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<br /> <br />Fig. 11. Postcleithra of late metalarvae and early <br />juveniles. Top - Xyrauchen texanus and subgenus <br />Catostomus; postcleithrum base often extends from <br />cleithrum at much less than 900 angle. Bottom- <br />subgenus Pantosteus; often extends from cleithrum <br />at about 900 angle. <br /> <br />36 <br />