The hectocotylus in benthic octopuses is usually the third right arm.

底栖章鱼中的交接腕通常是第三个右臂。

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Anything at or just below the surface of the seabed-the benthic zone, in fishery parlance-gets dragged up.

海底或仅仅在海底表面下一点，用渔业的说法，就是深海底栖带，任何生活在这里的生物都会被拖上来。

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The result shows that the benthic macrofauna in theinvestigated area was rare, 56 species were only identified.

调查结果表明：本调查区域大型底栖动物较贫乏，经鉴定有56种；

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Non-fish groups include whales, dolphins, seabirds, squid, echinoderms, benthic crustaceans and small worms.

BBC: The model should aid future management of the North Sea

Whale bones for example are known to constitute an excellent surface on which benthic communities deprived of local sources of energy can settle and develop.

UNESCO: MEDIA SERVICES

Thus, the composition of benthic communities (the term indicates a dependency on the bottom) will rely partly on the availability of organic substances falling all the way down to the seabed.

UNESCO: MEDIA SERVICES