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Cephalodiscus calciformis is a sessile hemichordate belonging to the order Cephalodiscida. It is the only pterobranch species with funnel-shaped tubaria.

References

1. Emig, C.C. (1977). On a new species of Cephalodiscus, C. (C.) caliciformis sp. nov. (Hemichordata, Pterobranchia), collected off Madagascar. Bulletin du Museum National d'Histoire Naturelle, Paris. 3E, Zool 493.
2. Swalla, B.J.; van der Land, J. (2020). "Cephalodiscus calciformis". WoRMS. World Register of Marine Species. Retrieved September 17, 2020.
3. Maletz, Jörg (2017). Graptolite Paleobiology. Wiley-Blackwell. ISBN 9781118515617.

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