H.įollowing the first three years of survey operations (2008 February-2010 May see Driver et al. VizieR Online Data Catalog: Galaxy And Mass Assembly ( GAMA): DR2 (Liske+, 2015) The G3Cv1 catalogue will be made publicly available as and when the relevant GAMA redshifts are made available at. Further studies using a variety of galaxy formation models are required to confirm their exact origin. These two differences are most likely due to limitations in the physics included of the current GAMA lightcone mock. Additionally, despite exceptionally good local spatial completeness, G3Cv1 contains significantly fewer compact groups with five or more members, this effect becoming most evident for high multiplicity systems. However, we do find a noticeable deficit in the number of high multiplicity groups in GAMA compared to the mocks. The similarities of the mock group catalogues and G3Cv1 are multiple: global characteristics are in general well recovered. G3Cv1 contains 14 388 galaxy groups (with multiplicity ≥2), including 44 186 galaxies out of a possible 110 192 galaxies, implying Ëœ40 per cent of all galaxies are assigned to a group. Recovered group properties are robust to the effects of interlopers and are median unbiased in the most important respects. Our algorithm has been tested extensively on one family of mock GAMA lightcones, constructed from Λ cold dark matter N-body simulations populated with semi-analytic galaxies. Using the complete Galaxy and Mass Assembly I ( GAMA-I) survey covering Ëœ142 deg2 to rAB= 19.4, of which Ëœ47 deg2 is to rAB= 19.8, we create the GAMA-I galaxy group catalogue (G3Cv1), generated using a friends-of-friends (FoF) based grouping algorithm. Galaxy and Mass Assembly ( GAMA): the GAMA galaxy group catalogue (G3Cv1)