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In page Lamontichthys:

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Sexual dimorphism in Lamontichthys includes hypertrophied odontodes on the pectoral spines in mature males.[1] In all species of Lamontichthys, there is one pectoral fin spine and seven pectoral fin rays on each fin, as opposed to the rest of Loricariinae species which have one pectoral fin spine and only six pectoral fin rays.[1]