The hardness of the teeth of five species of echinoids (Echinodermata)

Klinger, TS.; Lawrence, JM.

Journal of Natural History 195: 917-920


ISSN/ISBN: 0022-2933
DOI: 10.1080/00222938500770561
Accession: 021937083

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There is no significant (P .ltoreq. 0.05) difference in the scratch hardness (Mohs' H = 4 .+-. 0; mean .+-. 1 S.D.) or indentation hardness (34.87 .+-. 479 kp/mm2) of the teeth of Lytechinus variegatus, Arbacia punctulata, Diadema antillarum, Echinometra lucunter, or Eucidaris tribuloides. The hardness of the teeth of these echinoids give them the ability to scrape or bore into hard carbonate substrata and to ingest calcareous plants. Differences in form and substructure do not affect the hardness of the teeth of these echinoids.