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v elongate, compressed, ribbon-likeD & A: low, v long basesmouth large, lower jaw protrudes
strong teethpelvics tiny (I, 1) or absentC: very small -
elongate/fusiform, compressed2 Ds, D2 shorter base
sometimes finlets after D & AC forkedlower jaw projects
strong teeth + fangspelvic I, 0-5A I-III