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- Sea Urchins (11174 bytes)
2: ...image | image = [[Image:seaurchin.jpg|250px]] | caption = A Sea urchin}}
45: ...ion. In most urchins, a light touch elicits a prompt and visible reaction from the spines, which conve...
47: ...'. The name comes from Aristotle's accurate description in his ''History of Animals:''
51: ... that the spines are truly venomous (unlike the [[Wiktionary:pedicellaria|pedicellaria]]e between the spines, ...
61: ...ih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=12578984].
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