First record of a xiphosuran trackway (Kouphichnium isp.) from the Jurasic of India

A 44 cm long trackway from the Kimmeridgian-Tithonian of the western Kachchh Basin represents the first evidence of the occurrence of members of the order Xiphosura in the Jurassic of India. The track consists of the imprints of the legs and the tail spine of a 36–44 cm long limulid and can be assigned to the ichnogenus Kouphichnium Nopsca, 1923. It was formed in a soft, silty to fine sandy substrate below the storm wave-base and preserved as a hyporelief at the base of a thin sandstone bed deposited by storm-induced currents. Eight different types of xiphosuran behaviour are known to be preserved as trace fossils: “swimming”, running, walking, crawling, mating, dying, ploughing, and resting. The present trackway from the Jurassic of India represents crawling, i.e., comparatively slow locomotion (Repichnia).