The aboral pore of hydra: evidence that the digestive tract of hydra is a tube not a sac

From the Springer article: The aboral pore of hydra: evidence that the digestive tract of hydra is a tube not a sac by: Shimizu, Hiroshi; Takaku, Yasuharu; Zhang, Xiaoming; Fujisawa, Toshitaka; Movie 2 Ejection of digested materials through the aboral pore (MOV 301 kb) Journal: Development Genes and Evolution Vol. 217 Issue 8 DOI: Published: 2007-08-02