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Recordset

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University of Michigan Museum of Zoology, Division of Mollusks

Specimen Records: 224,286
Media Records: 267,525
iDigBio Last Ingested Date: 2025-06-23

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
  • Data Corrected
  • Data Use
  • Raw
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  i215135
95.92
dwc_datasetid_added  i190958
85.14
dwc_kingdom_added  i190958
85.14
dwc_parentnameusageid_added  i190958
85.14
dwc_taxonid_added  i190958
85.14
dwc_taxonomicstatus_added  i190958
85.14
gbif_canonicalname_added  i190958
85.14
gbif_genericname_added  i190958
85.14
gbif_taxon_corrected  i190958
85.14
dwc_continent_replaced  i171894
76.641
gbif_vernacularname_added  i134104
59.792
dwc_scientificnameauthorship_replaced  i123812
55.203
gbif_reference_added  i114460
51.033
dwc_multimedia_added  i99318
44.282
dwc_taxonrank_replaced  i87765
39.131
geopoint_datum_missing  i83672
37.306
dwc_originalnameusageid_added  i66481
29.641
taxon_match_failed  i39409
17.571
dwc_family_replaced  i23868
10.642
dwc_specificepithet_replaced  i23631
10.536
dwc_order_replaced  i15957
7.115
dwc_genus_replaced  i12333
5.499
rev_geocode_eez  i4273
1.905
dwc_scientificnameauthorship_added  i3566
1.59
rev_geocode_mismatch  i2463
1.098
dwc_country_replaced  i1707
0.761
dwc_taxonremarks_added  i877
0.391
rev_geocode_corrected  i450
0.201
rev_geocode_lon_sign  i425
0.189
rev_geocode_failure  i238
0.106
dwc_class_replaced  i158
0.07
dwc_phylum_replaced  i145
0.065
dwc_stateprovince_replaced  i98
0.044
dwc_infraspecificepithet_added  i56
0.025
dwc_kingdom_suspect  i46
0.021
rev_geocode_eez_corrected  i41
0.018
geopoint_0_coord  i26
0.012
rev_geocode_lat_sign  i25
0.011
dwc_genus_added  i14
0.006
dwc_infraspecificepithet_replaced  i5
0.002
specimen list