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The bathypelagic zone or bathyal zone (from Greek βαθύς (bathýs), deep) is the part of the open ocean that extends from a depth of 1,000 to 4,000 m (3,300 to 13,000 ft) below the ocean surface. It lies between the mesopelagic above and the abyssopelagic below.
Below the mesopelagic zone it is pitch dark. This is the midnight (or bathypelagic zone), extending from 1,000 metres (3,281 ft) to the bottom deep-water benthic zone. If the water is exceptionally deep, the pelagic zone below 4,000 metres (13,123 ft) is sometimes called the lower midnight (or abyssopelagic zone). Temperatures in this zone ...
It is the first known nudibranch to inhabit the bathypelagic zone, and only one of very few pelagic, free-swimming genera within this generally benthic group. It has a large, bell-shaped oral hood that it can use to catch prey, superficially similar to that of a Venus flytrap and closely resembling that of the nudibranch Melibe.
A scale diagram of the layers of the pelagic zone. Mature snipe eels generally occupy the Bathypelagic Zone. Snipe eels are found in every ocean and generally occupy depths of 300–600 m, though specimens have been caught nearer the surface at night, and storms occasionally result in individuals being stranded on the shore. [21]
Below the mesopelagic zone it is pitch dark. This is the midnight or bathypelagic zone, extending from 1000 m to the bottom deep water benthic zone. If the water is exceptionally deep, the pelagic zone below 4,000 metres (2.5 miles) sometimes is called the lower midnight or abyssopelagic zone.
The pelagic zone contrasts with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom, including the sediment surface and some subsurface layers. Marine organisms such as clams and crabs living in this zone are called benthos. Just above the benthic zone is the demersal zone.
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The oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf (e.g. the neritic zone), but operationally is often referred to as beginning where the water depths drop to below 200 metres (660 ft), seaward from the coast into the open ocean with its pelagic zone.