Petalosticha
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petalostichous — petalostichous, a. Zool. (pɛtəˈlɒstɪkəs) [f. mod.L. Petalosticha, neut. pl. of petalostichus (f. Gr. πέταλ ον leaf + στίχος row) + ous.] Having petaloid ambulacra; belonging to the division Petalosticha of Echinoids … Useful english dictionary