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  1. Coral reefs are incredible hotspots of biodiversity, yet their existence is jeopardized due to drastic climatic events. Investigations of coral morphology using noninvasive approaches are crucial for taxonomic identification and resolving evolutionary relationships. The scleractinian coral genus Madracis is commonly found in Caribbean and western Atlantic reefs, where each of the six Madracis morphospecies has distinct but overlapping depth distributions. Here, we quantified phenotypic traits from macro photographs to understand how morphology varies along the depth gradient in Madracis. In total, macro photographs of 104 colonies at 5, 10, 20, or 40 meters in depth from CuraƧao were analyzed for four morphospecies (M. carmbi, M. decactis, M. pharensis and M. senaria). We counted number of septa and measured intercorallite distance for 15 corallites per colony. The number of septa differed among the four Madracis morphospecies, ranging from an average of 8.66, 9.78, 9.37, and 6.60 septa for M. carmabi, M. decactis, M. pharensis and M. senaria, respectively. Average intercorallite distances were 1.09, 1.92, 1.07 and 1.2 millimeters for M. carmabi, M. decactis, M. pharensis and M. senaria, respectively. Our morphometric investigation using macro-photography is an effective method for quantifying the morphological diversity of living corals. This method allows greater sample sizes, less underwater effort and more importantly, avoids any damage to our already threatened corals. Furthermore, these data can be combined with genomic or ecological data to better understand the ecology and evolution of corals. 
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