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Helicoplacus Durham & Caster 1963

L'EdV a l'ha dij dàit për 2 atribù, dont:

Body symmetry
- URI: http://eol.org/schema/terms/body_symmetry
- Definission: overall repetitive or reflective pattern in the body of one individual of this taxon. eg: bilateral symmetry, rotational symmetry, radial symmetry
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pentaradial symmetry
- URI: http://eol.org/schema/terms/pentaradially_symmetric
- Definission: radial symmetry with a five-fold repeating pattern
- Atribussion: https://en.wikipedia.org/wiki/Symmetry_in_biology#Subtypes_of_radial_symmetry
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Helicoplacus a anclud 1 fieul:

Helicoplacus gilberti Durham & Caster 1963