posted on Jan, 19 2012 @ 04:01 PM
Originally posted by Indellkoffer
Originally posted by Chewingonmushrooms
Isn't fungi on a class on it's own as well? I know it isn't classified in the plant kingdom. Any mycellum experts here?
Fungi are a separate kingdom. There are five kingdoms of living things: Monera Kingdom, the Protist Kingdom, the Fungi Kingdom, the Plant Kingdom,
and the Animal Kingdom. It's too complex for Monera, and too many cells (I think) for Protist. Will they start a new kingdom? That's a pretty
difficult decision -- they first have to find out exactly where it fits in the web of life.
Actually Mesodinium chamaeleon
belongs to the ciliate and thus also to the protozoans. Depending on which classification system you use this
species is either an animal (classical system), an eukaryote (Three-domain system) or a protist (if you use the 5 kingdom-classification-system). .
Many species of ciliates and other protists are mixotrophic. This means, they can use both photosynthesis and heterotrophically nourishment (feeding
from the substance of other organisms) as energy source. Other examples are Euglena
Some higher animals like sea slugs, corals and flatworms also add photosynthesis to their normal heterotrophic nourishment. They use single-cell algae
as endosymbionts. These endosymbionts are called zooxanthellae
It is not uncommon for a single-celled organism to switch between different feeding methods. Often such a switch is linked to different stages of its
life-cycle. If I understood the article correctly, the novelty seems to be, that Mesodinium chamaeleon
first devoures other single-celled
organisms (algae). The algae are dissolved in its food vacuole. But not the whole algae are digested. The chloroplasts (organelles which are
responsible for the photosynthesis) and some other structures remain intact in the food-vacuole and from then on provide energy for Mesodinium
Studies on the Genus Mesodinium I: Ultrastructure and Description of Mesodinium chamaeleon n. sp., a Benthic Marine Species with Green or Red
by Øjvind Moestrup1, Lydia Garcia-Cuetos, Per Juel Hansen, Tom Fenchel
We provide here the description of a new marine species that harbors green or red chloroplasts. In contrast to certain other species of the genus,
Mesodinium chamaeleon n. sp. can be maintained in culture for short periods only. It captures and ingests flagellates including cryptomonads. The prey
is ingested very rapidly into a food vacuole without the cryptomonad flagella being shed and the trichocysts being discharged. The individual food
vacuoles subsequently serve as photosynthetic units, each containing the cryptomonad chloroplast, a nucleus, and some mitochondria. The ingested cells
are eventually digested. This type of symbiosis differs from other plastid-bearing Mesodinium spp. in retaining ingested cryptomonad cells almost
intact. The food strategy of the new species appears to be intermediate between heterotrophic species, such as Mesodinium pulex and Mesodinium pupula,
and species with red cryptomonad endosymbionts, such as Mesodinium rubrum.
edit on 19-1-2012 by Drunkenshrew because: (no reason given)