Polymorphism in the chelae of mature males of the land crabs Johngarthia lagostoma and Epigrapsus spp.

in Crustaceana
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The growth of the chelae of mature males was examined in three gecarcinid land crabs — Johngarthia lagostoma on Ascension Island, Epigrapsus notatus on Taiwan, and E. politus on Moorea. Chelar dimorphism was found in each species, with a mixture of homochelous and heterochelous males. In J. lagostoma there was progressive polymorphism, with the heterochelous condition appearing only in a proportion of the larger mature males. The situation in Epigrapsus was less clear. The proportion of heterochelous males increased in the larger mature size classes, but progressive polymorphism is yet to be confirmed.

Polymorphism in the chelae of mature males of the land crabs Johngarthia lagostoma and Epigrapsus spp.

in Crustaceana

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References

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Figures

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    Johngarthia lagostoma (H. Milne Edwards, 1837), Ascension Island. A, B, chelae of heterochelous (Type B) male, CW 110 mm, ChLHR 1.33; C, D, chelae of homochelous (Type A) male, CW 109 mm, ChLHR 1.02.

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    Johngarthia lagostoma (H. Milne Edwards, 1837), Ascension Island. log10(chela propodus length) plotted against log10(carapace width). A, Type B males, major chelae (squares); B, Type B males, minor chelae (triangles); C, Type A males, common regression for major and minor chelae; D, Females, common regression for major and minor chelae. For clarity data points omitted for Type A males and females.

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    Epigrapsus notatus (Heller, 1865), Taiwan. A, Homochelous (Type A) male, CW 30.6 mm, ChHHR 1.01; B, Heterochelous (Type B) male, CW 27.5 mm, ChHHR 1.40.

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    Epigrapsus notatus (Heller, 1865), Taiwan. Log10 chela propodus height plotted against log10(carapace width). A, Type B males, major chelae (squares); B, Type B males, minor chelae (triangles); C, Type A males, common regression for major and minor chelae; D, Females, common regression for major and minor chelae. For clarity data points omitted for Type A males and females.

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    Epigrapsus politus Heller, 1862. A, chelae of heterochelous (Type B) male, Ponape [Pohnpei], Caroline Islands, SMF #4290, CW 17.8 mm, ChHHR 2.2; B, chelae of homochelous (Type A) male, Sumatra, SMF No. 5868, CW 21.6 mm, ChHHR 1.03.

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