ROLFOSTEUS
Rolfosteus canningensis is Associate in Nursing extinct arthrodire aquatic vertebrate from the Late geological period of the Gogo Formation of Australian state.
The fifteen centimetres (5.9 in) long creature had robust plating on the front of its body. Like alternative arthrodires like Coccosteus and also the large Dunkleosteus it had sharp, bony plates in its mouth that fashioned a turtle-like beak for cutting prey to items. Rolfosteus's most uncommon feature was its extremely elongated snout, which can are accustomed enhance its sense of smell, moreover as increase its fluid mechanics streamlining.
COCCOSTEUS
Coccosteus ("Seed Bone") is associate degree extinct genus of arthrodire aquatic vertebrate. Its fossils are found throughout Europe and North America. the bulk of those are found in fresh sediments, though, such an outsized vary suggests that they'll are able to enter water. the most important specimens were regarding forty centimetres (16 in), though the common length was twenty to twenty four centimetres (7.9 to 9.4 in)
DUNKIEOSTEUS
Dunkleosteus is associate extinct genus of arthrodire aquatic vertebrate fish that existed throughout the Late Devonian period, regarding 358–382 million years past. The name Dunkleosteus combines the Greek osteus (οστεος), that means "bone", and Dunkle, in honor of David Dunkle of the Cleveland depository of explanation. It consists of 10 species: D. terrelli, D. belgicus, D. denisoni, D. marsaisi, D. magnificus, D. missouriensis, D. newberryi, D. amblyodoratus, and D. raveri; a number of that ar among the biggest placoderms to own ever lived. the biggest species, D. terrelli, grew up to six m (20 ft) long and one t (1.1 short tons) in weight. Few different placoderms rivaled Dunkleosteus in size. Dunkleosteus may quickly open and shut its jaw, like modern-day suction feeders, and had a bite force of 6,000 to 7,000 N (1,350 to 1,570 lbf).