Early Ordovician (Arenigian)
Upper Fezouata Formation
Zagora, Draa Valley, Morocco

111mm slab with 5 aglaspids, each about 7mm. One is complete and shows some appendages, others are partials

Arthropod. Multiple. Lagerstatten. Soft-bodied. Aglaspidid.

Aglaspids are best-known from the Late Cambrian but they survived into the Early Ordovician, dying out by the end of the period.  It has been proposed that they are related to the ancestors of horseshoe crabs and arachnids.