The scientific name refers to the describer's nephew, Alan Robb. The common name refers to the large size and thick-set build. From 1970-1977 known as Leiolopisma alani, from from 1977-2009 as Cyclodina alani. Minor exceptions are one reference to the species as Leiolopisma homolonatum (Whitaker 1973) and Robb's continued use of Leiolopisma alani (1977-1980).
There is little potential identification conflict, except for O. ornatum.
Not available yet.
A very large skink, up to 142mm SVL, and 100g. This skink has a very thick-set body that is rather square in cross-section, with short limbs and toes. Dorsal surfaces brown with irregular series of large, pale, dark-edged blotches which may extend to the sides. Head has a pale yellow, black-edged 'tear-drop' beneath the eye. Black markings may occur above forelimbs. Throat cream, usually with dark flecks. Ventral surfaces tellowish to reddish pink, sometimes with dark flecks. The mean body mass of skinks in the Mercury Islands is 48g (Towns 2002), ranging 30-50g (Towns 1991). (Robb 1980, Jewell 2008).
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