Sundathelphusa miguelito, a new species of freshwater crab from the southern Philippines (Brachyura, Gecarcinucidae)

in Crustaceana
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A new species of the freshwater crab genus Sundathelphusa Bott, 1969 (Gecarcinucidae) is described from the island of Mindanao in the southern Philippines. The Philippine Islands host the greatest species diversity of this genus, although only four species were previously known from Mindanao. The new species is most similar to S. mistio (Rathbun, 1904) and S. montanoanus (Rathbun, 1904) in the general carapace outline and leg proportions, but it can be distinguished by features of the carapace, thoracic sternum and gonopods. With this discovery, there are now 29 species of Sundathelphusa known from the Philippines.

Sundathelphusa miguelito, a new species of freshwater crab from the southern Philippines (Brachyura, Gecarcinucidae)

in Crustaceana

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References

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BottR.1969. Flußkrabben aus Asien und ihre Klassifikation (Crustacea, Decapoda). Senckenbergiana Biologica50: 359-366.

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Figures

  • View in gallery

    Sundathelphusa miguelito sp. nov., holotype, male, 26.1 × 20.5 mm (NMCR-39999). A, dorsal habitus; B, cephalothorax, ventral view; C, cephalothorax, anterior view; D, right (minor) chela, external view; E, left (major) chela, external view. Scale bars: A = 10.0 mm; B-E = 5.0 mm.

  • View in gallery

    Sundathelphusa miguelito sp. nov., paratype, female, 31.4 × 25.1 mm (ZRC 2016.0666). A, dorsal habitus; B, cephalothorax, anterior view; C, cephalothorax, ventral view. Scale bars: A = 10.0 mm; B, C = 5.0 mm.

  • View in gallery

    Sundathelphusa miguelito sp. nov., holotype, male, 26.1 × 20.5 mm (NMCR-39999) (A-I); paratype, female, 31.4 × 25.1 mm (ZRC 2016.0666) (J, K). A, carapace, dorsal view; B, right third maxilliped, external view; C, J, frontal triangle, anterior view; D, K, epistome, anterior view; E, anterior thoracic sternum, ventral view; F, carpus of left cheliped (P1), dorsal view; G, pleon (unfolded), external view; H, right P4, dorsal view; I, right P5, dorsal view. Scale bars: A-K = 2.0 mm.

  • View in gallery

    Sundathelphusa miguelito sp. nov., holotype, male, 26.1 × 20.5 mm (NMCR-39999). Left G1: A, external view; B, internal view; D, apex (setae not included), external view; E, apex (setae not included), internal view. Left G2: C, external view. Scale bars: A-C = 1.0 mm; D, E = 0.5 mm.

  • View in gallery

    Sundathelphusa mistio (Rathbun, 1904), holotype, male, 31.8 × 25.8 mm (MNHN-IU-2014-11829). A, carapace, dorsal view; B, cephalothorax, ventral view; C, cephalothorax, anterior view; D, pleon (unfolded), external view [adapted from Rathbun, 1904]; E, left (major) chela, external view; F, left G1, external view; G, left G1, internal view; H, left G2 external view. Scale bars: A-E = 5 mm; F-H = 1 mm.

  • View in gallery

    Sundathelphusa montanoanus (Rathbun, 1904), lectotype, male, 38.8 × 29.9 mm (MNHN-IU-2014-11830) (A, B, F-H); paralectotype, male, 35.9 × 27.8 mm (USNM 29996) (C-E). A, dorsal habitus; B, cephalothorax, ventral view; C, cephalothorax, anterior view; D, right (major) chela, external view; E, left (minor) chela, external view; F, left G1, external view; G, left G1, internal view; H, left G2, external view. Scale bars: A = 10.0 mm; B-E = 5.0 mm; F-H = 1.0 mm.

  • View in gallery

    Sundathelphusa montanoanus (Rathbun, 1904), paralectotype females (USNM 29996), 36.8 × 28.9 mm (A-C), 35.1 × 27.3 mm (D). A, dorsal habitus; B, cephalothorax, anterior view; C, D, pleon, ventral view. Scale bars: A = 10.0 mm; B-D = 5.0 mm.

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