Anurida maritima

Distinguished from other springtails by its intertidal habitat association and the combination of dark slaty blue coloration with dense white hydrophobic hairs covering the body. Unlike most springtails, it cannot leap due to its vestigial furcula. The rounded, slightly posteriorly expanded body shape differs from more elongate terrestrial collembolan forms. Similar marine or shore-dwelling springtails occupy different microhabitats or exhibit different color patterns.

Strictly intertidal zone, inhabiting rocky shores and tidal marshes. Found on vertical clay-walls of creeks where individuals construct air-filled nest cavities that serve as refuges during high tide. At low tide, forages on salt marsh surfaces and rock-pool surfaces.

Cosmopolitan distribution in marine intertidal zones worldwide. Present in Arctic and Sub-arctic regions, Cape region, Caribbean mainland, Europe, and Mediterranean. In the British Isles, absent from north-east Scotland and south-east Ireland; absent from the Baltic Sea. Populations in northern Europe may represent a distinct cryptic species from Mediterranean populations.

Active throughout the year in warmer parts of its range. In cooler temperate regions, active only during summer months; overwinters as diapausing eggs. Emergence from overwintering eggs occurs in early May; adults present from July through autumn.

Scavenger, feeding on dead animals in the upper intertidal zone. Prey items include chiefly crustaceans (including barnacles) and molluscs.

Univoltine with egg diapause as the central overwintering strategy. Eggs laid in summer enter diapause and do not hatch; diapause is terminated by temperatures below 5°C in autumn, but further development is suppressed by winter cold until spring. Eggs hatch in April following overwintering. New generation emerges in early May; first adults appear in July. Adults die primarily in autumn, with mortality potentially linked to starvation as body size, glycogen, and lipid content decline in late autumn. Moulting occurs within nest cavities.

Forms dense aggregations of up to several hundred individuals on rock-pool surfaces. Exhibits rhythmic aggregation behavior entrained by tidal inundation cycles. During high tide, retreats to air-filled nest cavities in clay walls; during low tide, forages on exposed marsh surfaces. Activity patterns are weather-dependent: sunshine reduces movement between nests and foraging areas, while darkening and low temperatures increase activity; rainfall drives individuals toward nests due to rising marsh moisture. Possesses endogenous circatidal rhythm with a 12.4-hour period, using visual cues for orientation during movements. Produces aggregating pheromones that mediate group formation.

Significant scavenger in the upper intertidal zone, contributing to nutrient cycling and decomposition of marine animal remains. Its aggregation behavior and tidal rhythms represent a distinctive component of intertidal community dynamics.

• Anurida bisetosaFormerly synonymized with A. maritima in 1953, but recent genome-wide analyses support separation; distinct genetic lineages with mitochondrial and nuclear divergence, though morphologically similar.
• Other intertidal springtailsA. maritima is distinguished by its specific rocky shore and tidal marsh habitat, vestigial furcula, and dark slaty blue coloration with white hydrophobic hairs; other species occupy different intertidal microhabitats or exhibit different morphologies.

• springtail
• collembolan
• intertidal
• marine
• aggregation
• diapause
• circatidal rhythm
• cryptic species
• endosymbiont
• scavenger
• rock pool
• tidal marsh

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• Catalogue of Life
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• Life history strategy and egg diapause in the intertidal collembolan Anurida maritima
• Genome Wide Analyses Corroborate Cryptic Speciation in Anurida maritima (Collembola, Poduromorpha)
• Mitochondrial genome divergence supports an ancient origin of circatidal behaviour in the Anurida maritima (Collembola: Neanuridae) species group
• Wolbachia and Spiroplasma endosymbionts in the Anurida maritima (Collembola) species group