Selenichnites

Selenichnites (‘moon track’^[3]) is a Cambrian to Jurassic trace fossil that has been found on every continent.^[1] It consists of crescent-shaped impressions interpreted as resting^[3] or burrowing^[1] traces of Xiphosura (extinct relatives of horseshoe crabs).

Selenichnites Temporal range: Cambrian–Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Trace fossil classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Order:	Xiphosura
Ichnogenus:	Selenichnites Romano and Whyte, 1987
Type ichnospecies
†S. hundalensis Romano and Whyte, 1987
Ichnospecies[1]
†S. bradfordensis Chisholm, 1985 †S. cordoformis Fischer, 1978 †S. hundalensis Romano and Whyte, 1987 †S. rossendalensis Hardy, 1970 †S. scagliai Poiré and Del Valle, 1996
Synonyms
Selenichus Romano and Whyte, 1987[2]

The ichnogenus was originally named Selenichnus in 1987 by M. Romano and M. Whyte, but these investigators renamed it as Selenichnites in 1990 after it was pointed out that the name Selenichnus was already in use for a genus of reptile trace fossils.^[4]