Drepanaspis

Drepanaspis (from Greek: δρεπάνη drepánē 'sickle' and Greek: ἀσπίς aspís 'shield') is an extinct genus of primitive jawless Ostracoderms from the Early Devonian (approximately 416 - 397 mya) that belonged to the phylum Chordata, infraphylum Agnatha, class Pteraspidomorphi, and the subclass Heterostraci. Drepanaspis are assumed to have lived primarily in marine environments and is most commonly characterized by their ray-like, heavily armored bodies, along with their lack of paired fins and jaws.