Pedicellaria
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A pedicellaria is a small wrench- or claw-shaped appendage with movable jaws, called valves, commonly found on echinoderms, particularly in sea stars and sea urchins.
Pedicellaria of Acanthaster planci
Aboral surface of an Asterias forbesi sea star showing ring of pedicellariae surrounding spine
The dangerous flower urchin in Taiwan, with its long flower-like venomous pedicellariae
Close-up of flower urchin pedicellariae
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
Pedicellaria
…movable jaws, called valves, commonly found on echinoderms (phylum Echinodermata), particularly in sea stars (class Asteroidea) and sea urchins (class Echinoidea). Each pedicellaria is an effector organ with its own set of muscles, neuropils, and sensory receptors and is therefore capable of reflex responses to…
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)