Name: Great Eggcase Hunt - global citizen science observations of chondrichthyian eggcases
License: This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License

This dataset details approved records from the Shark Trust's Great Eggcase Hunt, active since 2003. Comprised of citizen science observations, both on land and in-situ, records of eggcases from around the world have been complied to help better understand these oviparous species. Data comes from ad-hoc records, regular surveys and data uploads from partner organisations. Please note that not all records are verified, but this has been indicated in the extended Measurements or Facts.

Citation

Allen H, Gordon C (2026). Great Eggcase Hunt - global citizen science observations of chondrichthyian eggcases. Version 1.2. Shark Trust. Samplingevent dataset. https://www.dassh.ac.uk/ipt/resource?r=st_greateggcasehunt&v=1.2

Published

April 30, 2026 at 08:51

First registration

April 30, 2026 at 08:59

License

This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License

URL

https://www.dassh.ac.uk/ipt/resource?r=st_greateggcasehunt

Archive

https://www.dassh.ac.uk/ipt/archive.do?r=st_greateggcasehunt

Contacts

Harriet Allen
Shark Trust

Cat Gordon
Shark Trust

57,079

total submitted occurrences

57,079

accepted occurrences

57,079

measurements and facts

taxa

species

Taxa

Missing and invalid fields

Field	Missing
coordinateUncertaintyInMeters	57,079	100.0%
maximumDepthInMeters	57,079	100.0%
minimumDepthInMeters	57,079	100.0%

Quality flags

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

Flag	Dropped	Records
NO_DEPTH		57,079	100.0%
ON_LAND		25,772	45.2%

Great Eggcase Hunt - global citizen science observations of chondrichthyian eggcases

Taxa

Missing and invalid fields

Quality flags

Measurement types

DNA derived data