Scutus olunguis Iredale, 1940
Description: Shell moderately light in weight, broader posteriorly, with apex slightly behind centre. Sculptured with irregular concentric growth ridges and sometimes a granular surface. Margin thickened internally, upturned externally, with a notch anteriorly. Colour white inside and outside, with a lamellar brown periostracum.
Size: Up to 47 mm in length.
Distribution: In Australia, Shark Bay, WA, to Wooli, NSW.
Habitat: Intertidal on rocky shores. Common in tropical Australia, uncommon in NSW.
Comparison: Compared with S. antipodes this species has a smaller, lighter weight shell with a more pronounced anterior notch.
Remarks: This species probably occurs throughout the tropical Indo-West Pacific region. The name of that widespread species is unclear, although many authors have used Scutus unguis (Linnaeus, 1758). Until the question is resolved, Iredale's name is used here.
Fig. 1 HOLOTYPE Port Curtis, Queensland (C.107419)
Copyright Des Beechey 2004