Dartmuthia
In Depth So far only known from the head shield, Dartmuthia was a bottom feeding jawless fish of the Silurian period. Further Reading - The ostracoderm genus Dartmuthia patten, George M. Robertson - 1935.
Species Classification: Osteostraci
Cephalaspis
In Depth Cephalaspis is a good example of the jawless fish that swam through the waters of the Devonian. Although jawless, it still had a mouth that was situated to the underside of the head, suggesting that it was a bottom feeder. Also there seems to be sensory organs on the underside of the head … Read more
Tremataspis
In Depth Tremataspis was a jawless fish known to have lived in the European ocean waters of Silurian period. The genus is noted for having a more rounded bony head shield than that seen in other genera, which may have helped Tremataspis to push through softer bottom sediment on the ocean floor. Further Reading - … Read more
Hemicyclaspis
In Depth When compared to other atelaspidiformes, Hemicyclaspis is considered to have been a better swimmer thanks to the presence of a more developed tail and two forward flaps that acted like pectoral fins, controlling pitch and allowing for level swimming in open water. Despite thee swimming adaptations, the mouth was still on the bottom … Read more