petaloid ambulacrum
noun
: am ambulacrum in which the apical portion is expanded to form an area petaloid in outline on the aboral surface of the test (as in most irregular sea urchins)
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“Petaloid ambulacrum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/petaloid%20ambulacrum. Accessed 26 Nov. 2024.
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