Week 2

Dead Seed shrimp was spotted at the bottom of the aquarium. Its called an Ostocod, its shell was all that was left.

Litonotus

The ingestion region is extended, giving it the appearance of having a long neck. It has two macro nuclei located in the center of the organism. It has a vacuole towards one end of the body that contracts and expands with the water pressure on the outside. Cilia are also present used in aid for movement. Cells are contractable meaning that they can collapse up into a ball.

Tactysoma

Organism has a well-developed dorsal bristles. These bristles are what moves the organism along. It also has cirri which look like cilia but do not aid in movement in anyway. Saw a lot of these organisms. They were present everywhere. The picture to the right is two of them.

Vorticella

This is an organism that is attached to the side of the aquarium by a spasmoneme. A spasmoneme is a stalk like structure that retracts up into a ball when one taps on the aquarium. These organisms are very no are very susceptible to predators because of the stalk that supports them. They consume food by the cilia at the mouth of the organism spinning around in a circle creating a suction effect. The food then moves through to the lower band where the food is placed in food vacuoles.

Philodina

The philodina is a type of rotofer. The organism has cilia on the end of it. These cilia act as motors for the aid in movement. They can be turned on and off. They turn off to conserve energy while feeding. Spotted these two feeding on some algae.