A small, rigid plate covering the skin of a fish, providing protection and reducing water resistance.

écaille

Fixed in one place and not capable of movement.

sessile

An organism that prefers or thrives in shaded or low-light environments.

sciaphile

A structure produced by the male that contains sperm and allows it to be transferred to the female during reproduction.

spermatophore

Male reproductive cell that is motile and capable of fertilizing an egg.

spermatozoïde

A small, needle-like structure that forms part of the skeleton of sponges, providing support and protection.

spicule

A fibrous protein that forms the flexible skeleton of certain sponges.

spongine

The stalk or stem that supports the cap of a mushroom or the frond of certain plants and algae.

stipe

Located in or characteristic of regions immediately north or south of the tropics, with warm, often humid climates.

subtropical

An organism that prefers or thrives in well-lit or sunny environments.

photophile