Input (grade 13): Xiphosura is an order of marine chelicerates which includes a large number of extinct lineages and only four recent species in the family Limulidae, which include the horseshoe crabs.
Output (grade 9): Xiphosura is an order of marine chelicerates. It includes a large number of extinct lines and only four recent species in the family Limulidae, which include the horseshoe crabs.