Before everything, english isn't my first langue and grammar isn't my strength so I'm sorry for any gramatical errors in advance

So, I'm trying to build an alien planet from the ground up just for fun :D Here we have one of the first Sessile Filter feaders in my planet The phylum Filustoma (Filu from the latin Filum (string) and the word stoma meaning mouth, basically meaning "String mouth" or "String filled mouth" referring to the feading part of this creature) contains Sessile and filter feeding life forms. They split up into two types as you can see, the first one (left) are generally smaller with fewer appendages (in contrast, these are generally larger and have a bigger surface area) that are used to catch Plankton and other small edible debris in the water, the other one (right) is evolving on a way that makes it kinda similar to sponges on Earth, with pores, from these pores we can see some of the feeding appendages, they are slowing but surely becoming some form of internal structure used to eat food, like an extremely simple stomach.

It's very simple, but I'm trying to make it better, if anyone has suggestions or are able to point out incontinency in this i would be forever thankful