1.(Zool.) A secondary mouth fold developed at the base of each of the armlike lobes of the manubrium of many rhizostome medusæ. See Illustration in Appendix.
scapulet
scapulet
[′skap·yə‚let] (invertebrate zoology) In some medusae, fringed outgrowths on the outer surfaces of the arms near the bell.