Codosiga coniunctavita
Extinct (January 23rd, 2019): No reason provided.
These organism evolved from populations of S. flagellata that got stuck in the segments of Marcobrachium crimsonsoni where the microvilli have changed to a fan instead of a ring and the flagella is lost at maturity. They are about 2μm once anchored. C. coniunctavita have evolved to live on M. crimsonsoni by anchoring in the exposed tissue between segments with a protein outgrowths. The microvilli flattened into a fan to filter feed as M. crimsonsoni moves. They reproduce by mitosis, the newly formed C. coniunctavita has a flagella that it uses to swim between the segments of a M. crimsonsoni where it will reabsorb the flagella and start to produce protein strands into the tissue to anchor itself.