First record of the non-indigenous isopods Paracerceis sculpta (Holmes, 1904) and Sphaeroma walkeri Stebbing, 1905 (Isopoda, Sphaeromatidae) for Madeira Island

in Crustaceana
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While exploring the presence of non-indigenous fouling species colonizing settlement plates deployed in local marinas in Madeira Island (north-eastern Atlantic Ocean), two non-indigenous species (NIS) of free-swimming crustaceans, Paracerceis sculpta (Holmes, 1904) and Sphaeroma walkeri Stebbing, 1905 (Isopoda: Sphaeromatidae), were detected. Paracerceis sculpta is native to the Pacific Coast of North and Central America and has been introduced into many other regions worldwide. Sphaeroma walkeri is native to the northern Indian Ocean and nowadays is considered one of the most widely ship-transported species globally. Both species were collected in the marina of Funchal, Madeira Island, Portugal, during monitoring surveys in 2015. Moreover, several specimens of S. walkeri were also found in a foreign recreational yacht hull, during a dry dock inspection. These findings suggest that hull fouling is a significant vector for the introductions of marine invertebrates into the Madeira island system.

First record of the non-indigenous isopods Paracerceis sculpta (Holmes, 1904) and Sphaeroma walkeri Stebbing, 1905 (Isopoda, Sphaeromatidae) for Madeira Island

in Crustaceana



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  • View in gallery

    Map of the Madeira Archipelago showing the locations and photos of the four marina study sites: a, Calheta; b, Funchal; c, Quinta do Lorde; d, Porto Santo; e, Dry Dock Inspections (DDI) at RepMaritima shipyard, and photo detail of the foreign recreational yacht from which samples were collected.

  • View in gallery

    Paracerceis sculpta (Holmes, 1904) A, Photo of male specimens collected from Funchal marina on October 2015; B, general view of male specimen; C, diagram of body habitus dorsal (left) α-male morph and (right) female (not found in this study). Drawing by A. Nebra.

  • View in gallery

    Sphaeroma walkeri Stebbing, 1905. A, General view of male specimen collected from Funchal marina on October 2015; B, body habitus dorsal male specimen; C, photo showing the specimens collected from DDI performed on foreign recreational yacht in early November 2015. Drawing by A. Nebra.

  • View in gallery

    World map distribution of Paracerceis sculpta (Holmes, 1904). Native distribution is indicated by (□); introduced locations are indicated by (∙); present collecting site by (⋆) and all literature sources are represented by country/state or island.

  • View in gallery

    World map distribution of Sphaeroma walkeri Stebbing, 1905. Native distribution is indicated by (□); introduced locations are indicated by (∙); present collecting site by (⋆) and all literature sources are represented by country/state or island.

  • View in gallery

    Map-diagram of last journey made by the British yacht from Guernsey, UK, since Algarve, Morocco, Canary Islands: Lanzarote, Gran Canary and lastly La Gomera, before arriving to the marina of Quinta do Lorde, Caniçal, Madeira Island on late October 2015.


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