Climate

Scientists confirm horseshoe crabs in a second Philippine province, urge conservation

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Briefings

Scientists confirmed horseshoe crab presence in Tawi-Tawi province, Philippines, for the first time, identifying two species resembling the endangered tri-spine and data-deficient mangrove types. Researchers interviewed 142 residents across four municipalities to establish baseline data for conservation. The study was led by Ivane Pedrosa-Gerasmio and student Quesie Tolero Omnos, published in November 2026.

Key points

• Scientists identified two horseshoe crab species in Tawi-Tawi province, Philippines, previously unknown in the country.
• The tri-spine horseshoe crab is listed as endangered on the IUCN Red List, while the mangrove species is data deficient.

Context

This finding expands known horseshoe crab distribution in the Philippines from Palawan to Tawi-Tawi, prompting urgent conservation efforts for the endangered species.

Limitations

Evidence relies on interviews with 142 residents; specific population counts or historical trends remain unreported.

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