Fig. 15

Soft part comparisons of two Nautilus pompilius from Great Barrier Reef, near Lizard Island. The upper photos come from what has traditionally been identified as Nautilus stenomphalus. However, as noted by Saunders and Ward (1987a, b) this taxon is an end member of intergrading forms to traditional N. pompilius. Saunders and Ward (1987a, b) suggested that there was hybridization between the two. But the new genetic findings, above, show no differences in the two different trees among these taxa. They appear to be genetically identical, but arrive at different phenotypes during ontogeny