Arrhis phyllonyx is a compact, shrimp-like crustacean that can grow to around 2cm in length. It is pale orange in colour. A detailed examination would reveal it has two pairs of antennae and that its body is composed of 13 segments plus a tail and 16 legs.
Arrhis phyllonyx inhabits deep offshore waters ranging in depth from 10-1,000m.
Males and females typically reach maturity in their third year, after shedding their shells up to 14 times. Adults breed only once.
Arrhis phyllonyx was designated as a priority species under the UK Biodiversity Action Plan in 2007.
In the UK the species is generally present in more northern waters. It has been found off the south coast of Orkney, and off Northern Ireland.
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