Miguel Ibáñez, Klaus Groh, María Alonso, Carolina Castillo und Yurena Yanes: The subgenus Monilearia (Lyrula) Wollaston, 1878 (Gastropoda: Helicoidea: Cochlicellidae) from Lanzarote and Fuerteventura (Canary Islands), with the description of Monilearia (Lyrula) tubaeformis sp. nov. Zootaxa, 1320: 29-41, Auckland 2006 Abstract (PDF; 14 kB)
Miguel Ibáñez, María R. Alonso, Klaus Groh und Rainer Hutterer: The Genus Obelus Hartmann, 1842 (Gastropoda, Pulmonata, Helicoidea) and its Phylogenetic Relationships. Zoologischer Anzeiger, 242: 157–167, Amsterdam & Jena 2003 ISSN0044-5231