species (visual id)
 

Marine
fishes
Marine
invertebrates
Marine
mammals
Marine plants &
 seaweeds
Marine
birds
Marine
reptiles

Marine_Fishes.gif

Marine_Invertebra.gif

Marine_Mammals_70.gif

Marine_Plants_51.gif

Marine_Birds.gif

Marine_Reptiles_4.gif

Marine fish have evolved very different biological functions from other large organisms. Fish anatomy includes a two-chambered heart, operculum, secretory cells that produce mucous, swim bladder, scales, fins, lips and eyes.Fish breathe by extracting oxygen from water through their gills. Fins propel and stabilize the fish in the water  The term marine invertebrates is used to describe animals found in a marine environment which are invertebrates(An invertebrate is an animal without a vertebral column.) In order to protect themselves, they may have evolved a shell or a hard exoskeleton, but this is not always the case Marine mammals evolved from land dwelling ancestors and share several adaptive features for life at sea such as generally large size, hydrodynamic body shapes, modified appendages and various thermoregulatory adaptations. Different species are, however, adapted to marine life to varying degrees. The most fully adapted are the cetaceans and the sirenians, which cannot live on land  Marine plants are seaweeds and shore plants
Seaweed is a loose colloquial term encompassing macroscopic, multicellular, benthic marine algae.The term includes some members of the red, brown and green algae. Seaweeds can also be classified by use (as food, medicine, fertilizer, industrial, etc.
Shore plants is plants that colonised the seashore dunes , stabilising the shifting sands and allowing other plants to establish themselves
Marine birds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations. In general, seabirds live longer, breed later and have fewer young than other birds do, but they invest a great deal of time in their young. Most species nest in colonies, which can vary in size from a few dozen birds to millions. Many species are famous for undertaking long annual migrations, crossing the equator or circumnavigating the earth in some cases Marine reptiles which inhabit or frequent the sea include sea turtles, sea snakes, terrapins, the marine iguana, and the saltwater crocodile. Most extant marine reptiles, except for some sea snakes, are oviparous and need to return to land to lay their eggs. Thus most species, excepting sea turtles, spend most of their lives on or near land rather than in the ocean. Despite their marine adaptations, most sea snakes prefer shallow waters not far from land, around islands, especially waters that are somewhat sheltered, as well as near estuaries


 

 
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species (visual id)