Echinocardium pennatifidum

This heart urchin is a burrowing echinoid within the family Loveniidae, characterized by a bilaterally symmetrical, heart-shaped test covered in dense, fine spines that give the animal a fur-like appearance. Like other spatangoids, it lives infaunally, burrowing into soft sediment where it feeds on organic particles using specialized tube feet, and it maintains a mucus-lined burrow that allows water and oxygen exchange. As a deposit feeder, it plays a role in bioturbation, reworking sediment and cycling nutrients within benthic marine communities, which supports broader ecosystem function in coastal and shelf habitats.

The species has a wide but patchy distribution across the northeastern Atlantic and parts of the Mediterranean, with records spanning the United Kingdom, Ireland, France, Norway, Sweden, Denmark, Germany, the Netherlands, Portugal, Italy, Albania, the Faroe Islands, Svalbard, Mauritania, and disjunct populations reported from Canada and Australia. It occupies soft sedimentary marine substrates, typically in shallow to moderate depths where fine sands or muds allow burrowing.

Its endangered status stems from cumulative pressures across this range. Coastal development and associated habitat loss reduce available sediment habitat, while bottom trawling and other fishing gear physically damage burrows and directly harm individuals. Marine pollution and increased sedimentation alter substrate quality, and ocean acidification and broader climate change affect calcification and larval development.

Competition from invasive species adds further stress in some areas.

Targeted conservation measures specific to this species remain limited, though it may benefit indirectly from marine protected areas, trawling restrictions, and water quality regulations enacted across parts of its European range. Population trends are currently unknown due to insufficient monitoring data. Given the breadth and persistence of ongoing threats without species-specific management, its conservation trajectory remains uncertain and warrants closer population assessment.

Found in the waters off Great Britain, Ireland, the North Sea and associated islands.