A modern atlas of Nottinghamshire Woodlice
A modern Atlas of Nottinghamshire Woodlice pdf file
 
Despite the near certainty of at least two species of Woodlouse being present in every single square kilometer of the county, the recording of these particularly common and easily accessible invertebrates in Nottinghamshire has always been limited.
 
Even when the great Victorian naturalists were at their peak, collecting and recording our local invertebrate fauna over a century ago, virtually none of them seemed to have any real interest in Woodlice and there were just eight species on the Nottinghamshire list by the turn of this century.

This Atlas attempts to produce up to date distribution maps of all the Woodlice recorded in the county over recent years.

We have not used any historical records in the maps, but have listed all the species we can trace as having been recorded in the county. Waterlice (Asellidae) have not been included, but Asellus aquaticus is abundant in most water bodies throughout Nottinghamshire.

 
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Nottinghamshire's historical Woodlice records

With a general lack of interest in Isopods remaining until 2013, J.W. Carr's book "The Invertebrate Fauna of Nottinghamshire" published in 1916, was all we had available to us, from which to source records for a county atlas of Nottinghamshire Woodlice.

As prolific as most of the Victorian naturalists were, it seems that only C.E. Pearson and J.W. Carr himself, actually did any Woodlice recording in the county. Pearson provided Nottinghamshire's only record of Porcellio dilatatus from a Chilwell greenhouse, while both naturalists also recorded the county's only records of Porcellionides pruinosus from Chilwell, Lowdham and Sherwood Rise in Nottingham.

Between them, Carr and Pearson recorded Armadillidium vulgare (Common Pill Woodlouse), Oniscus asellus (Common Shiny Woodlouse), Philoscia muscorum (Common Striped Woodlouse), Platyarthrus hoffmannseggi (Ant Woodlouse), Porcellio dilatatus, Porcellio scaber (Common Rough Woodlouse) Porcellionides pruinosus (Plum Woodlouse) and Trichoniscus pusillus (Common Pygmy Woodlouse) in Nottinghamshire.

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Androniscus dentiger

Trichoniscoides albidus

Trichoniscus pusillus

Philoscia muscorum

       

Platyarthrus hoffmannseggi

Oniscus asellus

Porcellio dilatatus

Porcellio scaber

       

Porcellionides pruinosus

Armadillidium depressum

Armadillidium nasatum

Armadillidium vulgare

       
Recent Woodlice recording in Nottinghamshire

Aware that no naturalists had made any recent attempts to record Woodlice, we began to make efforts to record them in 2013. Within just a few months, we had added both Androniscus dentiger (Rosy Woodlouse) and Armadillidium depressum as being new to Nottinghamshire in 2013. It must be considered likely, that more species are awaiting discovery. In early 2016 Derek Whiteley added Trichoniscoides albidus to the county list, from sites near Newark and in September 2016 we recorded Armadillidium nasatum from Southwell Garden Centre. With such a small county list, more species must surely be awaiting discovery.

Porcellionides pruinosus and Porcellio dilatatus

A search of the NBN Gateway, provided recent records for both Porcellionides pruinosus and Porcellio dilatatus from over the Nottinghamshire border in Leicestershire at Normanton (Daws, J.), but our research provided no modern Nottinghamshire records. However, both species have recently been recorded (late 2015 and early 2016).

In suitable habitat, Porcellionides pruinosus is probably widespread over much of Nottinghamshire, but Porcellio dilatatus may prove to be more difficult to find. Porcellio dilatatus often associates with Porcellionides pruinosus and the two species are characteristic Woodlice of farms, often found in well-established manure heaps, but also under stones and other farm debris/rubbish.

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References:
Carr, J.W. (1916) The Invertebrate Fauna of Nottinghamshire. Nottingham: J.& H. Bell Ltd.
Carr, J.W. (1935) The Invertebrate Fauna of Nottinghamshire. Supplement. Nottingham: J.& H. Bell Ltd.
Gregory, S. (2009) Woodlice and Waterlice (Isopoda: Oniscidea & Asellota) in Britain and Ireland.  Field Studies Council/Centre for Ecology & Hydrology.
NBN Gateway.
       
       
Species distribution maps
     
ISOPODA - ONISCIDEA - SYNOCHETA - Trichoniscidae   ISOPODA - ONISCIDEA - SYNOCHETA - Trichoniscidae
Androniscus dentiger (Verhoeff, 1908)   Trichoniscoides albidus (Budde-Lund, 1880)
Nottinghamshire distribution: A small (4-5mm) Woodlouse which is found under logs and stones. This beautifully coloured species turned up under well rotted former railway sleepers on the site of the former Bevercotes and Warsop Main Pit Tops in April 2013. Likely to be widespread across Nottinghamshire.   Nottinghamshire distribution: Discovered as new to Nottinghamshire when found at two sites on the River Trent at Farndon near Newark (Whiteley, D.) in January 2016 and more recently found amongst flood debris along banks of the Trent at Stoke Bardolph in February 2017.
 
