🦀 Horseshoe Crab

Tachypleus tridentatus · wildlife atlas entry

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A 450-million-year lineage older than dinosaurs. Blue, copper-based blood that clots on bacteria made it the medical safety-test for injections; spawning beaches now need guards.

Horseshoe Crab — default reference photo from iNaturalist
(c) Tse Chung Yi, some rights reserved (CC BY-NC), uploaded by Tse Chung Yi

Record card

Scientific nameTachypleus tridentatus
Rankspecies
Community photos7 research-grade records shown

Seen in the wild — community photographs

Tachypleus tridentatus photograph by the iNaturalist community
2026-10-12 · Taiwan
(c) Gavin, some rights reserved (CC BY-NC) · cc-by-nc
Tachypleus tridentatus photograph by the iNaturalist community
2026-09-10
(c) kamaal411, some rights reserved (CC BY-NC) · cc-by-nc
Tachypleus tridentatus photograph by the iNaturalist community
2026-09-12 · Japan
(c) varvaraorca, some rights reserved (CC BY-NC) · cc-by-nc
Tachypleus tridentatus photograph by the iNaturalist community
2026-08-19 · Taiwan
(c) mimison, some rights reserved (CC BY-NC) · cc-by-nc
Tachypleus tridentatus photograph by the iNaturalist community
2026-08-29 · private location
(c) Ho Pak Kei, some rights reserved (CC BY-NC) · cc-by-nc
Tachypleus tridentatus photograph by the iNaturalist community
2026-08-29 · Fukuoka, JP
(c) Tomioka Masafumi, some rights reserved (CC BY-NC) · cc-by-nc
Tachypleus tridentatus photograph by the iNaturalist community
2024-11-07 · Hainan, CN-HA, CN
(c) island-lover, some rights reserved (CC BY-NC) · cc-by-nc

Photographs are Creative Commons-licensed observations from iNaturalist, credited as each licence requires. Click any photo for the full research record.

Data: iNaturalist open API · taxa resolved by exact scientific name · observations filtered to research grade with photos.

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