Not knowing, not recording, not listing: numerous unnoticed mollusk extinctions.

@article{Rgnier2009NotKN,
  title={Not knowing, not recording, not listing: numerous unnoticed mollusk extinctions.},
  author={Claire R{\'e}gnier and Beno{\^i}t Fontaine and Philippe Bouchet},
  journal={Conservation biology : the journal of the Society for Conservation Biology},
  year={2009},
  volume={23 5},
  pages={
          1214-21
        }
}
Mollusks are the group most affected by extinction according to the 2007 International Union for Conservation of Nature (IUCN) Red List, despite the group having not been evaluated since 2000 and the quality of information for invertebrates being far lower than for vertebrates. Altogether 302 species and 11 subspecies are listed as extinct on the IUCN Red List. We reevaluated mollusk species listed as extinct through bibliographic research and consultation with experts. We found that the number… 
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References

SHOWING 1-10 OF 51 REFERENCES
The Global Decline of Nonmarine Mollusks
TLDR
An overview of global nonmarine molluscan biodiversity and conservation status is provided, including several case studies documenting the diversity and global decline of nonmarinemollusks.
Evolution and Extinction of Partulidae, Endemic Pacific Island Land Snails
TLDR
Analysis of DNA variation, combined with modern ideas of Pacific biogeography, should allow the whole range from the broad origins of the fauna to the detailed evolution within groups of species to be addressed.
Neoextinctions of Marine Invertebrates
TLDR
Searches in the literature and museums for overlooked neoextinctions would fruitfully focus on species reported from highly impacted, urbanized coastal habitats—saltmarshes, estuaries, lagoons, seagrass communities, and supralittoral (maritime) zones—habitats now largely obliterated on most coastal margins of the world.
Assessing and protecting endangered marine species
TLDR
The wide range of life history characteristics in marine species suggests that a range of approaches to assessing extinction risk will be needed, and Protocols for defining significant population units are also required since protection of populations is part of protecting endangered species.
Assessing Extinction Threats: Toward a Reevaluation of IUCN Threatened Species Categories
TLDR
Proposed categories of threat based on the theory of extinction times for single populations and on meaningful time scales for conservation action are presented and suggest are appropriate at least for most large vertebrates.
One or More Extinctions born Sulawesi, Indonesia?
: During the course of a recent compilation of information concerning the natural history of Sulawesi, Indonesia, it became apparent that there were no recent records of the endemic Caerulean
Modern Insect Extinctions, the Neglected Majority
TLDR
By focusing on some of the 70 documented extinctions as case studies, it is suggested that two types of extinction might be common for insects but rare for other taxa: extinction of narrow habitat specialists and coextinctions of affiliates with the extinctions of their hosts.
Global diversity of gastropods (Gastropoda; Mollusca) in freshwater
TLDR
The world’s gastropod fauna from continental waters comprises ∼4,000 valid described species and a minimum of 33–38 independent lineages of Recent Neritimorpha, Caenogastropoda and Heterobranchia, but the status of the great majority of taxa is unknown, a situation that is exacerbated by a lack of experts and critical baseline data.
From 61 species to five: endemic tree snails of the Society Islands fall prey to an ill-judged biological control programme
TLDR
It now seems that the remnant populations of Samoana attenuata discovered only 5 years ago are the only species of partulid still surviving beyond Tahiti on the Society Island group, and Partulidae are clearly a highly threatened family of invertebrates, and in need of the most intense conservation focus.
Extinction vulnerability in marine populations
TLDR
There is an urgent need for improved methods of detecting marine extinctions at various spatial scales, and for predicting the vulnerability of species.
...
1
2
3
4
5
...