What worm is this?

I purchased some plants from a person who cultivates them in open ponds.The ponds have no filteration but have some live-bearers breeding in them as well. I found some worms that resemble a fluke worm. The worm has a very narrow anterior end, brown in colour and rounds itself when touched. Are these worms harmful? I have attached a photo taken with a cell phone.These are not planaria from my knowledge.

 

a leech maybe?

 

Just a bit different..

They are most likely Planarians
Overall taper shape.
Flat worms, with typical responses to tactile stimuli all behave similarly.

Leeches and Planaria are BOTH flatworms (Platyhelminths)
Depends what your pre-existing nowlwedge of these "bugs" are.

Colour is variable, so is overall shape.

2 "eyespots"
triangular(pointed) "head-end"


They're an indication of an low water quality status, high organic content, and poor maintenance. Uneaten food, Outside conditions ideal for introduction/reproduction, debris all make it an IDEAL HABITAT.

Planaria are non-parasitic flatworms

 

thanks Altum, But this certainly is not a planaria. I will take it to my ex-school and examine it under a microscope to see if it has suckers or barbs.

thanks Altum, But this certainly is not a planaria. I will take it to my ex-school and examine it under a microscope to see if it has suckers or barbs.

 

Planaria vs Leech ?

Glad my reply has made you want to " GO BACK TO SCHOOL"
:idea:
A simple magnifying glass will reveal the "eyespots", especially if in well-lit area, ventral side down, against a glass/bottle.

But yeah, please go ahead and report back your findings.

My experience has shown them to be nearly everywhere in typical stagnant/low-flow aquatic environments
.... not to say you DID'NT find a leech:amazed:

 

The worm is finally recognised as a leech ( zoology dept. UDW)

 

+1 for me