FIGURE 13 in Revalidation of Pyxicephalus angusticeps Parry, 1982 (Anura: Natatanura: Pyxicephalidae), a bullfrog endemic to the lowlands of eastern Africa

FIGURE 13. Spectrograms of Pyxicephalus Tschudi, 1838 produced via a DFT filter of 256 points. 13A. Pyxicephalus adspersus Tschudi, 1838 from Bloemfontein, South Africa (recorded by Louis du Preez). 13B. Pyxicephalus adspersus Tschudi, 1838 from Naboomspruit, South Africa (from collection of Alan Channing), with numerous calls of Kassina senegalensis Duméril & Bibron, 1841 visible above [published in Channing et al. 1994]. 13C. Pyxicephalus edulis Peters, 1854 from 'Transvaal' (from collection of Alan Channing). 13D. Pyxicephalus edulis Peters, 1854 from Tschaneni, Swaziland (recorded by Vincent Carruthers). 13E. Pyxicephalus angusticeps Parry, 1982 New Status from Beira, Mozambique (recorded by Alan Channing) [published in Channing et al. 1994].