First Record of Tri-spine Horseshoe Crab, Tachypleus tridentatus (Merostomata: Xiphosurida: Limulidae) from Korean Waters

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  • ABSTRACT

    A tri-spine horseshoe crab, Tachypleus tridentatus (Leach, 1819) was collected from a sandy beach of Udo Island of Jeju during the full moon tides in November 1997. Three spines on the posterior margin of the opisthosoma were characterized indicating that the specimen was T. tridentatus. This specimen was a female with the total length of 49.5 cm and prosoma width of 23.0 cm. Tachypleus tridentatus was the first record from Korean waters. A brief description and figures of the species were given. This finding indicates that Korea is included to the distribution range of the species.


  • KEYWORD

    tri-spine horseshoe crab , Tachypleus tridentatus , Limulidae , Udo Island , Jeju , Korea

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  • [Fig. 1.] Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm). A, Dorsal view; B, Lateral view; C, Ventral view. Scale bars: A-C=10 cm.
    Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm). A, Dorsal view; B, Lateral view; C, Ventral view. Scale bars: A-C=10 cm.
  • [Fig. 2.] A, Lateral view of prosoma of Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm); B, Collecting site of T. tridentatus in Udo Island.
    A, Lateral view of prosoma of Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm); B, Collecting site of T. tridentatus in Udo Island.
  • [Fig. 3.] Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm). A, Ventral view of prosoma; B, Ventral view of chelicerae; C, Ventral view of pedipalp (right).
    Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm). A, Ventral view of prosoma; B, Ventral view of chelicerae; C, Ventral view of pedipalp (right).
  • [Fig. 4.] Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm). A, Ventral view of last walking leg (right); B, Ventral view of spines on lateral margin of opisthosoma (right); C, Ventral view of opisthosoma.
    Tachypleus tridentatus (Leach, 1819), female (total length 49.5 cm). A, Ventral view of last walking leg (right); B, Ventral view of spines on lateral margin of opisthosoma (right); C, Ventral view of opisthosoma.