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. 2009 Apr 17;212(9):1377–1391. doi: 10.1242/jeb.028506

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Fig. 8. — Results from a principal coordinates analysis (PCo2 versus PCo1) of spectrographic cross-correlation (SPCC–PCo) (Cortopassi and Bradbury, 2000) of 166 vocalizations from six species of toadfishes. Sounds analyzed included harmonic hoots from the boatwhistle vocalizations of B. trispinosus (filled blue squares), H. didactylus (filled red circles), O. beta (open green circles), O. phobetron (open purple squares), O. tau (open blue triangles) and the hum of P. notatus (filled orange triangles). Due to their temporal similarity to toadfish boatwhistles, `growls' of P. notatus (filled yellow diamonds) were also analyzed.