Can anyone help me identify this please?

[Angelfish]

My neighbour had a new pond dug in her garden. It contains fish and waterlilies, at this stage. However we found this creature sitting at the edge. It can move with a black sucker like end. I did wonder if it was a snail with some type of growth on its shell. We have taken it out of the pond in case it could endanger the fish.
Does anyone know what it could be?

 

[Mmathis]

Can you describe its size?

 

[Angel]

Can you describe its size?

looks to be about the size of a gold ball my guess

 

[Mmathis]

looks to be about the size of a gold ball my guess

Maybe, but there’s nothing in the picture to give an accurate perspective.

 

[Angel]

Maybe, but there’s nothing in the picture to give an accurate perspective.

it looks like it is in a canning / mason jar by the marking on the right side.

 

[poconojoe]

Interesting. I don't know what it is, but I'd like to stick around to see if someone can identify it.

 

[RobAmy]

Looks like the lock nest monster laid a egg in the pond

 

[Stephen Noble]

Perhaps some sort of caterpillar larva? Can't tell how large it is from your image but that is my guess since it was not underwater and in a freshwater environment.
Stephen

 

[GBBUDD]

LOOKS LIKE A BLEACHED OUT PIECE OF MOSS

 

[myswtsins]

My neighbour had a new pond dug in her garden. It contains fish and waterlilies, at this stage. However we found this creature sitting at the edge. It can move with a black sucker like end. I did wonder if it was a snail with some type of growth on its shell. We have taken it out of the pond in case it could endanger the fish.
Does anyone know what it could be?

Wow, that's a new one to me and completely fascinating! I have no idea but to clarify, you say it moves? was found underwater? And it's size is?

 

[Angelfish]

Can you describe its size?

It's about the size of a golf ball. About 6cm across.

 

[Angelfish]

Perhaps some sort of caterpillar larva? Can't tell how large it is from your image but that is my guess since it was not underwater and in a freshwater environment.
Stephen

It was found at the edge of the pond, but seems to live happily in water. We put it in a glass jar with pond water and vegetation. It can climb up the side of the jar. It is about the size of a golf ball, about 6cm across.

 

[MitchM]

Need more pictures.
Can you show a picture of the sucker like mouth and the animal's underside?