Published online by Cambridge University Press: 18 November 2009
The parasite was found in the bile ducts of three sperm whales, which were caught in the 1957–58 whaling season.
As specimens were found independently in bile ducts of three whales this position in the host appears to be the natural habitat. All the worms were in pieces and incomplete. The pieces, in each case, totalled approximately 18 metres, 0·9 metres and 21 metres respectively. The holotype (length 18 metres) was probably complete except for a few terminal proglottids because it consisted of two very long pieces and one short piece which could be fitted together. The type material has been deposited in the British Museum (Natural History) Registered No. 1961·12·12·1 (Holotype) and 1961·12·12·1 (Para types).