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Pterygotus
''Pterygotus'' (meaning ''wing-animal'' or ''finned one'') is a genus of marine arthropod within the extinct order eurypterida (or ''Sea Scorpion''), and includes some of the largest species of this group.
==Description==
Pterygotid eurypterids, which lived from the Early Silurian to Devonian periods, were characterised by small to large exoskeletons with semilunar scales. The telson (tail) was expanded, or flatter than it was tall. Pterygotids also had chelicerae (claws in front of the mouth) that were large and long, with strong, well developed teeth on the claws. Their walking legs were small and slender, without spines.
''Pterygotus'' is distinguishable from other pterygotids by the curved distal margin of the chelae. The prosoma (head) is subtrapezoidal (a trapezoid with rounded corners), with compound eyes located near the edge of the front corners. The telson has a pronounced dorsal carina (or keel) running down its center, terminating in a short spine.〔
''Pterygotus'' could reach a body length of , had a pair of large compound eyes, as well as another pair of smaller eyes in the center of its head. It had 4 pairs of walking legs, a fifth pair modified into swimming paddles, and a pair of large chelae (pincers) for subduing prey. The foremost 6 tergites, or tail sections, contained gills and the reproductive organs of the animal.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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