Embryo Development (Image) (image) University of Plymouth Share Print E-Mail Caption Increased temperatures cause increased rates of development and an altered developmental trajectory in the embryonic stages of this pond snail. Here embryos are four days into their development and show marked differences in appearance, particularly between 25 and 30°C. At 30°C embryos sustain a dramatic increase in heart rate, but a significant overall reduction in movement. Credit Oliver Tills/University of Plymouth Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.