Abstract
A new species of Periclimenaeus is described from Madeira Island, in the northeastern Atlantic Ocean. It is closest to P. pearseiHolthuis, 1951 from the western Atlantic, but it can be distinguished by the shape of rostrum, the size of exopod in relation to endopod in third maxilliped, the relation between the carpus and the chela of pereiopod 1, the relative size of second pereiopod minor chela, and the number of setae on appendix masculina. This is the first record of the genus Periclimenaeus in the eastern Atlantic.
Highlights
The genus Periclimenaeus Borradaile, 1915 is the second most speciose genus within Pontoniinae with most of its members occurring in tropical waters (Bruce, 2001)
Periclimenaeus pearsei specimens where presented with all appendices separated from the body parts and the female holotype was damaged in a way that prevented us to measure total length
Periclimenaeus aurae is the first species of the genus to be recorded in the northeastern Atlantic
Summary
The genus Periclimenaeus Borradaile, 1915 is the second most speciose genus within Pontoniinae with most of its members occurring in tropical waters (Bruce, 2001). Several caridean shrimp genera are known to be amphi-Atlantic, occurring in western Atlantic tropical waters and the Macaronesian Islands (Cinetorhynchus Holthuis, 1995, Janicea Manning & Hart, 1984, Tuleariocaris Hipeau-Jacquotte, 1965 and Thor Kingsley, 1878) (d’Udekem d’Acoz, 1999, 2001), the genus Periclimenaeus has not been previously recorded in the eastern Atlantic. Based on a more in depth examination, we concluded that this specimen was erroneously identified and represented an undescribed species of Periclimenaeus. The present work reports the first record of the genus Periclimenaeus in the eastern Atlantic, provides a detailed morphological description of a new species in the genus, Periclimenaeus aurae and a re-description of the closest species, P. pearsei Holthuis, 1951, based on the observation of the holotype from the National Museum of Natural History, Smithsonian Institution, Washington DC, USA
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