nightfly's picture

Lawn shrimps.

Observed: 20th April 2012 By: nightflynightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebratesnightfly’s reputation in Invertebrates
20 April 12 (14)
20 April 12 (9)
Species interactions

No interactions present.


nightfly's picture

Just offering that link again

Just offering that link again as it is buried in my text above:


stevegregory's picture

Arcitalitrus dorrieni

Nightfly - a year waited, but... Yes these are the lawn shrimp, aka woodhopper, aka landhopper(Amphipoda; Talitridae; Arcitalitrus dorrieni). In Britain there is no NATIVE Amphipods that are terrestrial (i.e. found well away from water courses or well above the coastal high tide mark). There are two introduced species that can be found inland. Ochestia cavimana will penetrate far inland along major watercourses, but is semi-terrestrial and rarely far from water. It is pale brown and the male is distinctive in having 'boxing' gloves on its 2nd pair of legs. A. dorrieni (mistaken called A. sylvaticus in the past) is truly terrestrial and can be found far from water, but usually where the ground is damp. It is much darker than Ochestia, and the male 2nd legs look the same as the females. Other species are found in 'tropical' glasshouses, but that's another story. Steve

nightfly's picture

Hi Steve, Another year

Hi Steve,

Another year waited somehow? Sorry for the belated response and thanks so much for the info. These things are now very well established in my back yard and they are very common. They were not present in the 80s and prob much of if not all of the 90s. I am only familiar with them in more recent years.


stevegregory's picture

Hi Cathal, Useful and

Hi Cathal,

Useful and interesting information. Rather confirms the idea that they are spreading.

best wishes

Eskling's picture

So many of them!


I'm fed up with these things in the garden! Every time I lift a pot or leaves, etc, there are dozens of them leaping about. Just hope the local bird population develops a taste for them.


nightfly's picture

Thats just the same as here

Thats just the same as here Philip but it hasnt always been so. It looks like they are here to stay.