Unusually Boulenger actually explains, and I quote, "The name proposed (Tropheus, one who rears, brings up, educates) refers to the peculiar mode of nursing the eggs described hereafter." You see, one of the type specimens of T. moorii was a female brooding 4 large eggs and this was new to Boulenger, he was familiar only with male mouthbrooding in Tilapia. He talks about it at length. He had no way of knowing that so many other taxa he described were also maternal mouthbrooders. We take it for granted!
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