolites : fossil remains of animals believed to be related to sea - firs ( q.v. ) . Heteronereis : a ... vertebrates ) . Jellyfish : invertebrate animal with jelly - like body and tentacles armed with stinging - cells ...
... vertebrate . Graptolites : fossil remains of animals believed to be related to sea - firs ( q.v. ) . Heteronereis : a ... vertebrates ) . Jellyfish : invertebrate animal with jelly - like body and tentacles armed with stinging - cells ...
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arms Atlantic barnacles basking shark beach bivalve blue body bottom breeding burrow cephalopods chitons coast coccolithophores coelacanth color copepods coral crabs crustaceans currents cuttlefish deep deep-sea depths diatoms divers dolphin eels eggs eyes fathoms feed feet long female fins flattened float fronds gastropods giant grow head ichthyosaurs inches long invertebrates jaws jellyfish kinds known lampshell land large numbers larvae light limpet living fossils look male marine animals Mediterranean microscopic million years ago mollusks mouth mussels North oarfish ocean octopus Pacific pair pectoral fins plankton plants and animals plesiosaurs polyps prawns Radiolaria rays reefs remora reptiles rocks salps sand Sargassum sea-anemones sea-lilies sea-pens sea-urchins seabed seaweeds shallow waters shape shark shell ship shoals shore side skeleton skin small fishes South species spines sponges squid stalk starfish surface waters swim tail teeth temperature tentacles tide tropical tube Velella vertebrates weed whale shark worms zone