Fissurellidae – Fissurellinae: Macroschisma productum A. Adams, 1851 (‘elongated keyhole-limpet’)
Synonym(s): productum A. Adams, 1850.
Typical shell-length 25 mm. As with all keyhole-limpets, the shell sits atop a much larger animal. Lives intertidally and subtidally atttached to stones and the shells of living molluscs. Native. Endemic to southeastern Australia (NSW, TAS, VIC and SA).