Cephalodiscus nigrescens is a sessile hemichordate belonging to the order Cephalodiscida.
Parasites The parasitic protozoan Neurosporidium cephalodisci has been found in the nervous system of Cephalodiscus nigrescens.Maletz, Jörg. (2017) Graptolite Paleobiology. Wiley-Blackwell.
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