FIGURE 2 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)

FIGURE 2. Presence and absence of birefringent bodies in late-stage embryos that have not been previously reported in some sessile rotifers. Birefringent body absent: A) Ptygura ctenoida, late-stage embryo (fixed with hot glutaraldehyde) and freeswimming larva in lateral and dorsal view. B) Ptygura innominata, late-stage embryo, and free-swimming larva in lateral and dorsal view. C) Limnias ceratophylli, late-stage embryo, and free-swimming larva in dorsal view (foot contracted). Birefringent body present: D) Ptygura longicornis, free swimming larva in dorsal view. E) Ptygura stygis, free swimming larva in dorsal view. F) Ptygura tridorsicornis, free-swimming larva in dorsal view. Arrows mark birefringent bodies. Bar: 50 µm, same scale for all images.