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Coccosteus cuspidatus
Coccosteus #1
Coccosteus is an extinct genus of Placoderms (class Placodermi) lived in the Middle Devonian 3), 4). Bothriolepis and Dunkleosteus are also Placoderms, especially the later and Coccosteus are classified to the same order Arthrodira (meaning "jointed neck"), suborder Brachythoraci (meaning "short thorax") 4).
Coccosteus #2
The type species Coccosteus cuspidatus is about 20 cm in length, that is, not a large fish 3).
Coccosteus #3
Although Coccosteus represented the early Brachythoraci 4), it could open its mouth wide and was presumably able to suck large amount of water at once, including small animals and sedimentary mud 3). But, it had no large fearsome "front tooth" like that of Dunkelosteus (or Dinichthys) 2). (The "tooth" of Placoderms is not a true tooth, but a part of bone. 4))
Coccosteus #4
Specimens of Coccosteus have been found in the sedimentary layers formed in the non-marine environments such as lakes or rivers (e.g.the Scottish Middle Devonian Old Red Sandstone) 1), 4), suggesting Coccosteus lived in the freshwater environments 3).
created in December 2016.
modified in Spetember 2022.