mesonemertini：释义

A group or order of nemerteans having the lateral nerves in the dermal muscular layer; the body-wall consisting of ectoderm, dermis, an external circular, an internal longitudinal, and usually an intermediate diagonal layer of muscles; the mouth behind the brain; no cæcum; and the proboscis without stylets. It includes the family Cephalothricidæ. Compare Protonemertini, Metanemertini, and Heteronemertini.