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Examples
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It can be distinguished from congeners in having a combination of: postanal length 36·6-44·8 % standard length; pectoral-fin length 14·4-25·9% head length; 34-38 dorsal spines; 42-46 caudal vertebrae; 78-83 total vertebrae; brown background colour without or with only a limited and scattered dark brown reticulate pattern.
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It can be distinguished from congeners in having a combination of: postanal length 36·6-44·8 % standard length; pectoral-fin length 14·4-25·9% head length; 34-38 dorsal spines; 42-46 caudal vertebrae; 78-83 total vertebrae; brown background colour without or with only a limited and scattered dark brown reticulate pattern.
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Nandus mercatus is distinguished from other members of the genus in having a combination of: body depth 43. 0-43.2\% standard length, 15 pectoral-fin rays, 29-32 lateral line scales, 11-12 scale rows below the lateral line, and a slightly concave predorsal profile.
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