Glossary of Technical Terms 



AESTHETASC. Thin-walled sensory seta usually found on flagellum of 



antennule 

 AMBULATORY (as applied to pereopods). Used for walking. 

 ANCHIALINE. An aqueous habitat near the sea; referring to saltwater or brackish 



pools fluctuating with the tides, but with no surface connection to the sea. 

 ANGULATE. Having an angle or an angular shape. 

 ANTENNA. Paired appendage of the third cephalon segment; sometimes referred 



to as antenna 2. 

 ANTENNULE. Paired appendage of the second cephalon segment; sometimes 



referred to as antenna 1. 

 APICAL. Relating to the apex or tip. 

 APPENDAGE. An articulated structure used for feeding, locomotion, sensory 



reception, e.g., mouthparts, antennae, pereopods, pleopods, uropods. 

 ARTICLE. A single section of an appendage, with an articulation at one or both 



ends. 

 BASIS. Article of appendage adjoining coxa proximally, and carrying endopod 



distally, i.e., article 2 of pereopod. 

 BIARTICULATE. Composed of two articles. 

 BIDENTATE. Having two teeth. 

 BIFID. Divided into two lobes or parts by a cleft. 

 BILOBED. Composed of two lobes. 

 BIRAMOUS. Composed of two rami or branches. 

 BIUNGUICULATE. Having two claws, as in a bifid dactylus. 

 CARINA. A keel, or an acute ridge. 



CARINATE. Having one or more carinae or acute ridges. 

 CARPOCHELATE. Having a chela or pincerlike structure formed by the seventh 



(dactylus) and fifth (carpus) articles of an appendage. 

 CARPUS. Article 5 of pereopod. 

 CEPHALON. Anterior region of body or head; more correctly the cephalothorax 



in isopods, as the first pereonal segment is usually fused with the head. 

 CHELA. Distal pincerlike part of appendage, often formed by a mobile and an 



immobile finger. 

 CHELATE. Having a chela; modified to form a pincer. 

 CLAVATE. Club shaped; having one end thickened. 

 CLYPEUS. Platelike structure of cephalon, anterior to upper lip or labrum, 



sometimes fused with frontal lamina. 

 CONGLOBATE. Able to roll up into a ball, as in some sphaeromatid and 



oniscidean isopods. 

 CONSPECIFIC. Belonging to the same species. 

 CONTIGUOUS. Touching. 



