Definition of Heterostracan. Meaning of Heterostracan. Synonyms of Heterostracan

- Devonian. The Heterostracans differed from other Paleozoic agnathan taxa both in the arrangement and histology of their scales. Most heterostracans had two...
- Rhinopteraspis is an extinct genus of pteraspidid heterostracan agnathan. "Rhinopteraspis cornubica (McCoy), with notes on the classification and evolution...
- Lepidaspis serrata ("serrated scaley shield") is an extinct heterostracan jawless fish from Early Devonian Canada. Its scientific name refers to the fact...
- and Gr****: ἀσπίς aspís 'shield') is an extinct genus of pteraspidid heterostracan agnathan vertebrate that lived from the Lochkovian to Eifelian epochs...
- Poraspis is an extinct genus of heterostracan. Fossils are found in Late Silurian and Early Devonian marine strata of Norway, Canada and the United States...
- by a small fin web. This tail structure clearly differs from that of heterostracans, which are currently grouped with arandaspids and astraspids in the...
- Palanasaspis chekhivensis is an extinct species of pteraspidid heterostracan agnathan which existed during the Pragian epoch of the early Devonian period...
- Cyathaspis is the type genus of the heterostracan order Cyathaspidiformes. Fossils are found in late Silurian strata in the Cunningham Cr**** Formation...
- Pteraspidiformes is an extinct order of heterostracan agnathan vertebrates known from extensive fossil remains primarily from Early Devonian strata of...
- Panamintaspis snowi is an extinct species of pteraspidid heterostracan agnathan which existed during the early Middle Devonian period of Death Valley...