Though the subject is reminiscent of Pietro Tacca's four Moors in the Monument to Ferdinando I, Livorno, Italy, these curious bronzes bear closer resemblance to the work of his son, Ferdinando, in the stippling of the tail and hair, undulating surface detail, and facial types. Compare a Doorknocker in the form of an infant mermaid, thought to originate from the workshop of Pietro or Ferdinando Tacca, in the Wallace Collection, London, inv. no. S101.
J. Warren, The Wallace Collection: Catalogue of Italian Sculpture, vol. 2, London 2016, pp. 566-569, no. 120