Geoglomeris subterranea Verhoeff, 1908

Synonyms

Geoglomeris jurassica Verhoeff, 1915
Stygioglomeris crinata Brölemann, 1913

Status

GB IUCN status: Least Concern
GB rarity status: Nationally Scarce

Identification

A small pallid pill-millipede rolling into a ball of no more than 3mm in diameter. The body typically appears smooth, lacking the obvious tubercles seen in Trachysphaera lobata or Adenomeris gibbosa.

J.P. Richards
J.P. Richards

Distribution and Habitat

This is a soil-dwelling species that has been collected from widely scattered locations across Britain and Ireland. Kime (2004) describes the species as a strict calcicole and 96% of the British records are from calcareous soils. It appears to be absent from large areas of south west England, north and west Scotland and Wales where the geology produces mainly acidic soils. Although it can be common in limestone areas, it has not been found in many apparently suitable sites. A strong association with calcareous soils is not evident from analysis of environmental data due to the small number of records for the species. Analysis of habitat data suggests the millipede has a strong association with excavation sites, especially old chalk and limestone quarries. In Europe there are records from Austria, Belgium, France, (Kime, 2004) Germany and Switzerland (Kime, 2001). Bocock, Heath and Blower (1973) found that this millipede lives mainly in the top 10-20 centimetres of soil, where population densities of up to 128 per square metre were recorded, but may migrate deeper or to other sheltered locations in exceptionally dry or cold conditions. It is a difficult species to locate by hand searching. Branquart and Gaspar (1996) have shown that Berlese extraction is the only method of sampling populations successfully. Most individuals appear to mature in their third year (Blower, 1985) and adults can be found throughout the year. As no male specimens have been collected it is assumed that the British populations of G. subterranea are parthenogenetic.

Distribution

Reference

Blower, J.G. 1985. Millipedes. Synopses of the British Fauna (New Series), No. 35. London: Linnean Society.

Bocock, K.L., Heath, J. & Blower, J.G.B. 1973. Some observations on the biology of the millipede Geoglomeris jurassica Verhoeff, 1915. Journal of Natural History, 7, 691-697.

Branquart, E. & Gaspar, C. 1996. Étude comparative des techniques d’échantillonage des macroarthropodes saprophages (Isopoda & Diplopoda). Acta Myriapodologia. Mémoires du Muséum national d’Histoire naturelle, Paris,169: 485-492.

Kime, R.D. 2004. The Belgian Millipede Fauna (Diplopoda). Bulletin de l’Institut royal des Sciences Naturelles de Belgique, Entomologie, 74, 35-68.

Kime, R.D. 2001. The continental distribution of British and Irish millipedes, part 2. Bulletin of the British Myriapod and Isopod Group, 17, 7-42.

idBmigTaxa

32

BRC Code

Mil_179