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''Phyllacanthus imperialis'', also known as the Sputnik urchin, imperial lance urchin, imperial sea urchin, imperial urchin, pencil sea urchin, lance urchin, knobby sputnik sea urchin, mine urchin, and land mine sea urchin, is a species of 
It has distinctive thick, blunt spikes. The test is brown or black. The spikes vary in color. This species emerges at night to eat invertebrates and sponges. During the day, it tends to remain hidden in holes in the coral reef. ''Phyllacanthus imperialis'' is found throughout the Indo-Pacific region.
sea urchin
Sea urchins or urchins () are echinoderms in the class (biology), class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal zone to deep seas of . They typically have a globular body cove ...
s in the family Cidaridae
Cidaridae is a family of sea urchins in the order Cidaroida.
Description and characteristics
Cidarid sea urchins are characterized by their stout skeleton : the test is thick and hard, with massive perforated tubercles (never crenulated) su ...
.
It has distinctive thick, blunt spikes. The test is brown or black. The spikes vary in color. This species emerges at night to eat invertebrates and sponges. During the day, it tends to remain hidden in holes in the coral reef. ''Phyllacanthus imperialis'' is found throughout the Indo-Pacific region.
References
{{Taxonbar, from=Q2607960 Cidaridae Echinoderms described in 1816