Two new species of the genus Actumnus Dana, 1851 (Decapoda, Brachyura, Pilumnidae) from the Ryukyu Islands, southwest Japan

in Crustaceana
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Two new species of the crab genus Actumnus Dana, 1851 (family Pilumnidae) are reported from the Ryukyu Islands, southwest Japan. Actumnus tsurukaii sp. nov. is similar to A. squamosus (De Haan, 1835), A. setifer (De Haan, 1835) and A. forficigerus (Stimpson, 1858) in possessing a poorly defined dorsal surface of the carapace with a coat of short setae, but differs in having relatively larger, fewer and more widely spaced conical granules or tubercles on the outer surfaces of the palms of both chelipeds. Actumnus uformis sp. nov. is similar to A. dorsipes Stimpson, 1858 and A. granotuberosus Garth & Kim, 1983 in having a prominently areolated dorsal surface of the carapace with a soft thick tomentum, but can be distinguished by the stronger areolation and the distinctly U-shaped protogastric region.

Two new species of the genus Actumnus Dana, 1851 (Decapoda, Brachyura, Pilumnidae) from the Ryukyu Islands, southwest Japan

in Crustaceana

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References

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Figures

  • View in gallery

    Actumnus tsurukaii sp. nov., holotype, male (NSMT-Cr 24599; cw 11.5 × cl 8.7 mm). A, dorsal view; B, ventral view.

  • View in gallery

    Actumnus tsurukaii sp. nov., holotype, male (NSMT-Cr 24599; cw 11.5 × cl 8.7 mm). A, frontal view; B, first and second pleopods in ventral view.

  • View in gallery

    Male pleopods of Actumnus tsurukaii sp. nov., holotype, male (NSMT-Cr 24599; cw 11.5 × cl 8.7 mm) (A-C), and A. uformis sp. nov., holotype, male (NSMT-Cr 16198; cw 9.7 × cl 7.2 mm) (D-F). A, D, right first pleopod in mesial view; B, E, distal part of the same; C, F, right second pleopod in mesial view. Scale = 1 mm for A, C, D, F; 0.25 mm for B, E.

  • View in gallery

    Actumnus uformis sp. nov. A, holotype, male (NSMT-Cr 16198; cw 9.7 × cl 7.2 mm) in dorsal view; B, chelae of holotype in outer view; C, paratype, female (URMF-ZC-4325; cw 9.7 × cl 7.2 mm) in dorsal view.

  • View in gallery

    Actumnus uformis sp. nov., holotype, male (NSMT-Cr 16198; cw 9.7 × cl 7.2 mm) (A, B), and paratype female (URMF-ZC-4325; cw 9.7 × cl 7.2 mm) (C, D). A, anterior half of carapace dorsal surface in dorsal view; B, ventral view; C, antero-dorsal view; D, chelae in outer view.

  • View in gallery

    A, B, Actumnus squamosus (De Haan), male (NSMT—Cr 8358; cw 12.8 × cl 10.0 mm) from the Ariake Sea, west of Kyushu; C, D, A. setifer (De Haan), female (URMF-ZC, unregistered; cw 17.3 × cl 12.5 mm) from Nakagusuku Bay, Okinawa-jima I., Ryukyu Is.; E, F, A. dorsipes Stimpson, male (NSMT-Cr 6383; cw 11.7 × cl 8.5 mm) from Kushimoto, Kii Penin.; G, H, A. forficigerus Stimpson, male (NSMT-Cr 13891; cw 12.0 × cl 9.0 mm) from Ariake Sea, west of Kyushu.

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