Related Words

Phylum: The broadest taxonomic category within kingdoms (pl.: phyla).

Salps: A group of pelagic tunicates (phylum Urochordata), either colonial or solitary, with buccal and atrial siphons on opposite sides of the body

Radiolaria: Protistan phylum, whose members are planktonic and secrete an often elaborate siliceous test

Scyphozoa: The true jellyfish, members of the phylum Cnidaria

Species: One or more populations of interbreeding or potentially interbreeding organisms that are reproductively isolated in nature from all other organisms. Populations of individuals capable of int . . . View Full Definition

Araneology: The branch of zoology that treats only of the spiders. Arthropod.The jointed-legged animals, such as centipedes, millipedes, insects, crustaceans, spiders, scorpions, and many other less wel . . . View Full Definition

Porifera: The phylum comprising the sponges.

Comb Jellies: Members of the phylum Ctenophora, a group of gelatinous forms feeding on smaller zooplankton

Planaria: Small free-living fiatworms (Phylum Platyhelminthes) with bilateral symmetry and cephalization. The freshwater type is often used as an experimental organism.

Notochord: In chordates, a cellular rod that runs the length of the body and provides dorsal support. Also, a structure of mesoderm in the embryo that will become the vertebrae of the spinal column. Th . . . View Full Definition