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the middle zone of the deep sea between 3700 and 6000 metres.
the abyssopelagic area of the ocean.
the depth zone of the ocean floor between 4000 and 6000 metres, or from about 3700 m downward, or below the 4Â°C isotherm.
living in the water column at 4000 to 6000 metres (or 2500-4000 metres, or 4000-7000 metres, sources differ), seaward of …
abbreviation for acre.
a series of ventro-lateral photophores extending between a vertical at the anal fin origin and the end on the caudal peduncle. …
spiny or spine-like.
postlarval stage of the Peristediidae characterized by long parietal spines and development of rostral exsertions.