FIGURE 7 in The dorsal plate is a critical feature in the reassessment of the rotiferan genus Ptygura (Monogononta; Gnesiotrocha; Flosculariidae)

FIGURE 7. Relationship between dorsal plate and corona arrangement. Photographs from top to bottom: A: Ptygura longicornis (no dorsal plate). Next, representative species with dorsal plate: B: P. mucicola, C: P. furcillata, D: Limnias melicerta, and E: Beauchampia crucigere. Diagrams show the different layout models of the cephalic region: A: no dorsal plate, no dorsal gap ciliature, neck dorsal flexion, corona plane transversal to the body axis, opened dorsally; B: dorsal plate with short hooks, small dorsal gap ciliature, no dorsal flexion, corona plane transversal, opened frontally; C: dorsal plate with long hooks, wide dorsal gap ciliature, no dorsal flexion, corona in the frontal plane, opened dorsally; D: dorsal plate with protrusions, wide dorsal gap ciliature, no dorsal flexion, corona plane from transversal to frontal, opened dorsally; E: dorsal plate with long tube protecting the dorsal antenna, medium size dorsal gap ciliature, slightly ventral flexion, corona plane transversal, opened frontal to ventrally. Diagram columns from left to right: ventral view, lateral view, dorsal view. Symbols: thin black line, trunk, pharynx, and corona basal field; thick black line, corona ciliature; thick light grey line, dorsal gap; dark grey, dorsal plate and processes; dotted lines, body planes frontal (F), transverse (T) and medial (M). Bars: 50 µm, same scale for all images.