The specimen weighed 6.5 kg or 14.5 pounds and measured 88 cm or 22 inches in length.

The specimen measured 38.5 cm long and was collected off Quintero, Chile.

The holotype specimen may have measured 8 to 10 m in total body length and was 1.5 to 2 m high at the hips.

The largest known specimen measured 160 mm in shell diameter.

The largest specimen, which was examined in 1851, measured 12.3 m (40 ft) long and weighed 16 tonnes.

The largest known male specimen measured 45 mm long.

The smallest known specimens measure around 350mm.

The largest specimens measured 25 feet long and weighed 550 pounds.

The holotype specimen measured a total length of 38.3 centimetres.

That particular specimen weighed 200 kg (440 lbs) and measured 1.9 metres long (6 ft 3 in).