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Any living creature of the Kingdom Animalia constituting multi-celled organisms as well as single-celled organisms lacking chlorophyll and having the ability for spontaneous movement, such as protozoans.

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Animals > Crustaceans

aortic valve

Animals; Crustaceans

Anteroventral opening in heart through which blood is pumped into aorta.


Animals; Crustaceans

Second larval stage; characterized by all body segments and appendages of adult. Leaves brood pouch shortly before or after hatching to the juvenile stage.


Animals; Crustaceans

Copepods for which there is a significant difference in size between the fourth and the fifth thoracic somites of the adult

primary plate

Animals; Crustaceans

One of five principal plates on outer surface of body. Includes single carina as well as paired scuta and terga (and occasionally single rostrum).


Animals; Crustaceans

In circulatory system, large, longitudinal space between digestive tract and ventral nerve cord in which blood collects before entering gills.

seventh limb

Animals; Crustaceans

7th limb (and 2nd trunk/thoracic limb); controversially considered to be and labeled "3rd trunk limb" by some podocopid specialists; use care in reading descriptions.


Animals; Crustaceans

A chemical messenger secreted by an organism, that often elicits a specific response from another individual.