Glossary: W

"whole limb" jaws

Entire third appendage forms jaws. Synapomorphy of the Insecta+Myriapoda.


A shallow, usually sharply defined depression in a desert region, frequently comprising a bed or valley of a stream that is usually dry except during the rainy season and that often forms an oasis.


A maze of passageways.


A term applied to certain species of wild pigs. The warty pigs are so-called because the adult males typically develop three pairs of warts: on the cheek swellings, on the jaw angle, and above the canine root flanges.

water vascular system

A network of ducts filled with water that is used to move echinoderm tentacles and tubefeet via changes in water pressure. Synapomorphy of the Helicoplacopids+Camptostromata+Crinoidea+Asteroidea+Ophiuroidea+Echinoidea+Holothuroidea.


The time when a young animal stops nursing and begins utilizing other food.

  1. a structure of delicate, threadlike filaments spun by spiders, some mites, or certain insects;
  2. a membrane or fold of skin connecting the toes, as of certain amphibians, birds, and mammals;
  3. the barbs on each side of the shaft of a bird's feather; a vane;
  4. a latticed or woven structure.

Land that has lots of water in it. The land is so soggy there isn't much oxygen in the soil. Wetlands often are found between bodies of water and land, and have plants and animals specially adapted to living in or near water.

lowland areas satured with water, characterized by low soil oxygen.


maximum length across the span of the wings of a flying animal