FIGURE 9 in Two new species of Terebrasabella (Annelida: Sabellidae: Sabellinae) from Australia

FIGURE 9. Single shortest tree (length 15 steps) found from a parsimony analysis of the data matrix shown in Table 2. There were two unequivocal apomorphies supporting the monophyly of Terebrasabella: 5. Two pairs of radioles; and 11. Three abdominal segments. In two of the possible three transformations for each of characters 7–9 the states are apomorphies for the respective genera and so they are marked as supporting these nodes (though marked with *). For Terebrasabella this suggests that there may be three further apomorphies: 7. Rasp-shaped avicular uncini in chaetigers 7–8; 8. Companion chaetae on chaetigers 2–6 only; and 9. Avicular uncini in abdominal chaetigers. Within Terebrasabella, it would appear that T. heterouncinata and T. hutchingsae sp. nov., are sister groups based on the expanded lateral teeth in thoracic uncini (6) and abdominal uncini (10).