[1][2] The L. beagle usually is 4-9 centimeters wide, and its body and legs are covered with long golden colored fur.

The rearmost pair of walking legs is smaller than the others and shifted to the side of the abdomen, having been specially adapted for holding sponges to the body.

[4] The sea sponge produces toxins to deter aquatic predators from eating it or the crab.

Andrew Hosie, a crustacean and worm curator at the Western Australian Museum, and Colin McLay, a marine biologist affiliated with the University of Canterbury in New Zealand, then described the crab as a new species, one of the three species in the genus Lamarckdromia.

The crab species is named after the research ship that carried Charles Darwin around the world in his expeditions, the HMS Beagle.