Thalassisobates littoralis, Seil Island, Scotland. Photograph copyright Tony Barber
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These are larger animals, variable in appearance but often cylindrical from 2 to 30 mm or more long and with from less than 50 to more than several hundred leg pairs. Their distinctive feature is that most of the apparent trunk segments (diplosegments) bear two pairs of legs. As the animals develop the number of diplosegments and hence of leg pairs increases.

Of the 10,000 or so described species of millipede, four clearly halophilic species are reported from Europe, USA, Far-eastern Russia and Tasmania. In addition, two penicillate or bristly millipedes are also recorded, Polyxenus lapidicola described by Silvestri from the Mediterranean (no subsequent definite records) and a Chilexenus sp. is reported from South Africa by Lawrence (1984).

The total number halophilic diplopod species in the world may be 20 or much more as there are no records at all from western North America, Central & South America and the Caribbean, all of Asia and most of Oceania and littoral diplopods are often difficult to find. Probably there are as yet undescribed, littoral species in collections as well as described species for which no habitat data was recorded at the time.

Other species may occur in supra-littoral sites, some frequently. For instance, Cylindroiulus latestriatus (Curtis, 1845) is characteristically found in such sites all around the coast of Britain and Ireland as well as occurring inland (Lee, 2006).

Brachyiulus pusillus (Leach, 1815)
Scotland; UK; North Coast of Ireland; Wales; Europe...
Cylindroiulus latestriatus (Curtis, 1845)
Wales; North East Coast of England ; Irish Exclusive economic Zone...
    = Allajulus frisius (Verhoeff, 1891) 
    = Allajulus latestriatus (Curtis, 1845) 
    = Cylindroiulus frisius (Verhoeff, 1891) 
    = Cylindroiulus oweni (Bollmann, 1887) 
    = Diploiulus latestriatus (Curtis, 1845) 
    = Julus frisius Verhoeff, 1891 
    = Julus hesperus Chamberlin, 1914 
    = Julus hortensis Wood, 1864 
    = Julus latestriatus Curtis, 1845 (basionym) 
    = Julus luscus Meinert, 1868 
Dolichoiulus tongiorgii (Strasser, 1973)
Habitat: littoral zone
European waters (ERMS scope); Mediterranean Sea...
    = Amblyiulus tongiorgii Strasser, 1973 (basionym) 
Leptoiulus belgicus (Latzel, 1884)
Habitat: This species is either supralittoral or can be found in...
Wales; Europe
    = Julus belgicus Latzel, 1844 (basionym) 
Lissodesmus orarius Mesibov, 2006
Ommatoiulus moreleti (Lucas, 1860)
Habitat: This species is either supralittoral or can be found in...
Tasmania; Iberian Peninsula; Australia
    = Julus moreleti Lucas, 1860 (basionym) 
Ommatoiulus sabulosus (Linnaeus, 1758)
Anglesey; West Coast of England; Wales; Europe
Orinisobates soror Enghoff, 1985
Sakhalin; Kurile Islands
Polyxenus lagurus (Linnaeus, 1758)
Habitat: sometimes in littoral zone
British Isles; North East Atlantic
    = Julus lagurus Linnaeus, 1758 (basionym) 
Polyxenus lapidicola Silvestri, 1903
Habitat: in rocky littoral
Mediterranean Sea; East North Atlantic
Thalassisobates littoralis (Silvestri, 1903)
Habitat: On beaches, under algae, in shingle, etc. Not always ea...
Isle of Man; West Coast of England; East Coast of England...
    = Isobates adriaticus Verhoeff, 1908 
    = Isobates littoralis Silvestri, 1903 (basionym) 
    = Thalassisobates adriaticus (Verhoeff, 1908) (Synonym) 

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