Amphipods

Size

Amphipods are typically less than 10 millimetres (0.4 in) long, but the largest known amphipods are much larger; specimens of Alicella gigantea collected from 5,300 metres (17,400 ft) deep are 27–28 cm (10.6–11.0 in) long, reconstructed gut contents from a black-footed albatross indicates 34 centimetres (13 in), and photographed animals from the Kermadec Trench indicate lengths of up to 34.9 centimetres (13.7 in). The smallest known amphipods are less than 1 millimetre (0.04 in) long. The size of amphipods is limited by the availability of dissolved oxygen, such that the amphipods in Lake Titicaca at an altitude of 3,800 metres (12,500 ft) can only grow up to 22 millimetres (0.87 in), compared to lengths of 90 millimetres (3.5 in) in Lake Baikal at 455 metres (1,500 ft).