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

Contacts:

Harriet Allen
Shark Trust

Cat Gordon
Shark Trust

57,079

occurrence records

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