Monday, September 27, 2010
Plakorderma merupakan kumpulan pertama vertebrarta-vertebrarta , dan menguasai ekosistem akuatik antara 430 dan 360 juta tahun lepas.
Ikan purba ini dilindungi dengan sebuah perisai comel yang mengawal mereka (plakorderma = "berbaju besi kulit"). Plakorderma terbesar pernah ditemui ialah Dunkleosteus terrelli, yang berukuran 33 kaki panjang (10m) dan beratnya mencecah 4 tan pastinya satu pemangsa utama hebat pada lautan purba.
"Placoderm fishes were the first group of jawed vertebrates, and dominated aquatic ecosystems between 430 and 360 million years ago. These early fishes were covered in a bonny armor that protected them (placoderm = "armored skin"). The biggest placoderm ever found is Dunkleosteus terrelli, which, with its 33 feet (10 m) length and 4 tons must have been a terrific top predator on the ancient oceans."
