Fig. 2

Variation in number of cnidosacs and presence/absence of kleptocnides: a) longitudinal section of a single cnidosac in one ceras from Caloria elegans (scale bar = 50 μm); b) longitudinal section of multiple cnidosacs in the dendronotid Hancockia californica (scale bar = 100 μm); and c-d) longitudinal sections of cnidosacs lacking kleptocnides: c) Favorinus auritulus (USNM1276034), and d) Phyllodesmium colemani. Scale bars = 50 μm