Mesonerilla prospera
Encyclopedia
Mesonerilla prospera is a species of invertebrate
Invertebrate
An invertebrate is an animal without a backbone. The group includes 97% of all animal species – all animals except those in the chordate subphylum Vertebrata .Invertebrates form a paraphyletic group...

 in the Nerillidae
Nerillidae
Nerillida is a family of invertebrates containing the following genera:* Meganerilla* Mesonerilla* Nerilla* Nerillidium* Nerillidopsis* Paranerilla* Psammoriedlia* Thalassochaetus* Troglochaetus...

 family.

As an Endangered Species

In 2000 Mesonerilla prospera was put on the IUCN Red List
IUCN Red List
The IUCN Red List of Threatened Species , founded in 1963, is the world's most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the world's main authority on the conservation status of species...

 under the critically endangered
Critically endangered
Version 2010.3 of the IUCN Red List of Threatened Species identified 3744 Critically Endangered species, subspecies and varieties, stocks and subpopulations.Critically Endangered by kingdom:*1993 Animalia*2 Fungi*1745 Plantae*4 Protista-References:...

catergory. It remains endangered today.
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