Integrated Publishing Toolkit(IPT)

free and open access to biodiversity data

University of Michigan Museum of Zoology, Division of Mollusks

Latest version published by University of Michigan Museum of Zoology on Nov 26, 2021 University of Michigan Museum of Zoology

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).

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 193,844 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.


Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 193,844 records in English (14 MB) - Update frequency: monthly
Metadata as an EML file download in English (5 KB)
Metadata as an RTF file download in English (6 KB)


The table below shows only published versions of the resource that are publicly accessible.


Researchers should respect the following rights statement:

The publisher and rights holder of this work is University of Michigan Museum of Zoology. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 7dd6e9f8-f252-42c9-bd34-221716095973.  University of Michigan Museum of Zoology publishes this resource, and is itself registered in GBIF as a data publisher endorsed by U.S. Geological Survey.


Occurrence; Specimen


Who created the resource:

UMMZ Mollusk Data Group
UM Museum of Zoology Mollusk Division

Who can answer questions about the resource:

UMMZ Mollusk Data Group
UM Museum of Zoology Mollusk Division

Who filled in the metadata:

Admins LSA IT
IT Database Administrator

Who else was associated with the resource:

Geographic Coverage


Bounding Coordinates South West [-90, -180], North East [90, 180]

Additional Metadata

Alternative Identifiers 7dd6e9f8-f252-42c9-bd34-221716095973