Mystery Bug10-07

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Mystery Bug of the Month

October-07

Gastrotrich. . . . . Indications that you have an older sludge

The gastrotrichs (from Greek gaster "stomach" and thrix "hair") are a phylum of microscopic animals abundant in fresh water and marine environments. Gastrotrich are a group of microscopic wormlike animals that are common in aquatic environments worldwide. There are about 400 known species of gastrotrichs. Gastrotrichs range in length from 0.05 to 4.0 mm (0.002 to 0.16 in).

If you see this in your slide under the microscope, it means you probably are running a pretty old sludge age and are meeting BOD permit levels easily.

These photomicrographs were taken from a wastewater sample. Most of the objectives used were 100 and 400x.

Come take a closer look at the amazing world under the microscope!

	Gastrotrich with Coleps and rotifer

400x	1000x
They wiggle, and twist and turn	The body is covered in a cuticle bearing numerous scales, spines or hooks

It is easy to pick them out by the hairs all over them, but mainly by the distinct shape and the two terminal projections. The gastrotrich two terminal projections with cement glands that serve in adhesion. This is a double-gland system where one gland secretes the glue and another secretes a de-adhesive to sever the connection.

	Reproduction is sexual and hermaphroditic, or parthenogenetic.


	Body has more than two cell layers, tissues and organs.
	It has a nervous system with ganglia.
Bilaterally symmetrical, and vermiform.






Gastrotrichs make up the phylum Gastrotricha, which contains two orders. Animals in the order Macrodasyida are strictly marine, and those in the order Chaetonotida are primarily freshwater.	Scientific classification Kingdom: Animalia Subkingdom: Eumetazoa (unranked) Bilateria Superphylum: Platyzoa Phylum: Gastrotricha Metschnikoff, 1864

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Stay tuned each month

More to come soon!

Enlargements: If you liked these pictures and want to see additional microorganisms check out the pages below.

Amoeba

Flagellates

Free Swimming Ciliates

Eating under the microscope- Dinner time!

What if you do not have a lab or microscope onsite that is capable of performing an analyses of your system?

Find out how Environmental Leverage's lab can perform an analyses of your biomass in your system and make recommendation on how to improve your system.

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