Raw data for publication 'A phenomics approach reveals interspecific differences in integrated developmental responses to chronic elevated temperatures', Journal of Experimental Biology (2023) 226, jeb245612. doi:10.1242/jeb.245612. Developmental_Event_Timings.csv - Raw data for the timings of development of Lymnaea stagnalis, Radix balthica and Physella acuta maintained at 20 and 25C, recorded by manual observation from video of developing embryos. Data are recorded as absolute timings, and relative timings normalised between the 4-cell stage and hatching. EPT_Data.csv - Time series of frequency specific EPT data binned at 0.1Hz increments for embryos of Lymnaea stagnalis, Radix balthica and Physella acuta maintained at 20 and 25C, normalised by relative developmental time. EPT_data_by_physiological_window.csv - Frequency specific EPT data binned at 0.1Hz increments, and averaged across 4 key physiological windows in development (ciliary driven rotation, muscular crawling, cardiovascular function and radula function) for embryos of Lymnaea stagnalis, Radix balthica and Physella acuta maintained at 20 and 25C. Total_energy_data.csv - Time series of total energy data for embryos of Lymnaea stagnalis, Radix balthica and Physella acuta maintained at 20 and 25C, normalised by relative developmental time.