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The family Hexatrygonidae consists of one genus containing only one species. These marine stingrays are unique in that they have six pairs of gill openings and six gill arches, rather than five. They also have a distinctive triangular long snout, confluent with the rest of the disc created by the pectoral fins. They have a functional sting, but no reports of negative effects on humans were found. Little information was found regarding Hexatrygonidae, but stingrays in general are viviparous (see Development and Reproduction), and carnivorous.


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Source: Animal Diversity Web

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