Dataset

Delaware Museum of Nature and Science – Mollusks

OBIS USA Open in mapper Explore occurrences

The Museum's mollusk collection consists of more than 2 million specimens, making it one of the largest in the United States. The 220,000 cataloged lots represent more than 18,000 species. Worldwide in scope and covering all seven living classes of mollusks, our holdings include marine gastropods (45%), land and freshwater gastropods (30%), marine bivalves (15%), freshwater bivalves (5%) and other (5%). The Museum's mollusk collection is primarily dry shells, with some alcohol preserved cephalopod specimens. Most specimens are recent; however there is some Cenozoic fossil material. Our type collection contains more than 1,200 lots.

Published: July 15, 2025 at 10:08

URL: https://invertebase.org/portal/content/dwca/DMNH-Mollusk_DwC-A.zip

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Delaware Museum of Nature and Science – Mollusks
Delaware Museum of Nature and Science – Mollusks

Elizabeth Shea

Alex Kittle

229,003
occurrence records
5,128
taxa
4,375
species

Taxa

Missing and invalid fields

Field Missing Invalid
coordinateUncertaintyInMeters 228,874
99.9%
decimalLatitude 155,873
68.1%
decimalLongitude 155,875
68.1%
eventDate 110,741
48.4%
maximumDepthInMeters 229,003
100.0%
minimumDepthInMeters 229,003
100.0%
occurrenceStatus 229,003
100.0%
scientificName 167
0.1%
scientificNameID 229,003
100.0%

Quality flags

The OBIS data quality flags are documented at https://github.com/iobis/obis-qc.

Flag Dropped Records
NO_DEPTH 229,003
100.0%
NO_COORD 155,875
68.1%
ON_LAND 66,453
29.0%
NOT_MARINE 56,348
24.6%
NO_MATCH 14,294
6.2%
NO_ACCEPTED_NAME 1,109
0.5%
MARINE_UNSURE 454
0.2%
DATE_IN_FUTURE 19
0.0%
DATE_BEFORE_MIN 4
0.0%

Measurement types

DNA derived data