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...
- and Gr****: ἀσπίς aspís 'shield') is an extinct genus of pteraspidid heterostracan jawless fish. It lived from the Lochkovian to Eifelian epochs of the...
- 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...
- Pteraspidiformes is an extinct order of heterostracan agnathan vertebrates known from extensive fossil remains primarily from Early Devonian strata of...
- Rhinopteraspis is an extinct genus of pteraspidid heterostracan agnathan. "Rhinopteraspis cornubica (McCoy), with notes on the classification and evolution...
- Psammosteidae is an extinct family of flattened, benthic heterostracan vertebrates that lived in marine and estuary environments in Europe, Russia & North...
- Ariaspidae is a family of extinct cyathaspidiform heterostracan agnathans in the suborder Cyathaspidida. Family Ariaspidae contains Ariaspis, and its...
- Cyathaspidiformes is an extinct order of heterostracan vertebrates known from extensive fossil remains primarily from Silurian to Early Devonian strata...
- Lepidaspis serrata ("serrated scaly shield") is an extinct heterostracan jawless fish from Early Devonian Canada. Its scientific name refers to the fact...
- drepánē 'sickle' and Gr****: ἀσπίς aspís 'shield') is an extinct genus of heterostracan armoured jawless fish from the Early Devonian (approximately 416 - 397...