The organization of the muscular system of Metridium senile.

Phases of activity in the sea-anemone, Metridium senile (L.), and their relation to external stimuli.

We have shown in a previous paper (Batham & Pantin, 19506) that the sea-anemone Metridium senile exhibits continual very slow muscular activity. It is most evident in the changes of shape of the column caused by the reciprocal contractions of the circular muscle sheet, and of the longitudinal parietal musculature which runs at the junction of each mesentery with the body wall. This inherent act...

Structural Comparison of Cnidea Present on Three Structures of Metridium Senile

Previous studies have suggested that feeding tentacles, catch tentacles and acontia threads of Metridium senile differ not only in structure at the eye level, but also in the types of cnidea they possessed. However, specifics regarding these differences had been lacking. I predicted that differences within cnidea types and distribution as each of these three cnidea baring structures are used di...

The Effects of Ions and Drugs on Neuro- Muscular Preparations of Sea Anemones I. on Preparations of the Column of Calliactis and Metridium

The Alkaloid Ageladine A, Originally Isolated from Marine Sponges, Used for pH-Sensitive Imaging of Transparent Marine Animals

The brominated pyrrole-imidazole Ageladine A was used for live imaging of the jellyfish (jellies) Nausithoe werneri, the sea anemone Metridium senile and the flatworm Macrostomum lignano. The fluorescence properties of Ageladine A allow for estimation of pH values in tissue and organs in living animals. The results showed that Nausithoe werneri had the most acidic areas in the tentacles and clo...

Sensitivity to Light in the Sea Anemone Metridium Senile (l.)

1. The reaction time of the photosensitive response of Metridium was found to be composed almost entirely of a sensitization period. If a latent period exists, it is too short to be detected by the methods used and is probably less than a second in duration. The length of the reaction time, therefore, was used as a measure of the radiant energy necessary at any intensity to elicit a response. 2...