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Kulindroplax
''Kulindroplax perissokomos'' is a Silurian mollusk, known from a single fossil from the Wenlock Series ''Lagerstätte'' fauna of England. It lived during the Homerian Age (about 425 million years ago).〔 It is considered a basal aplacophoran. Unlike all modern aplacophorans, which are shell-less, ''Kulindroplax'' has a chiton-like shell, and it is considered a transitional fossil in the evolution of mollusks.〔(【引用サイトリンク】url=http://news.yale.edu/2012/10/03/ancient-mollusk-tells-contrary-story )〕〔(【引用サイトリンク】url=http://www3.imperial.ac.uk/newsandeventspggrp/imperialcollege/newssummary/news_3-10-2012-18-20-12 )〕
The only known specimen, described in 2012, was conserved at the Oxford University Museum of Natural History.〔
==Morphology==
''Kulindroplax'' is about wide and long.〔 It is the first known mollusk showing an unambiguous combination of valves, or exterior shells, and a worm-like body.〔 It bears seven similar, unarticulated valves, with a shorter head valve and a taller caudal one, lacking ornaments〔 and also several densely packed, long spicules. It has no discernible foot,〔 and the radula is not preserved.〔 A gill array is present, along with a respiratory cavity opening posteriorly. These features make it more reminiscent of caudofoveate aplacophorans.〔
While aculiferan mollusks usually bear eight dorsal valves (except for multiplacophorans and ''Acaenoplax''), ''Kulindroplax'' bears only seven in a single chiton-like row.
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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