 The lack of a preserved vertebral column has made it difficult to estimate the exact length of "Leedsichthys".Arthur Smith Woodward, who described the type specimen in 1889, estimated specimen BMNH P.10000 to be of an around nine metre long individual, by comparing this tail of "Leedsichthys", having a preserved height of 274 centimetres (108 inches), with another pachycormid, "Hypsocormus".The length of "Leedsichthys" was not historically the subject of much attention, the only reference to it being made by Woodward himself when he in 1937 indicated it again as 9 metres (29.5 feet) on the museum label of BMNH P.10000.