Daphnia longicephala (image) Society for Experimental Biology Share Print E-Mail Caption Undefended Daphnia longicephala (left) is compared with the defended phenotype (right). The defended phenotype has a large crest as well as elongated tail spines in response to chemical cues from the backswimmer Notonecta glauca. Credit Dr Linda Weiss Usage Restrictions Freely available with attribution to Dr Linda Weiss. 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.