Nynantheae without basilar muscles. Aboral end of the body not physa-like. Longitudinal muscles and sometimes spirocysts in the ectoderm of the column. No distinct sphincter. Perfect pairs of mesenteries usually few, 6 or (especially in the case of asexual propagation) rather more. Longitudinal muscles of mesenteries weak.
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1
Electronic version made possible by NSF grant DEB95-21819 in the PEET program to D. G. Fautin.