Chelicerata Heymons, 1901 Xiphosura s. lat. Latreille, 1802 - horseshoe crabs see Class Xiphosura Latreille, 1802 Prosomapoda Lamsdell, 2013 Planaterga Lamsdell, 2013 Family †Bunodidae Packard, 1886 Genus †Pasternakevia Selden & Drygant, 1987