I believe it's septa
You can use a program called GParted to add, edit, and delete partitions.
i believe it is called hatchling.
earthworm moves by the hair like projections called setae .
Earthworm
a earthworm
earthworm
Earthworm poop is called castings or vermicast. It is a nutrient-rich fertilizer produced by earthworms as they digest organic matter in the soil.
fertilizer (Earthworm) middens
If it is watertight, it is called a bulkhead.
not its head of course... its called the posterior end.
clitellum