First record of two species of hermit crabs (Decapoda, Paguridae) from South Korea, with remarks on the associated hydrozoan, Hydrissa sodalis

in Crustaceana
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Two pagurid species, Pagurus quinquelineatus Komai, 2003 and Pagurus rectidactylus Komai, Saito & Myorin, 2015, are reported from South Korea. Pagurus nigrivittatus is most similar to these two species among the congeneric species known from South Korea. The additional morphological differences between P. quinquelineatus and P. rectidactylus are provided briefly. The most distinct feature of the South Korean P. rectidactylus compared to the original description is that an associated hydrozoan, Hydrissa sodalis (Stimpson, 1858) instead of Bouillonactinia misakiensis (Iwasa, 1934) is responsible for the carcinoecia. The association of H. sodalis with other hermit crabs in South Korea was investigated.

First record of two species of hermit crabs (Decapoda, Paguridae) from South Korea, with remarks on the associated hydrozoan, Hydrissa sodalis

in Crustaceana

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References

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Figures

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    Pagurus quinquelineatus Komai, 2003 (female, sl 2.7 mm, NIBRIV0000325763, left second ambulatory leg missing, chelipeds and right ambulatory legs broken). A, dorsal view; B, ventral view.

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    Pagurus rectidactylus Komai, Saito & Myorin, 2015 (male, sl 5.4 mm, MADBK 160748_001). A, shield and cephalic appendages, dorsal view; B, right cheliped, dorsal view; C, left cheliped, dorsal view; D, left pereopod 2, lateral view; E, left pereopod 3, lateral view; F, dactylus of left pereopod 3, mesial view; G, telson, dorsal view. Scale bars = 2 mm.

  • View in gallery

    Pagurus rectidactylus Komai, Saito & Myorin, 2015 (male, sl 5.4 mm, MADBK 160748_001, right cheliped broken). A, dorsal view; B, ventral view.

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    Hydrissa sodalis (Stimpson, 1858) associated with Paguroidea species. A, Pagurus rectidactylus Komai, Saito & Myorin, 2015 (male, sl 5.4 mm, MADBK 160748_001); B, Dardanus impressus (De Haan, 1849) (male, sl 13.7 mm, EVOSYS 260504#004); C, Pagurus simulans Komai, 2000 (male, sl 5.9 mm, MADBK 160719_017).

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    Hydrissa sodalis (Stimpson, 1858) associated with Paguroidea species. A, Dardanus arrosor (Herbst, 1796) (female, sl 8.9 mm, EVOSYS 260502#011); B, Pagurus brachiomastus (Thallwitz, 1892) (male, sl 8.5 mm, EVOSYS 260706#069); C, Diogenes penicillatus Stimpson, 1858 (male, sl 4.1 mm, MADBK 160508_002); D, Elassochirus cavimanus (Miers, 1879) (male, sl 9.0 mm, MADBK 160701_007); E, Pagurus parvispina Komai, 1997 (male, sl 12.7 mm, MADBK 160744_001); F, Pagurus trigonocheirus (Stimpson, 1858) (male, sl 13.1 mm, MADBK 160720_007).

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