Subclassis Gigantostraca (Подкласс Гигантостраки) = Eurypteroidea (Эвриптероидеи = Эвриптериды = Ракоскорпионы = Морские скорпионы) - Sea scorpions, Eurypterids (En) † - 00125

Genus Eurypterus †,  Species Eurypterus remipes †

Genus Mixopterus Kiæri, 1909 †

Species Mixopterus kiari †

This specimen, is around 400 million years old and comes from the Silurian rocks of Ringerike north of Oslo. It was found by Professor Johan Kiær in 1909. 
The rectangular head shows a variety of appendages modified for grasping, mating, walking and swimming. The long pointed tail of Mixopterus might have been curled over the back of the animal and used for piercing prey, such as fish, held between the grasping appendages. The eurypterids lived from the Ordovician to the Permian and include some of the largest known arthropods up to 2m in length.
Photo: P. Aas  http://www.nhm.uio.no/palmus/galleri/montre/english/m_mixopterus_e.htm   http://www.nhm.uio.no/english/visiting-nhm/geological-museum/fossils/

Genus Pterygotus (Род Птериготус) †

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Начато: 01.2010   Обновлено: 01.2010