Psorosperm

• Some which affect vertebrate hosts are now identified as coccidia.
• Others, such as the cause of pébrine in silkworms, are now recognized as microsporidians, and some are regarded as myxosporidians.
• The genus Psorospermium itself is a parasite of crayfishes, and belongs to an enigmatic group of unicellular organisms which some biologists think may be related to the common ancestors of animals and fungi.