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APERTURAL SPINE [1 record]

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Record 1 1977-09-29

English

Subject field(s)
  • Paleontology
CONT

(...) on one side (...) [of the metasicula of a graptolite] is embedded the "virgella" (usually a conspicuous spine), while on the other, symmetrically placed apertural spines (2 or, rarely, 1) may arise when growth is complete (...)

French

Domaine(s)
  • Paléontologie
CONT

L'ouverture de la sicule mûre ("métasicule") [d'un Graptolite] est garnie d'une longue épine primordiale, la "virgella", et d'"épines buccales" secondaires.

Spanish

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