Pyrrhulina beni
Pyrrhulina is closely related to Copeina and Copella, although it is distinguished from the former by having only one row of teeth (in Copeina there are two). When the genus Copella was established, many species were removed from the genus Pyrrhulina and placed there, because differences in the maxillary bones in the males had been detected. Copella species are slimmer and more elongate than those species that remained in the genus Pyrrhulina.
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