Species - Rhithropanopeus harrisii

  • Rhithropanopeus harrisii (Gould, 1841)
  • Harris mud crab
  • Understanding of Rhithropanopeus harrisii was summarised by Brockerhoff and McLay (2011) and Global Invasive Species Database (2020). Recent research on Harris mud crab includes monitoring using citizen science in the Finnish Baltic Sea, an area without native crabs (Lehtiniemi et al., 2020). Because it is an introduced species, research  on the species’ biology  continues attract interest. For example, in the Baltic Sea, its susceptibility to parasitism (Tepolt et al., 2020) and pollutants (Wilman et al., 2019) have been investigated. A valuable compilation of ecological and life-history information is available in Aarnio et al. (2015).

  • Adult crabs would be expected in estuaries and freshwater lakes near the sea preferring a temperature range of 20–25°C. It is typically found sheltering under rocks or vegetation in shallow water.

    The shell (carapace) of the Harris mud crab carapace is about 1.3 times as wide as long, with the sides converging posteriorly. The front, between the eyes, occupies a third of the carapace width. The carapace is greenish-brown to olive green with white underneath and reaches 20 mm wide. The claws have white tips. The distinguishing features are the four lobes on each side separated by triangular clefts, the last two being sharper.

    The species is not so far known from Australia.

  • https://www.marinepests.gov.au/pests/identify/harris-mud-crab
  • Not Established
  • Not recorded
  • Northwest Atlantic

    Rhithropanopeus harrisii is native to fresh to estuarine waters  in the northwest Atlantic (from Gulf of St Lawrence, Canada to Vera Cruz, Mexico) (Williams, 1984; Brockerhoff and McLay, 2011). 

    Alien species in the Adriatic Sea, Aral Sea, Azerbaijan, Azov Sea, Baltic Sea, Belgium, Black Sea, Britain, Bulgaria, Caspian Sea, Denmark, France, Germany, Iran, Italy, Kazakhstan. Lithuania, Mediterranean Sea, Netherlands, North Sea, Panama Canal, Poland, Portugal, Romania, Russia, Spain, Tunisia, Turkmenistan, Ukraine, Uzbekistan, Pacific Coast and Texas lakes of United States (Aladin and Potts, 1992; Roche et al., 2009; Boyle et al., 2010; Jensen, 2010; Brockerhoff and McLay, 2011; Global Invasive Species Database, 2020). It was first reported in the Netherlands before 1874. The most recent range expansion was to Japan (Iseda et al., 2007), into the Panama Canal (Roche et al., 2009) and Moldova (Philipenko, 2018).

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Additional information
  • <p>Photograph of <em>Rhithropanopeus harrisii </em>viewed from above, on black background.</p>

    Photograph of Rhithropanopeus harrisii viewed from above, on black background.

    Copyright Notice: Rhithropanopeus harrisii © Morris et al. 1980. Acknowledge: true
  • <p><em>Rhithropanopeus harrisii</em> more usual colour although colours do vary.</p>

    Rhithropanopeus harrisii more usual colour although colours do vary.

    Copyright Notice: Rhithropanopeus harrisii © Arthur Anker 2007. Acknowledge: true
  • <p>Female<em> R. harrisii </em>carying eggs</p>

    Female R. harrisii carying eggs

    Marine Pest Photo album, ID confirmed by P. Davie, Qld Museum.
  • <p>Size range of <em>R. harrissii </em>from a small collection.</p>

    Size range of R. harrissii from a small collection.

    Marine Pest Photo album, ID confirmed by P. Davie, Qld Museum.
  • <p>Zoea&nbsp;larva of <em>R. harrisii</em>, front on view.</p>

    Zoea larva of R. harrisii, front on view.

    Marine Pest Photo album, ID confirmed by P. Davie, Qld Museum.

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