Montipora sp. UDUK0000274 is a distinct operational taxonomic unit (OTU) representing an unclassified hermatypic small polyp stony (SPS) coral within the ecologically dominant family Acroporidae. Derived from reef biodiversity exploration initiatives, this specimen serves as a critical model for cnidarian evolutionary genomics. Morphologically, as a member of the genus Montipora, it follows an encrusting, laminar (plating), or submassive growth architecture supported by a porous aragonite coenosteum. Its microscopic corallites are deeply immersed between specialized skeletal ornamentations, and its tissue maintains an obligate endosymbiosis with photosynthetic dinoflagellates (zooxanthellae) for autotrophic carbon assimilation. This specific strain, cataloged under UDUK0000274, was selected for high-throughput single-molecule sequencing by the Wellcome Sanger Institute, resulting in the generation of the highly contiguous, chromosome-level reference genome assembly jaMonSpea1.1 (and its alternate haplotype data). This genomic asset, actively utilized in comparative marine biology, provides fundamental insights into gene prediction, functional annotation, and the molecular pathways governing coral skeletal calcification and climate resilience.