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Diagnostic Features
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- Test globular; usually taller than wide.
- Apical disc very small, dicyclic. Periproct small (ca. 30% disc): covered in small granules.
- Ambulacra trigeminate; pore-pairs very small; forming adradial band with perradial granulation.
- Interambulacral plates with primary tubercles forming a vertical column and much smaller secondary tubercles forming rows.
- Plates covered in dense granulation.
- Peristome very small, smaller than apical disc in diameter. Buccal membrane devoid of spicules.
- Secondary spines with thorned shaft.
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Distribution
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Recent; circum Antarctic (S. Africa, S. America, S. Australia). |
| Name gender |
masculine |
| Type |
Echinus horridus A. Agassiz, 1879, p. 203, by original designation. Syntype: Museum of Comparative Zoology, Harvard MCZ 1164. |
| Species Included |
Only the type species. |
| Classification and/or Status |
Camarodonta; Echinoida; Echinidae.
Monotypic.
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| Remarks |
Easily recognized by its unusually tall profile, reduced and offset triads of pore-pairs, very small peristome and plate surfaces that are strongly granulated.
Mortensen, T. 1943. A monograph of the Echinoidea Part III, 3. Camarodonta II. C. A. Retzel, Copenhagen.
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