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In a nautical sense, a bar is a shoal, similar to a reef: a shallow formation of (usually) sand that is a navigation or grounding hazard, with a depth of water of 6 fathoms (11 meters) or less. It therefore applies to a silt accumulation that shallows the entrance to or course of a river, or creek.
Aipysurus duboisii, also known commonly as Dubois' sea snake and the reef shallows sea snake, is a species of extremely venomous snake in the subfamily Hydrophiinae of the family Elapidae. Its geographic range includes Papua New Guinea , New Caledonia and the northern, eastern and western coastal areas of Australia , that is the Coral Sea ...
• Sea snake (bottom right) Marine reptiles are reptiles which have become secondarily adapted for an aquatic or semiaquatic life in a marine environment. Only about 100 of the 12,000 extant reptile species and subspecies are classed as marine reptiles, including marine iguanas, sea snakes, sea turtles and saltwater crocodiles. [1]
The olive sea snake, Aipysurus laevis, has been found to have photoreceptors in the skin of its tail, allowing it to detect light and presumably ensuring it is completely hidden, including its tail, inside coral holes during the day. While other species have not been tested, A. laevis possibly is not unique among sea snakes in this respect. [23]
Aipysurus apraefrontalis, commonly known as the short-nosed sea snake or Sahul reef snake, is a species of venomous sea snake in the family Elapidae, which occurs on reefs off the northern coast of Western Australia. English herpetologist Malcolm Arthur Smith described the species in 1926 from a specimen collected on the Ashmore Reef.
Aipysurus fuscus, commonly known as the dusky sea snake or Timor Reef snake, is a species of sea snake in the family Elapidae. [2] It is found in the Timor Sea between Australia , Indonesia and East Timor and has been classified as endangered .
The species is the most commonly beached sea snake on the coast of Southwest Australia, including records at beaches near metropolitan areas. [24] It is also reported from Christmas Island and Cocos (Keeling) Islands (Australia). [25] The yellow-bellied sea snake requires a minimum of 16–18 °C (61–64 °F) to survive, long-term. [26]
A marine coastal ecosystem is a marine ecosystem which occurs where the land meets the ocean. Worldwide there is about 620,000 kilometres (390,000 mi) of coastline. Coastal habitats extend to the margins of the continental shelves, occupying about 7 percent of the ocean surface area.