Heart urchins are unusual in not having a lantern.
2.
In 1997, an epizootic event involving the red heart urchin occurred off the coast of Cura�ao.
3.
The group includes the well known heart urchins, as well as some less familiar and extinct forms.
4.
Red heart urchins burrow at the rate of an hour during the day and twice as fast as this at night.
5.
As a result, heart urchins, unlike most other sea urchins, are bilaterally symmetrical, and have a distinct anterior surface.
6.
The red heart urchin has few predators but is sometimes preyed on by stingrays and other fish, loggerhead turtles and the sea star " Oreaster reticulatus ".
7.
The irregular sea urchins are an infra-class inside the Euechinoidea, called Irregularia, and include Atelostomata and Neognathostomata . " Irregular " echinoids include : flattened sand dollars, heart urchins.
8.
Sediment texture is detailed in panel 6, a polychaete worm is evident in panel 7, and panel 8 shows " Echinocardium " ( heart urchin ) shell fragments in silt matrix.
9.
Several red heart urchins may aggregate and the progress of each one through the sediment can be observed by a depressed trail left behind as it progresses and a slight mound of coarser material above it.
10.
Fosssil of heart urchins of this genus have been found in the sediments of Europe, United States, Egypt and Australia from Cretaceous to Pliocene ( age range : 85.8 to 2.588 Ma ).
Meaning
sea urchin having a heart-shaped body in a rigid spiny shell
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