Recordset

Search Recordset

University of Michigan Museum of Zoology, Division of Mollusks

Specimen Records: 226,915
Media Records: 267,458
iDigBio Last Ingested Date: 2026-02-19

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  i217016
95.638
dwc_datasetid_added  i192864
84.994
dwc_kingdom_added  i192864
84.994
dwc_parentnameusageid_added  i192864
84.994
dwc_taxonid_added  i192864
84.994
dwc_taxonomicstatus_added  i192864
84.994
gbif_canonicalname_added  i192864
84.994
gbif_genericname_added  i192864
84.994
gbif_taxon_corrected  i192864
84.994
dwc_continent_replaced  i172712
76.113
gbif_vernacularname_added  i135591
59.754
dwc_scientificnameauthorship_replaced  i127180
56.047
gbif_reference_added  i116592
51.381
dwc_multimedia_added  i100964
44.494
dwc_taxonrank_replaced  i88675
39.079
rev_geocode_failure  i86455
38.1
rev_geocode_mismatch  i84913
37.421
geopoint_datum_missing  i84075
37.051
dwc_originalnameusageid_added  i65855
29.022
taxon_match_failed  i40972
18.056
dwc_family_replaced  i23843
10.507
dwc_specificepithet_replaced  i23096
10.178
dwc_order_replaced  i15697
6.918
dwc_genus_replaced  i13273
5.849
dwc_scientificnameauthorship_added  i1946
0.858
dwc_country_replaced  i1707
0.752
dwc_taxonremarks_added  i927
0.409
dwc_class_replaced  i146
0.064
dwc_phylum_replaced  i133
0.059
dwc_stateprovince_replaced  i94
0.041
dwc_infraspecificepithet_added  i56
0.025
dwc_kingdom_suspect  i51
0.022
geopoint_0_coord  i26
0.011
dwc_genus_added  i14
0.006
dwc_infraspecificepithet_replaced  i5
0.002