Appendage

In invertebrate biology, an appendage (or outgrowth) is an external body part, or natural prolongation, that protrudes from an organism's body (in vertebrate biology, an example would be a vertebrate's limbs). It is a general term that covers any of the homologous body parts that may extend from a body segment. These include antennae, mouthparts (including mandibles, maxillae and maxillipeds), gills, walking legs (pereiopods), swimming legs (pleopods), sexual organs (gonopods), and parts of the tail (uropods). Typically, each body segment carries one pair of appendages.

An appendage which is modified to assist in feeding is known as a maxilliped or gnathopod.

Appendages may become uniramous, as in insects and centipedes, where each appendage comprises a single series of segments, or it may be biramous, as in many crustaceans, where each appendage branches into two sections. Triramous (branching into three) appendages are also possible.There are many appendages.

All arthropod appendages are variations of the same basic structure (homologous), and which structure is produced is controlled by "homeobox" genes. Changes to these genes have allowed scientists to produce animals (chiefly Drosophila melanogaster) with modified appendages, such as legs instead of antennae.

Appendage (EP)

Appendage is Circa Survive's second EP. It was released on November 30, 2010 through Atlantic Records. It contains b-sides from the Blue Sky Noise sessions, as well as a demo of "Sleep Underground". As with Circa Survive's previous three albums and EP, Esao Andrews created the artwork.

Track listing

_{All tracks by Circa Survive}

References