Pfeifer R, Berking S
Zoologisches Institut, Universität zu Köln, Germany.
Int J Dev Biol. 1995 Apr;39(2):395-400.
Thecocodium quadratum (Werner, Jber. Biol. Anst. Helgoland, 1965) is a colonial hydroid which produces 2 different types of polyps: gastrogonozooids and dactylozooids. The mouthless dactylozooids bear tentacles and catch the prey, which is then taken over and swallowed by the gastrogonozooids which have no tentacles. It is obvious that for a colony to survive both polyps must exist simultaneously arranged in a certain spatial pattern. Our experiments indicate that the formation of polyps in a growing culture is governed by at least 3 principles: (1) short range inhibition between polyps irrespective of their differentiation; (2) long range specific inhibition between gastrogonozooids; and (3) long range supporting influence (lateral help, Meinhardt, H., Models of Biological Pattern Formation, 1982) between gastrogonozooids and dactylozooids.
方形膜口螅（Werner，《黑尔戈兰生物研究所学报》，1965年）是一种群体水螅，它产生两种不同类型的息肉：胃生殖体和指状体。无口的指状体长有触手并捕捉猎物，然后猎物被没有触手的胃生殖体接管并吞食。显然，为了使群体生存，两种息肉必须以某种空间模式同时存在。我们的实验表明，在生长培养物中息肉的形成至少受三个原则支配：（1）息肉之间的短程抑制，与它们的分化无关；（2）胃生殖体之间的长程特异性抑制；（3）胃生殖体和指状体之间的长程支持影响（侧向帮助，Meinhardt，H.，《生物模式形成模型》，1982年）。
