Aegires punctilucens

Aegires punctilucens is a small marine sea slug within the family Aegiridae, distinguished by a tuberculate, yellowish body dotted with distinctive bright spots that give the species its common name. Like other nudibranchs, it lacks a shell as an adult and relies on hard, textured skin and cryptic coloration for defense against predators. It feeds primarily on sponges, using specialized radular teeth to scrape and consume its prey, and in doing so plays a role in controlling sponge populations on hard-bottom marine substrates.

As a hermaphroditic species, it lays coiled egg ribbons in the shallow subtidal zone.

This species occurs widely across coastal marine waters, with records spanning the northeastern Atlantic, including the United Kingdom, Norway, France, Sweden, Denmark, Ireland, Portugal, Spain, and the Isle of Man, as well as more distant locations such as Ghana, Australia, Guam, the Marshall Islands, and New Caledonia. It inhabits rocky reefs and sponge-associated substrates in shallow coastal waters.

No reliable population figures exist, and the population trend is currently unknown. Threats include coastal development that degrades nearshore habitat, marine pollution and chemical contamination affecting water quality and prey sponges, ocean acidification that may reduce prey availability, climate-driven shifts in marine ecosystems, and competition from invasive species establishing in occupied habitats.

Specific, targeted conservation programs for this species have not been widely documented, though it may benefit indirectly from marine protected areas, water quality regulations, and broader coastal habitat management efforts across its range. Given data gaps in population monitoring and the accumulation of ongoing environmental pressures, its long-term outlook remains uncertain, warranting closer population assessment and habitat monitoring.

This nudibranch inhabits rocky intertidal and shallow subtidal zones, typically found on or near encrusting sponges which serve as both habitat and primary food source. It prefers areas with moderate wave action and good water circulation, often occurring in crevices and under overhangs at depths ranging from the low tide zone to approximately 30 meters.