A synopsis of Eurycarcinus A. Milne-Edwards, 1867 (Decapoda, Brachyura, Pilumnidae)

in Crustaceana
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The taxonomy of the intertidal pilumnid crab Eurycarcinus A. Milne-Edwards, 1867 is reviewed in the present work. Characters that define Eurycarcinus and distinguish it from the allied genera Heteropanope Stimpson, 1858, Pilumnopeus A. Milne-Edwards, 1867, and Benthopanope Davie, 1989 are discussed. Eurycarcinus can be distinguished from these genera by the smooth features of the carapace, shape and form of the male pleon, and structure of the male thoracic sternum, notably the shapes of sternites 1-4 and whether sternite 8 is exposed when the pleon is closed. Of the four species of Eurycarcinus, E. bengalensis Deb, 1999, is here assigned to Heteropanope. Furthermore, Eurycarcinus species are known for certain only from the western Indian Ocean.

Crustaceana

International Journal of Crustacean Research

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References

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Figures

  • Overall view. A, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; B, E. natalensis, female (20.4 × 13.4 mm) (ZRC 2000.1788), Kenya; C, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; D, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt.

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  • Overall view. A, Heteropanope glabra Stimpson, 1858, male (12.3 × 9.0 mm) (ZRC 2004.497), Sarimbun, Singapore; B, Pilumnopeus serratifrons (Kinahan, 1856), male (19.9 × 14.9 mm) (ZRC 1995.972), New South Wales, Australia; C, Benthopanope eucratoides (Stimpson, 1858), male (12.5 × 9.5 mm) (ZRC 2015.310), Cyrene Reefs, Singapore.

    View in gallery
  • Male anterior thoracic sternum (sternites 1-4) and pleon. A, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; B, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; C, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt; D, Heteropanope glabra Stimpson, 1858, male (12.3 × 9.0 mm) (ZRC 2004.497), Sarimbun, Singapore; E, Pilumnopeus serratifrons (Kinahan, 1856), male (19.9 × 14.9 mm) (ZRC 1995.972), New South Wales, Australia; F, Benthopanope eucratoides (Stimpson, 1858), male (12.5 × 9.5 mm) (ZRC 2015.310), Cyrene Reefs, Singapore.

    View in gallery
  • Male posterior thoracic sternum and pleon. A, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; B, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; C, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt; D, Heteropanope glabra Stimpson, 1858, male (12.3 × 9.0 mm) (ZRC 2004.497), Sarimbun, Singapore; E, Pilumnopeus serratifrons (Kinahan, 1856), male (19.9 × 14.9 mm) (ZRC 1995.972), New South Wales, Australia; F, Benthopanope eucratoides (Stimpson, 1858), male (12.5 × 9.5 mm) (ZRC 2015.310), Cyrene Reefs, Singapore. Abbreviations: cx4, cx5 = coxae of fourth and fifth ambulatory legs, respectively; so1-so5 = pleonal somites 1-5, respectively; st7, st 8 = sternites 7 and 8, respectively.

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  • Male pleon. A, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; B, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; C, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt; D, Heteropanope glabra Stimpson, 1858, male (12.3 × 9.0 mm) (ZRC 2004.497), Sarimbun, Singapore; E, Pilumnopeus serratifrons (Kinahan, 1856), male (19.9 × 14.9 mm) (ZRC 1995.972), New South Wales, Australia; F, Benthopanope eucratoides (Stimpson, 1858), male (12.5 × 9.5 mm) (ZRC 2015.310), Cyrene Reefs, Singapore.

    View in gallery
  • A, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; D, E. natalensis, female (20.4 × 13.4 mm) (ZRC 2000.1788), Kenya; B, E, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; C, F, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt. A-C, dorsal view of carapace; D-F, frontal view of cephalothorax (brushed clean). C with right side completely denuded.

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  • A, D, G, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; B, E, H, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; C, F, I, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt. A-C, left third maxilliped; D-F, chela; G-I, male telson, and pleonal somites 5 and 6.

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  • A, D, E, Eurycarcinus natalensis (Krauss, 1843), male (25.1 × 16.3 mm) (ZRC 2017.1040), Kenya; B, F, G, E. orientalis A. Milne-Edwards, 1867, male (27.9 × 18.0 mm) (ZRC 2014.73), Iraq; C, H, I, E. integrifrons De Man, 1879, male (22.2 × 17.1 mm) (ZRC 2017.198), Egypt. A-C, ventral view of left G1; D, F, H, ventral view of distal part of left G1; E, G, I, dorsal view of distal part of left G.

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