Identifying factors: Central valves with clear longitudinal ridges. End and side radial ridges clearly rows of nodules. There are in fact 3 species that have the snakeskin skirt. One, S torri, is limited strictly to the far south and Stewart Is and is half the size of the others. S. sinclairi is NZ wide has no longitudinal ridges and the radials are barely nodulous usually not at all.
Identifying factors: Central valves with clear longitudinal ridges. End and side radial ridges clearly rows of nodules. There are in fact 3 species that have the snakeskin skirt. One, S torri, is limited strictly to the far south and Stewart Is and is half the size of the others. S. sinclairi is NZ wide has no longitudinal ridges and the radials are barely nodulous usually not at all.
Apart from the skirt having the distinct snakeskin look with the distinctive light and dark banding pattern of large scales there are also the central valves with clear longitudinal ridges. End and side radial ridges shows rows of nodules. Lurking on a shaded rock wall in the low intertidal zone.