D006737Level 6

Horseshoe Crabs

**Definition:** An arthropod subclass (Xiphosura) comprising the North American (Limulus) and Asiatic (Tachypleus) genera of horseshoe crabs.

**Tree numbers:** - B01.050.500.131.450

**Synonyms:** - Crabs, Horseshoe - Xiphosura

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