Family RhinatrematidaeCretaceous (145.5β65.5 million years ago) to present; tail present; mouth terminal; premaxillae not fused with nasals; prefrontals absent; squamosal not articulating with frontal; aquatic larvae; 2 genera, 11 species; adult size 25β32 cm (10β13 inches); South America.Family ScolecomorphidaeJurassic (200β145.5 million years ago)β¦
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