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Unit 18: Biology Part 1 Page 8 of 60

Roundworm: A nematode worm (class Phasmida), esp. a parasitic one found
in the intestines of mammals.

Segmentation: A body plan that has repeated units or segments.

Segmented worm: A worm composed of repeating units (segments).
Sessile filter feeder: Organisms permanently attached and not freely
moving, that feed by filtering organic matter out of the water.

Sexual Dimorphism : having males and females that look very different

Species: Organisms capable of mating with one another.

Spiracles: Openings on the sides of the insect abdomen, through which air is
taken in.

Sponges: Filter-feeding organisms with sac-like bodies, belonging to the
phylum Porifera.

Subphylum : Group of living things in the same phylum with common
characteristics

Swim Bladder : Organ in bony fishes that allows them to regulate their
density

Tapeworms: Intestinal parasites in the phylum Platyhelminthes.

Terrestrial : Living on land
Tetrapod : Having four legs

Valerian Respiration : Respiration through the skin

Vertebrate : Animal with several distinguishing characteristics, including the
presence of a spinal column or backbone of bone or cartilage.

Water vascular system: A network of fluid-filled canals; functions in gas
exchange, feeding, and also in locomotion.

Wingless insects: Insects without wings.

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