Knowledge Tree
speckled sea louse
Also known as: speckled sea louse, Speckled sea lice
Facts (12)
Sources
The Lunar Clock Beneath the Waves: How Marine Life Runs on ... bioneers.org Jul 16, 2025 6 facts
claimResearch conducted by scientists in the United Kingdom demonstrated that the tidal clock in speckled sea lice (Eurydice pulchra) is a distinct mechanism that runs separately from the Sun-derived circadian rhythm, rather than being a derivative of the circadian clock.
claimThe speckled sea louse (Eurydice pulchra) is a crustacean measuring one-third of an inch across that lives in the intertidal zone.
claimSpeckled sea lice (Eurydice pulchra) possess two distinct internal schedules: one governed by the Sun and one linked to the tide.
procedureIn a study by scientists in the United Kingdom, speckled sea lice (Eurydice pulchra) collected from a Welsh island continued to swim every 12.4 hours even after researchers knocked out or suppressed genes known to regulate the circadian rhythm.
claimSpeckled sea lice (Eurydice pulchra) possess the ability to sense light, including the spectral illumination provided by the Moon.
claimThe speckled sea louse (Eurydice pulchra) uses chromatophores, which are specialized cells containing color, to turn black for protection against the Sun when the tide goes out.
Wildlife Wednesdays: Odd Lunar Effects on Sea Animals weatherology.com 3 facts
claimSpeckled sea lice possess an internal lunar clock that regulates activity in 12.4-hour intervals, coinciding with tidal cycles.
claimSpeckled sea lice exhibit a monthly activity cycle where they are more active during full and new moons, which correspond with stronger currents, and less active during quarter moon phases and weekly neap tides.
claimSpeckled sea lice change color to protect themselves from the Sun, becoming dark during the day and paler at night.
Why oysters close on the full moon—and more odd lunar effects on ... nationalgeographic.com Apr 17, 2019 3 facts
claimSpeckled sea lice (Eurydice pulchra) exhibit a sun-linked daily cycle where they darken during the day to protect against solar rays and become paler at night.
claimLab experiments have demonstrated that the daily cycle and the tidal cycle of speckled sea lice are separate, as researchers were able to abolish the daily cycle while leaving the tidal cycles intact.
claimThe speckled sea louse (Eurydice pulchra) burrows in the sand in the intertidal zone, which is covered by water at high tide and dry at low tide.