title: [Possible and actual trends in the evolution of invertebrates].
mesh_terms: D000818:Animals; D000845:Annelida; D005075:Biological Evolution; D003063:Cnidaria; D004447:Echinodermata; D011161:Porifera
vernacular_title: O vozmozhnykh i osushchestvlennykh napravleniiakh évoliutsii bespozvonochnykh