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Great Eggcase Hunt - global citizen science observations of chondrichthyian eggcases

Dataset homepage

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 https://doi.org/10.15468/v3ugzp accessed via GBIF.org on 2026-05-05. accessed via GBIF.org on 2026-06-04.

Description

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.

Purpose

This dataset displays the broad distribution, diversity of species, and relative abundance of sharks, skates and chimaera around the British Isles and further afield.

Sampling Description

Study Extent

Data is generated from citizen science observations. Many are ad-hoc finds, while some areas are more regularly surveyed using a standardised methodology. The majority of finds are from beach records, with some being in situ records observed while snorkelling or diving.

Sampling

Records are gathered from citizen science observations submitted on an ad-hoc basis, with some Eggcase Champions and partner organisations undertaking more regular, structured surveys.

Quality Control

All data has been approved by a member of staff or via a user of the Community Verification Platform before publication. All records have undergone internal Quality Checks, with checks made against known species range and pin location checked and adjusted as required.

Method steps

  1. NA

Taxonomic Coverages

Chondrichthyes, specifically Heterodontidae, Orectolobidae, Rajidae, Scyliorhinidae and Chimaeriformes
  1. Chondrichthyes
    rank: class
  2. Heterodontidae
    common name: bullhead sharks rank: family
  3. Orectolobidae
    common name: carpet shark rank: family
  4. Rajidae
    common name: skate rank: family
  5. Scyliorhinidae
    common name: catsharks rank: family
  6. Chimaeriformes
    common name: chimaeras rank: order

Geographic Coverages

Global, with a participation bias from the British Isles.

Bibliographic Citations

Contacts

Harriet Allen
originator
position: Data Analyst
Shark Trust
4 Creykes Court, 5 Craigie Drive
Plymouth
pl13jb
Devon
GB
email: conservation@sharktrust.org
email: Harriet@sharktrust.org
userId: https://orcid.org/0000-0001-5108-2032
Cat Gordon
originator
position: Senior Conservation Officer
Shark Trust
4 Creykes Court, 5 Craigie Drive
Plymouth
pl13jb
Devon
GB
email: cat@sharktrust.org
Harriet Allen
metadata author
position: Data Analyst
Shark Trust
4 Creykes Court, 5 Craigie Drive
Plymouth
pl13jb
Devon
GB
email: conservation@sharktrust.org
email: Harriet@sharktrust.org
userId: https://orcid.org/0000-0001-5108-2032
Harriet Allen
administrative point of contact
position: Data Analyst
Shark Trust
4 Creykes Court, 5 Craigie Drive
Plymouth
pl13jb
Devon
GB
email: conservation@sharktrust.org
email: Harriet@sharktrust.org
userId: https://orcid.org/0000-0001-5108-2032
Cat Gordon
administrative point of contact
position: Senior Conservation Officer
Shark Trust
4 Creykes Court, 5 Craigie Drive
Plymouth
pl13jb
Devon
GB
email: cat@sharktrust.org
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