Growth of the calcareous skeleton during regeneration of spines of the sea urchin, strongylocentrotus purpuratus (stimpson): A light and scanning electron microscopic study.

@article{Heatfield1971GrowthOT,
  title={Growth of the calcareous skeleton during regeneration of spines of the sea urchin, strongylocentrotus purpuratus (stimpson): A light and scanning electron microscopic study.},
  author={Barry M Heatfield},
  journal={Journal of morphology},
  year={1971},
  volume={134 1},
  pages={
          57-89
        }
}
Growth of the skeleton of regenerating spines of the sea urchin, Strongylocentrotus purpuratus, was studied with the light and scanning electron microscopes during the formation of a growth ring or cycle. Growth was initiated about three days after fracture and was linear between 5 and about 40 days after fracture, with a mean rate of 0.16 mm/day. There-after, a decline in growth rate was observed, being attributed to abrasion. The new skeleton first appeared as minute, conical "micro-spines… CONTINUE READING
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