MolluscaBase taxon details
original description
(of Xerocrassa frater pulaensis Beckmann, 2007) Beckmann, K.-H. (2007). Die Land- und Süsswassermollusken der Balearischen Inseln, 255 pp. [> 8 June]. Hackenheim (ConchBooks). page(s): 97, Abb. 110-111 [details]
original description
(of Helix frater Dohrn & Heynemann, 1862) Dohrn, H. & Heynemann, F. D. (1862). Zur Kenntnis der Molluskenfauna der Balearen. <em>Malakozoologische Blätter.</em> 9: 99-111., available online at https://www.biodiversitylibrary.org/page/15860700 page(s): 103 [details]
basis of record
Bank, R. A.; Neubert, E. (2017). Checklist of the land and freshwater Gastropoda of Europe. Last update: July 16th, 2017. [details] 
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