Substrate
The type of material the organism has available th settle on,
such as rock, sand, or mud.

Subtidal biology
Aterm used to designate the study of organ-isms below  the
lowest low tide.

Saprobic
An organism that derives its nutrition from nonliving orgaoic
material.

Sargassum
A major type of algae found in warmer waters.

Silica
A compound similar to glass. Found in diatoms.

Stipes
The  portion of a kelp plant between the blade and the base.

Spicules
Smallest parts of the supportive structure or skeleton of the
sponges.

Scyphozoa
Jellyfish belong to thes class.

Scaphopoda
Class name of the tusk shells.

Swim bladder
A gas-filled organ found in most bbony fish, but lacking in
sharks and rays, that acts as a buoyancy control device to
keep the animal neutrally buoyant in the water so it will not
sink or float.

Sirenia
Order that is the least known of the sea mammals, containing
the manatees, sea cows, and dugongs.
Spiracle
Hole in the top of the head of the sharks and rays, used
totake in water for respiration in bottom dwellers.

Squamata
Oeder of the sea snakes.

Spring tides
Ocern tides that occur at full and new moon. the term has
nothing to do with season. spring tides
have the goeatest range from high tide to low tide in their
area.

Somatic cells
All cells of an organism except the germ cells.

Spermatogenesis
Formation of sperm; meiosis.

Stylatula spp.
Sea pen.