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University of Michigan Museum of Zoology, Division of Mollusks

Specimen Records: 228,694
Media Records: 267,539
iDigBio Last Ingested Date: 2026-03-25

The Mollusk Division incorporates approximately 5 million specimens and has long ranked amongst the most important freshwater and land snail collections in North America. Approximately 251,000 cataloged lots including over 406 holotype specimens and more than 1638 paratype lots are preserved as dry shells, ethanol preserved specimens, frozen tissues, lyophilized tissues, fossil material and radular microscope slide mounts. Mollusks from all regions of the planet are represented, with most being from North America, particularly from southeastern and upper mid‐western USA drainages. With the exception of Monoplacophora and Aplacophora, all extant molluscan classes are represented. The collection includes a number of significant subcollections; Bryant Walker Collection (one of the world’s largest private mollusk collections containing over 100,000 lots and about two million specimens), Royal Ontario Museum Collection [outstanding collection of North American (principally Canadian) freshwater and land mollusks], F. C. Baker Wisconsin Freshwater Mollusk Collection (one of the most extensive North American freshwater mollusk collections), Stelfox Sphaeriid Collection (one of the most important reference collections of cosmopolitan freshwater bivalve family Sphaeriidae), and Lyophilized Tahitian Land Snails (about 1600 freeze‐dried tissue samples of a now largely extinct snail family).

Contacts

Name UMMZ Mollusk Data Group
RoleGroup
Emailummz-mollusks-data@umich.edu
Name Admins LSA IT
RoleIT Database Administrator
Emaillsa-it-infra-ipt-admins@umich.edu
Name Admins LSA IT
Rolenone
Emaillsa-it-infra-ipt-admins@umich.edu
Name UMMZ Mollusk Data Group
RoleGroup
Emailummz-mollusks-data@umich.edu
This table shows any data corrections that were performed on this recordset to improve the capabilities of iDigBio Search. The first column represents the correction performed. The last two columns represent the number and percentage of records that were corrected. A complete list of the data quality flags and their descriptions can be found here. Clicking on a data flag name will take you to a search for all records with this flag in this recordset.
FlagRecords With This Flag(%) Percent With This Flag
idigbio_isocountrycode_added  i218553
95.566
dwc_datasetid_added  i194496
85.046
dwc_kingdom_added  i194496
85.046
dwc_parentnameusageid_added  i194496
85.046
dwc_taxonid_added  i194496
85.046
dwc_taxonomicstatus_added  i194496
85.046
gbif_canonicalname_added  i194496
85.046
gbif_genericname_added  i194496
85.046
gbif_taxon_corrected  i194496
85.046
dwc_continent_replaced  i173001
75.647
gbif_vernacularname_added  i136265
59.584
dwc_scientificnameauthorship_replaced  i128023
55.98
gbif_reference_added  i118023
51.607
dwc_multimedia_added  i102128
44.657
dwc_taxonrank_replaced  i88819
38.837
geopoint_datum_missing  i84985
37.161
dwc_originalnameusageid_added  i66085
28.897
taxon_match_failed  i42448
18.561
dwc_family_replaced  i23921
10.46
dwc_specificepithet_replaced  i23139
10.118
dwc_order_replaced  i15721
6.874
dwc_genus_replaced  i13280
5.807
rev_geocode_eez  i4614
2.018
rev_geocode_mismatch  i2488
1.088
dwc_scientificnameauthorship_added  i1936
0.847
dwc_country_replaced  i1710
0.748
dwc_taxonremarks_added  i1028
0.45
rev_geocode_corrected  i458
0.2
rev_geocode_lon_sign  i427
0.187
rev_geocode_failure  i241
0.105
dwc_class_replaced  i146
0.064
dwc_phylum_replaced  i133
0.058
dwc_stateprovince_replaced  i94
0.041
dwc_infraspecificepithet_added  i56
0.024
dwc_kingdom_suspect  i51
0.022
rev_geocode_eez_corrected  i48
0.021
rev_geocode_lat_sign  i31
0.014
geopoint_0_coord  i26
0.011
dwc_genus_added  i14
0.006
dwc_infraspecificepithet_replaced  i5
0.002