New Report on Two Species of Hippolytid Shrimps (Crustacea: Decapoda: Caridea) Collected at Sea Cucumber Farm, East Sea, Korea

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  • ABSTRACT

    Two species of hippolytid shrimps, Eualus kuratai Miyake and Hayashi, 1967 and Heptacarpus igarashii Hayashi and Chiba, 1989, were collected at a sea cucumber farm from the East Sea. These species are described and illustrated for the first time in Korea. Eualus kuratai is closely related to E. middendorffi; however, it lacks a dorsomedian spine on the fourth and fifth abdominal somites. Heptacarpus igarashii can be easily distinguished from other Korean Heptacarpus species due to its short rostrum that lacks ventral teeth on margin. This report extends the previously known ranges from Japan and Korea. In Korea, both genera, Eualus and Heptacarpus, have seven species according to the present report, respectively; moreover, hippolytid shrimps now consist of 31 species of nine genera.


  • KEYWORD

    Hippolytid , shrimp , Eualus kuratai , Heptacarpus igarashii , Korea

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  • [Fig. 1.] Eualus kuratai, male (CL 8.08 mm). A, Habitus, lateral; B, Carapace, lateral; C, Left antennule, dorsal; D, Right antennal scale, dorsal; E, Left third maxilliped, lateral; E′, Left third maxilliped, distal segment; F, Right 1st pereopod, lateral; G, Left 2nd pereopod, lateral; H, Left 3rd pereopod, lateral; I, Left 4th pereopod, lateral; J, Left 5th pereopod, lateral; K, Telson, dorsal. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace. Scale bars: A, B=2 mm, C-K=1 mm, E′=0.5 mm.
    Eualus kuratai, male (CL 8.08 mm). A, Habitus, lateral; B, Carapace, lateral; C, Left antennule, dorsal; D, Right antennal scale, dorsal; E, Left third maxilliped, lateral; E′, Left third maxilliped, distal segment; F, Right 1st pereopod, lateral; G, Left 2nd pereopod, lateral; H, Left 3rd pereopod, lateral; I, Left 4th pereopod, lateral; J, Left 5th pereopod, lateral; K, Telson, dorsal. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace. Scale bars: A, B=2 mm, C-K=1 mm, E′=0.5 mm.
  • [Fig. 2.] Eualus kuratai, male (CL 8.08 mm). CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace.
    Eualus kuratai, male (CL 8.08 mm). CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace.
  • [Fig. 3.] Heptacarpus igarashii, ovigerous female (CL 6.55 mm). A, Dorsal view; B, Lateral view. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace.
    Heptacarpus igarashii, ovigerous female (CL 6.55 mm). A, Dorsal view; B, Lateral view. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace.
  • [Fig. 4.] Heptacarpus igarashii, ovigerous female (CL 6.55 mm). A, Habitus, lateral; B, Carapace, lateral; C, Left antennule, dorsal; D, Left antennal scale, dorsal; E, Right third maxilliped, lateral; E′, Right third maxilliped, distal segment; F, Right 1st pereopod, lateral; G, Right 2nd pereopod, lateral; H, Right 3rd pereopod, lateral; I, Right 4th pereopod, lateral; J, Right 5th pereopod, lateral; K, Telson, dorsal. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace. Scale bars: A, B=2 mm, C-K=1 mm, E′=0.5 mm.
    Heptacarpus igarashii, ovigerous female (CL 6.55 mm). A, Habitus, lateral; B, Carapace, lateral; C, Left antennule, dorsal; D, Left antennal scale, dorsal; E, Right third maxilliped, lateral; E′, Right third maxilliped, distal segment; F, Right 1st pereopod, lateral; G, Right 2nd pereopod, lateral; H, Right 3rd pereopod, lateral; I, Right 4th pereopod, lateral; J, Right 5th pereopod, lateral; K, Telson, dorsal. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace. Scale bars: A, B=2 mm, C-K=1 mm, E′=0.5 mm.