Plica umbra LINNAEUS 1758
| Descriptions of new reptiles from the Andes of South America, preserved in the British Museum George A Boulenger (1912) Ann. Mag. nat. Hist. 10: 420-424 | |
| The lizards of Ecuador, a checklist and key J A Peters (1967) Proc. US. Natl. Mus 119: 1-49 | |
| A review of the South-American iguanid lizard genus Plica R Etheridge (1970) Bull. Brit. Mus. (Nat. Hist.), Zool 19: 237-256 |