madreporites造句

• Active fissiparity seems to be correlated with 6 arms and 4 madreporites.
• The undivided individual has 1 to 5 madreporites and at least one is found in each offspring.
• New arms usually appear in groups of 4 and are normally accompanied by the appearance of additional madreporites.
• During the next months, the juveniles grow and add arms and associated madreporites in the pattern described by Yamaguchi until the adult numbers is attained 5 7 months after metamorphosis.
• It is unclear why fission starts in any particular part of the disc rather than any other, but the origin seemed to bear some relation to the position of the madreporites and the longest arm.
• In another sample of juvenile " Scierasterias heteropau ", the arms were similarly arranged in groups of three and there were 4 madreporites, 2 on the original and 2 on the regenerated section.
• Six years later Ernst Haeckel observed that members of the genus " Ophidiaster " ( " Linckia " ) were prone to cast off arms and that new discs, arms, madreporites and mouths formed on the severed surface of these.