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Type: Monograph
Published: 2021-03-04
Page range: 1–191
Abstract views: 462
PDF downloaded: 291

Jassa (Crustacea: Amphipoda): a new morphological and molecular assessment of the genus

Canadian Museum of Nature, P.O. Box 3443, Stn. D, Ottawa, Ontario, Canada, K1P 6P4.
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Department of Functional Ecology, Am Handelshafen 12, 27570, Bremerhaven, Germany. Federal University of Paraná, Laboratório de Estudos de Cnidários e Comunidades Incrustantes of Paraná, 81531-980 Curitiba, Brazil.
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Department of Functional Ecology, Am Handelshafen 12, 27570, Bremerhaven, Germany. Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg, Germany. University of Bremen, FB2, Bremen, Germany
Crustacea Jassa Amphipoda Ischyrocerini revision dispersal CO1

Abstract

The amphipod genus Jassa Leach, 1814 now comprises 24 species that occur in temperate regions of both hemispheres on solid substrates from the lower intertidal zone to 500 m depth. The propensity for some species to form dense colonies in water intake structures and offshore platforms has brought them to attention as an unwanted pest. Based on the examination of ~25,000 specimens from ~1,100 museum and private collections, it is evident that some species of Jassa have been transported by human vectors since at least the 19th century and now occur widely. Their colonial, tube-living habit enables such transport, and collection records document them on ships, buoys and portable water systems as well as on natural movable substrates such as logs, drift algae and larger crustaceans. Because Jassa can be so readily found, but species discrimination has had a problematic history, the purpose of this monograph is to assist researchers to identify species through illustrations, descriptions, keys and habitat summaries. Seven species which were named in the 19th century but whose names have lapsed are placed in the context of currently known species. Two new species, J. laurieae n. sp. and J. kimi n. sp. are described, and J. monodon (Heller, 1866) and J. valida (Dana, 1853) are resurrected. Jassa mendozai Winfield et al., 2021 is submerged under J. valida, and J. cadetta Krapp et al., 2008 and J. trinacriae Krapp et al., 2010 are submerged under J. slatteryi Conlan, 1990. Morphological differences are related to current understanding of growth, behaviour and ecology. CO1 analysis suggests a Southern Hemisphere origin with diversification northward and an evolutionary direction toward greater physiological plasticity, leading to success in long distance transport and establishment in exotic locations. Correct identification of Jassa world-wide will facilitate further research on this ecologically important genus and will allow for differentiation of indigenous from exotic introductions.

 

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