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Laccognathus
''Laccognathus'' is an extinct genus of amphibious lobe-finned fish from Europe and North America. They existed from the Middle Devonian to the Late Devonian (around 397.5 to 360 mya). The name comes from Greek for 'pitted jaw'.〔
==Description==
Species of ''Laccognathus'' were characterized by the presence of three large pits (fossae) on the external surface of the lower jaw which may have had sensory functions. It is the origin of the genus name, from Greek λάκκος ('pit') and γνάθος ('jaw'). ''Laccognathus'' grew to approximately in length. They had very short dorsoventrally flattened heads, less than one-fifth the length of the body. Like other sarcopterygians, their fins arise from pairs of fleshy lobes.〔
The skeleton of ''Laccognathus'' was structured such that large areas of the skin were stretched out over solid plates of bone. This bone was composed of particularly dense fibers—so dense that cutaneous respiration (exchange of oxygen through the skin) was not a likely trait exhibited by ''Laccognathus''. Rather, the dense ossifications served to retain water inside the body as ''Laccognathus'' traveled on land between bodies of water.
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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