Discovered in the deep: the ghost catshark found after an egg hunt

Scientists in Australia solve puzzle of sole egg left in museum and identify new deep-sea species with unique ridged egg case

Off the north-western coast of Australia, near the remote coral atolls of Rowley Shoals, ghost catsharks are slinking through the dim water and searching for bushy colonies of corals growing between 400 and 500 metres (1,300-1,600ft) down.

This is where the elusive sharks lay their egg cases and leave them hanging like Christmas tree ornaments.