Woodlouse spider
Overview
 
The woodlouse spider is a species of spider
Spider
Spiders are air-breathing arthropods that have eight legs, and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms...

 that preys exclusively upon woodlice
Woodlouse
A woodlouse is a crustacean with a rigid, segmented, long exoskeleton and fourteen jointed limbs...

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Other common names refer to variations on the common name of its prey. These are woodlouse hunter, sowbug hunter, sowbug killer, pillbug hunter and slater spider.
Female specimens are 11–15 mm long while males are 9–10 mm.
They have a dark-red cephalothorax
Cephalothorax
The cephalothorax is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. The word cephalothorax is derived from the Greek words for head and thorax...

 and legs, and a shiny (sometimes very shiny) yellow-brown abdomen
Abdomen
In vertebrates such as mammals the abdomen constitutes the part of the body between the thorax and pelvis. The region enclosed by the abdomen is termed the abdominal cavity...

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