Vocabulary
Roundworms, or ____, have long, slender, nonsegmented bodies that taper at both ends.
Nematodes
This group of crustaceans are found as plankton in both marine and freshwater environments; they have no carapace and only one eye on top of their head.
Copepods
Bivalves
Another name for segmented worms.
Annelids
The largest group of arthropods.
Insects
Earthworms have bristles called ___ attached to segments on their bodies to aid in locomotion.
Setae
Crustaceans are often equipped with at least one claw or __.
Chela
These mollusks are designed to crawl on their stomachs; this group includes snails, slugs, and cowries.
Gastropod
Planarians
Approximately how many species of sponges are recognized today?
5000
This term means "head foot."
Cephalopod
A group of small crustaceans with shortened antennae and leaf-like legs; common species include brine shrimp and water fleas.
Branchiopods
The octopus belongs to what group of mollusks?
Cephalopods
These are largely considered the most abundant animals; some scientists estimate that 4/5 of animals fall into this category.
Nematodes
Echinoderms use ___; unique suction devices, to help them move about.
Tube Feet
This group of spiders is known for their large size and formidable appearance; a well-known member of this group is the tarantula.
Mygalomorph
Crayfish lay about ___ eggs at a time.
100
____, which are all marine animals, include star fish and sand dollars.
Echinoderms
The most common parasitic annelid.
Leech
This is the only multicellular animal without a nervous system.
Sponges
This arachnid is native to North America and can be recognized by the dark, violin-shaped marking on its cephalothorax.
Brown Recluse
Freshwater shrimp and sand fleas belong to what group of crustaceans?
Amphipods
This group of animals have slender tentacles extending from its body to aid in seizing prey; this group includes jellyfish and corals.
Coelenterates
Flatworms are also called ___.
Platyhelminths
The jellyfish has what coelenterate body form?
Medusa