Intertidal zone
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The intertidal zone, or foreshore, is the area above water level at low tide and underwater at high tide; in other words, it is the part of the littoral zone within the tidal range. This area can incl
The rocky shoreline of Saint-Malo, northwestern France, with a stripe of the black lichen Hydropunctaria maura at the high tide line
Tide pools at Pillar Point showing zonation on the edge of the rock ledge
A rock, seen at low tide, exhibiting typical intertidal zonation, Kalaloch, Washington, western United States
A California tide pool in the low tide zone
Sea urchin
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Sea urchins or urchins are the class Echinoidea within the echinoderms. Approximately 950 species live on the seabed, inhabiting all oceans and depths from the intertidal zone to the deep sea. They ty
Intertidal zone
…the part of the littoral zone within the tidal range. This area can include several types of habitats with various species of life, such as sea stars, sea urchins, and many species of coral with regional differences in biodiversity. Sometimes it is referred to as the littoral zone or seashore, although those can…
Tripneustes ventricosus and Echinometra viridis
Paracentrotus lividus, a regular sea urchin (Euechinoidea, infraclass Carinacea)
A sand dollar, an irregular sea urchin (Irregularia)
Phyllacanthus imperialis, a cidaroid sea urchin (Cidaroidea)