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Recordset

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CHAS Malacology Collection (Arctos)

Specimen Records: 15,483
Media Records: 991
iDigBio Last Ingested Date: 2025-04-18

The Chicago Academy of Sciences’ malacology collection consists of freshwater, marine, and terrestrial Mollusca, as well as specimens representing Echinodermata, Porifera, Brachiopoda, and Cnidaria. It is the third largest in the state of Illinois with approximately 15,000 specimens, split mainly between gastropods and bivalves. Many specimens are associated with Academy collectors, e.g. William Stimpson (1832-1872) or Frank C. Baker (1867-1942). Other major collectors include Elizabeth Emerson Atwater, William Wirt Calkins, Ruthven Deane, J. H. Handwerk, R. L. Lea, Howard N. Lyon, E. N. King, J. W. Velie, Frank Morley Woodruff, and Mrs. E. C. Wiswall. The collection consists mainly of North American varieties of mollusk, with a strong regional focus on the Midwest. Approximately 24% of domestic lots originated in Illinois. Academy expeditions in the late 1800s and early 1900s contributed a significant number of specimens from California and Florida, while a number of specimens collected by William Stimpson came from the eastern coast of the United States. Additional specimens originated in Bermuda, the Bahamas, Mexico, China, Indonesia, and Japan. Collection includes 7 holotypes and 50 syntypes, and specimens were primarily collected pre-1945.

Contacts

Name Dawn Roberts
RoleDirector of Collections
Emaildroberts@naturemuseum.org
Name Dawn Roberts
RoleDirector of Collections
Emaildroberts@naturemuseum.org
Name Erica Krimmel
RoleAssistant Collections Manager
Emailekrimmel@naturemuseum.org
Name David Bloom
RoleCoordinator
Emaildbloom@vertnet.org
Name Dawn Roberts
RoleDirector of Collections
Emaildroberts@naturemuseum.org
  • 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  i12031
77.705
dwc_continent_added  i11761
75.961
dwc_datasetid_added  i8411
54.324
dwc_parentnameusageid_added  i8411
54.324
dwc_taxonid_added  i8411
54.324
dwc_taxonomicstatus_added  i8411
54.324
gbif_canonicalname_added  i8411
54.324
gbif_genericname_added  i8411
54.324
gbif_taxon_corrected  i8411
54.324
dwc_scientificnameauthorship_added  i8243
53.239
dwc_taxonrank_added  i8093
52.27
gbif_reference_added  i7035
45.437
geopoint_datum_error  i6597
42.608
dwc_multimedia_added  i6309
40.748
dwc_continent_replaced  i2614
16.883
dwc_order_replaced  i2394
15.462
gbif_vernacularname_added  i1969
12.717
taxon_match_failed  i1677
10.831
dwc_order_added  i1565
10.108
dwc_family_replaced  i505
3.262
rev_geocode_eez  i411
2.655
dwc_taxonrank_replaced  i315
2.034
dwc_genus_added  i297
1.918
dwc_class_replaced  i243
1.569
dwc_phylum_replaced  i236
1.524
dwc_specificepithet_added  i193
1.247
dwc_originalnameusageid_added  i189
1.221
dwc_family_added  i181
1.169
dwc_kingdom_suspect  i136
0.878
dwc_genus_replaced  i69
0.446
geopoint_low_precision  i37
0.239
dwc_class_added  i6
0.039
dwc_phylum_added  i3
0.019
geopoint_0_coord  i1
0.006
geopoint_similar_coord  i1
0.006
rev_geocode_failure  i1
0.006
rev_geocode_mismatch  i1
0.006
specimen list