What is "peltidium"

n. (context anatomy English) A prodorsal shield in chelicerates

Peltidium is a prodorsal shield found in animals of the Subphylum Chelicerata, in the Phylum Arthropoda. In some groups ( Schizomida, Palpigradi, Solpugida and Opiliones) the peltidium, also known as schizopeltid, can be subdivided in: propeltidium, a carapace-like shield that covers the proterosoma, which comprises the fused acron (protocerebral region) and first four segments; and two free segments, mesopeltidium and metapeltidium (Online Dictionary of Invertebrate Zoology).