Common lobster  (Homarus gammarus)

Abdomen: In arthropods (crustaceans, insects and arachnids) the abdomen is the hind region of the body, which is usually segmented to a degree. In crustacea (e.g. crabs) the limbs attach to the abdomen; in insects the limbs are attached to the thorax (the part of the body nearest to the head) and not the abdomen. In vertebrates the abdomen is the part of the body that contains the internal organs (except the heart and lungs).
Larvae: Stage in an animal's lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Planktonic: Aquatic organisms that drift with water movements; may be either phytoplankton (plants), or zooplankton (animals).
Sublittoral: A marine zone between the littoral zone (the shallow zone where light reaches the bed, subject to submersion and exposure by tides) and depths of around 200m.

1. National Biodiversity Network Species Dictionary (January, 2003)
   http://www.nhm.ac.uk/nbn/
   
2. Wilson, E. 2002. Homarus gammarus. Common lobster. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. (November, 2002)
   http://www.marlin.ac.uk/species/Homarusgammarus.htm
   
3. Burnie, D. (2001) Animal. Dorling Kindersley, London.
   
4. Fish, J.D. and Fish, S. (1996) A student's guide to the seashore. Second Edition. Cambridge University Press, Cambridge.
   
5. Buczacki, S. (2002) Fauna Britannica. Hamlyn, London.