Sirenoscincus mobydick (Miralles et al. 2012, extant) is a tiny burrowing skink with forelimbs only, and no fingers. Only 'flippers'. It nests between Gymnophthalmus and Sineoamphisbaena.

Slavoia darevskii (ZPAL McR-I.112, from the Late Cretaceous of Mongolia, Talanda 2015) is a late surviving basal amphisbaenid nesting between Sirenoscincus and Sineoamphisbaena. Like Tamaulipasaurus, Slavoia appears to have a quadratojugal, but on the quadrate ramus only. More skull bones are identified here than originally.

Other specimens attributed to Slavoia, including the holotype, nest with Gillmoretius.

Miralles A et al. 2012. Variations on a bauplan: description of a new Malagasy "mermaid skink" with flipper-like forelimbs only (Scincidae, Sirenoscincus Sakata & Hikida, 2003). Zoosystema 34(4):701-719.

Sakata S and Hikida T 2003. A fossorial lizard with forelimbs only: description of a new genus and species of Malagasy skink (Reptilia: Squamata: Scincidae). Current Herpetology 22:9-15.

Talanda M 2015. Cretaceous roots of the amphisbaenian lizards. Zoologica Scripta. doi:10.1111/zsc.12138