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We confirm the detection of 3 groups in the Lynx supercluster, at z~1.3, andgive their redshifts and masses. We study the properties of the group galaxiesas compared to the central clusters, RXJ0849+4452 and RXJ0848+4453, selecting89 galaxies in the clusters and 74 galaxies in the groups. We morphologicallyclassify galaxies by visual inspection, noting that our early-type galaxy (ETG)sample would have been contaminated at the 30% -40% level by simple automatedclassification methods (e.g. based on Sersic index). In luminosity selectedsamples, both clusters and groups show high fractions of Sa galaxies. The ETGfractions never rise above ~50% in the clusters, which is low compared to thefractions observed in clusters at z~1. However, ETG plus Sa fractions aresimilar to those observed for ETGs in clusters at z~1. Bulge-dominated galaxiesvisually classified as Sas might also be ETGs with tidal features or mergerremnants. They are mainly red and passive, and span a large range inluminosity. Their star formation seems to have been quenched beforeexperiencing a morphological transformation. Because their fraction is smallerat lower redshifts, they might be the spiral population that evolves into ETGs.For mass-selected samples, the ETG fraction show no significant evolution withrespect to local clusters, suggesting that morphological transformations occurat lower masses and densities. The ETG mass-size relation shows evolutiontowards smaller sizes at higher redshift in both clusters and groups, while thelate-type mass-size relation matches that observed locally. The group ETG redsequence shows lower zero points and larger scatters than in clusters, bothexpected to be an indication of a younger galaxy population. The estimated agedifference is small when compared to the difference in age at different galaxymasses.

Early-type galaxies at z = 1.3. I. The Lynx supercluster: cluster and groups at z=1.3. Morphology and color-magnitude relation