FIGURE 2. Tennysonia stellata Busk, 1867 in Phylogenetic position and systematics of the bryozoan Tennysonia: further evidence for convergence and plasticity in skeletal morphology among cyclostome bryozoans

FIGURE 2. Tennysonia stellata Busk, 1867, scanning electron micrographs of distal branches showing variations in skeletal organization. A, branch comprising entirely free-walled zooids, SAM A28766, RIY Banks, Port Elizabeth; B, branch with freewalled organization distally but becoming fixed-walled at level of arrow by development of calcified exterior over the kenozooidal apertures, SAM A28765, RIY Bank, Port Elizabeth; C, branch comprising entirely fixed-walled zooids, NHMUK 2003.10.27.7, Groot Bank, Plettenberg Bay. Scale bars: A, B: 1 mm; C: 500 µm.