Echinothrix calamaris

Double spined urchin
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Order:	Diadematoida
Family:	Diadematidae
Genus:	Echinothrix
Species:	E. calamaris
Binomial name
Echinothrix calamaris Pallas, 1774

Echinothrix calamaris, known commonly as the banded sea urchin or double spined urchin among other vernacular names, is a species of sea urchin in the family Diadematidae.

The Banded sea urchin has a slightly oval test (shell), reaching a diameter of about 5 cm. Like almost all the Diadematidae (but it is in Echinothrix calamaris that it is most obvious) it has two different sets of spines, shorter and slender closed spines which are going from yellow to dark (through brown) in colour and can deliver a nasty sting, and longer and thicker spines that are often banded with light and dark colour (but sometimes all dark or all white), and reaching 10 to 15 cm in length. These radiolas can be blunt, and are hollow. The spines are grouped so as to let appear five naked zones on the central part of the test, in a star pattern (called "iridophores"): this pattern can be colored, often in blue. The anal papilla is big, more or less translucent and very obvious on the aborale face; it is generally whitish and speckled with black and white dots, circled by a ring of visual receptors that grant it a rudimentary vision.

The most common form

The two types of spines are very different

The 5-fold symmetry and blue iridophores are obvious on this picture

Specimen with white primary spines.

Darker form

In his darkest forms, it can be confused with its cousins Diadema setosum or Diadema savignyi (which can both keep banded radiola when adults) ; however the latter is bigger, more uniformly black, has less discernible secondary radioles and is recognizable in five characteristic white points at the top of its test as well as in orange-colored circle around its anus. The most common confusion is with the very close species Echinothrix diadema, which can have banded spines when yound. But E. diadema has a very small anal papilla, all black, and the spines have a blue sheen ; the primary radiolas of E. calamaris are more fragile too, and can be crushed between two fingers (they are hollow), what is not the case for E. diadema.

A dark form of this sea urchin is reported in Indian Ocean (Red Sea, Mascarene Islands, Seychelles, the Maldive Islands), with very dark radioles, often not banded, presenting generally a green sheen, and more or less reddish test (sometimes completely red, especially in the Red Sea). The anal papilla is black, more or less punctuated with white, but sometimes punctuated only with black which makes the distinction with Echinothrix diadema particularly difficult, as well as the absence of iridophores. The spines are also sharper and more solid, and cannot be crushed between two fingers. This could be a subspecies or even a separate species, especially as their ecological niche seems slightly différente.

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Wikipedia