Morphological character reconstruction in Cnidaria. Reconstruction of key morphological characters in Cnidaria based on the phylogenetic hypothesis based on mitogenomic data. (1) symmetry: b = bilaterial, r = radial or biradial; (2) gain (+) and loss (−) of free-swimming medusoid stage (many hydrozoans have secondarily lost the medusoid phase); (3) velum (lost in some leptothecate hydrozoans); (4) strobilation; (5) gastric filaments; (6) ephyrae; (7) radial canal (scored uncertain in Cubozoa); (8) circular canal; (9) square symmetry of horizontal cross section; (10) gastrodermal muscles: e = in bunches of ectodermal origin, g = in bunches of gastrodermal origin, n = not organized in bunches. Morphological characters are taken from Marques and Collins (2004) and Cartwright and Nawrocki (2010) studies. Drawings were provided by Matthew Palen.
Kayal et al. BMC Evolutionary Biology 2013 13:5 doi:10.1186/1471-2148-13-5