| A | B |
|---|
| Annelida | phylum name for all segmented worms |
| clitellum | swollen band on the exterior of an earthworm which functions during mating to create a cocoon |
| pharynx | muscular throat-like swelling in an earthworm's digestive track for swallowing the soil |
| crop | earthworm's digestive organ for food storage |
| gizzard | earthworm's digestive organ for grinding of its food |
| intestine | this digestive organ in an earthworm occupies about four-fifths of the worm's length |
| aortic arches | name for the five ring-like "hearts" in an earthworm which connect the dorsal blood vessel to the ventral blood vessel |
| epidermis (skin) | an earthworm's main organ of respiration (through which oxygen and carbon dioxide are exchanged) |
| setae | short bristles that project in pairs from an earthworm's skin and are used for traction during movement |
| featherworms (or tubeworms) | a type of marine segmented worms that are sessile and use only their feathery tentacles to capture plankton and get oxygen |
| clamworms (or sandworms) | a type of marine segmented worms that have fleshy, leg-like structures on each segment that help in getting oxygen |
| leeches | some species of this group of segmented worms are parasitic, sucking blood from the skin of their hosts |
| bilateral | type of symmetry in all worms in which there is a definite right side which is a mirror image to its definite left side |
| dorsal side | in animals with bilateral symmetry this is the animal's back or top side |
| ventral side | in animals with bilateral symmetry, this is the animal's belly or underside |
| anterior end | head end of an animal |
| posterior end | tail end of an animal |
| closed circulatory system | blood is contained in vessels (it does not wash freely over the internal organs) |
| esophagus | digestive tube connecting the pharynx to the crop in earthworms |
| ganglia | nerve tissues in segmanted worms |
| nephridia | tube-like excretory structures in segmented worms that filter liquid wastes from the blood |
| septum | thin, internal membrane separating one segment from another in annelids |
