Genus-level revision of the Alycaeidae (Gastropoda, Cyclophoroidea), with an annotated species catalogue Author Pall-Gergely, Barna Plant Protection Institute, Centre for Agricultural Research, Herman Otto ut 15, Budapest, H- 1022, Hungary https://orcid.org/0000-0002-6167-7221 pallgergely2@gmail.com Author Sajan, Sheikh Zoological Survey of India, Prani Vigyan Bhawan, M Block, New Alipore, Kolkata 700053, West Bengal, India & Wildlife Institute of India, Chandrabani, Dehradun 248 002, Uttarakhand, India https://orcid.org/0000-0002-2785-6824 Author Tripathy, Basudev Zoological Survey of India, Prani Vigyan Bhawan, M Block, New Alipore, Kolkata 700053, West Bengal, India Author Meng, Kaibaryer National Zoological Museum of China, Institute of Zoology, Chinese Academy of Sciences, Beijing, China Author Asami, Takahiro Department of Biology, Shinshu University, Matsumoto 390 - 8621, Japan https://orcid.org/0000-0001-5706-0272 Author Ablett, Jonathan D. Mollusca Section, Invertebrates Division, Department of Life Sciences, The Natural History Museums, London SW 7 5 BD, United Kingdom text ZooKeys 2020 981 1 220 http://dx.doi.org/10.3897/zookeys.981.53583 journal article http://dx.doi.org/10.3897/zookeys.981.53583 1313-2970-981-1 5194AAC86B8A473F8A41470A60182A0B 7C44C797C4125A71BAE032A55E6FA5DC Family Alycaeidae W. T. Blanford, 1864 Alycaeinae W.T. Blanford, 1864: 465. Alycaeinae - Godwin-Austen, 1886: 186. (subfamily of Cyclophoridae ); Bouchet and Rocroi 2005 : 23, 248; Bouchet et al. 2017 : 28, 340. (subfamily of Cyclophoridae ) Alycaeidae - Kobelt & Moellendorff , 1897: 146; Egorov 2013 : 33. Diagnosis. Shell with a complex gas exchange system consisting of a common external sutural tube and several extremely narrow, perpendicularly running microtunnels, formed by the outermost shell layer ( Pall-Gergely et al. 2016 ). Bursa copulatrix connecting to lateral side of ovarium. Remarks. In the past this group has been treated as a subfamily of the Cyclophoridae , and as a family of its own right. The complex gas exchange system, combined with the unique position of the bursa copulatrix (both are important synapomorphic characters), seems to justify the distinction of this group as an independent family.