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ISOPODA - ONISCIDEA - SYNOCHETA - Trichoniscidae   ISOPODA - ONISCIDEA - CRINOCHETA - Philosciidae
Trichoniscus pusillus (Brandt, 1833)   Philoscia muscorum (Scopoli, 1833)
Nottinghamshire distribution: An extremely common and very small Woodlouse, with a length of just 4mm at maximum. These are often found under logs in damp woodland habitats, but it is found in a wide variety of sites, including urban gardens. Almost certainly widespread over most of Nottinghamshire.   Nottinghamshire distribution: A common Woodlouse, usually found in more vegetated areas and regularly encountered on low foliage after dark. A fairly fast moving and well marked species, which has turned up in urban and suburban gardens.
 
     
     
ISOPODA - ONISCIDEA - CRINOCHETA - Platyarthridae   ISOPODA - ONISCIDEA - CRINOCHETA - Oniscidae
Platyarthrus hoffmannseggi (Brandt, 1833)   Oniscus asellus ssp. asellus (Linnaeus, 1758)
Nottinghamshire distribution: A small, but regularly encountered white Woodlouse, which is far more widespread in the county than our distribution map would suggest. It spends its entire life underground in ant nests, with Lasius niger, Lasius flavus and Myrmica rubra, being the commonest host species for this 3-4mm long Woodlouse.   Nottinghamshire distribution: A very common Woodlouse, which is probably present in every single Km square in Nottinghamshire. It is found in all habitats including urban gardens and is one of our most familiar species.
 
     
     
ISOPODA - ONISCIDEA - CRINOCHETA - Porcellionidae   ISOPODA - ONISCIDEA - CRINOCHETA - Porcellionidae
Porcellio dilatatus (Brandt, 1833)   Porcellio scaber (Latreille, 1804)
Nottinghamshire distribution: Nationally described as being rare, Porcellio dilatatus is typically a Woodlouse of synanthropic sites and often found on or around farms. In Nottinghamshire, the only known record was from a greenhouse in Chilwell in the early 1900's and there were no subsequent records, until we found it present in an old milking shed at a Lambley farm in January 2016. Despite seemingly being so rare in the county, it is likely to be present at other Nottinghamshire farms.   Nottinghamshire distribution: An extremely common Woodlouse across the whole of Nottinghamshire and probably present in every square Km of the county. It is found under logs and stones etc, often in large numbers.
 
     
     
ISOPODA - ONISCIDEA - CRINOCHETA - Porcellionidae   ISOPODA - ONISCIDEA - CRINOCHETA - Armadillidiidae
Porcellionides pruinosus (Brandt, 1833)   Armadillidium depressum (Brandt, 1833)
Nottinghamshire distribution: A common and well distributed Woodlouse over most of the UK and presumably in Nottinghamshire, although there have been only two recent records. Found at Tug Bridge Farm near Eakring in December 2015, just a few weeks after one was found at Brackenhurst near Southwell (Heeney, W. and Skinner, M. . Lugg, K. and Lugg, B.). Despite the scarity of county records, Porcellionides pruinosus will very likely be encountered within the manure heaps of many Nottinghamshire farms.   Nottinghamshire distribution: A large Woodlouse with the ability to roll into a slightly open ball when threatened. This characteristic is a useful technique in helping to determine identity, but should not be used alone when confirming identification. Armadillidium depressum was a surprise find on the wall of Carr Bank Park, on Bath Lane in Mansfield, when found tucked into a small eroded piece of stonework and measured 18mm in length. Has been recorded at the same location since. Generally a Woodlouse of the south-west UK.
 
     
     
ISOPODA - ONISCIDEA - CRINOCHETA - Armadillidiidae   ISOPODA - ONISCIDEA - CRINOCHETA - Armadillidiidae
Armadillidium nasatum (Budde-Lund, 1885)   Armadillidium vulgare (Latreille, 1804)
Nottinghamshire distribution: Discovered as new to Nottinghamshire in September 2016, when several specimens were found at the Southwell Garden Centre (Pendleton, T.A. and Pendleton, D.T.). It is often recorded from old quarries, garden centres and brownfield sites and has been well recorded in neighbouring Leicestershire for years (Daws, J.) and should eventually turn up at more sites in Nottinghamshire.   Nottinghamshire distribution: A common Woodlouse which could easily be mistaken for the Pill Millipede (Glomeris marginata). It is usually found under logs or stones, but does not seem to be widespread in the county. However, it can be found in small numbers at Warsop Main Pit Top and at many other sites in the Mansfield area. Armadillidium vulgare rolls into a complete, enclosed ball in defence.
 
     
 
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