Fig. 3.

Traced history of characters 83 and 145. a. Character 83 – Composition of preopercular sensory canal: four or less, short simple tubules [0], seven or eight (up to 10), short simple or branched tubules [1], 12 or more long, simple or branched tubules [2]; b. Character 145 – Anterior extent of first uroneural: preural centra 4 or 3 [0], preural centrum 2 [1], preural centrum 1 [2], centra U1 or U2 [3]