Research ArticleEVOLUTIONARY BIOLOGY

Comparative cranial morphology in living and extinct platypuses: Feeding behavior, electroreception, and loss of teeth

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Science Advances  12 Oct 2016:
Vol. 2, no. 10, e1601329
DOI: 10.1126/sciadv.1601329
  • Fig. 1 Photographs showing measurements on the skulls of Ornithorhynchus in left lateral (A, left side) and dorsal (B) views, and Obdurodon in right lateral view (A, right side).

    GLS, greatest length of the skull; OC, occipital condyle; BC, braincase; ZB, zygomatic breadth.

  • Fig. 2 Bivariate plots of skull measurements.

    Regression lines and 95% prediction intervals of the measurements and angles plotted by GLS and geometric mean in the Ornithorhynchus compared to Obdurodon. Scales are log-transformed for linear measurements. Mainland platypuses are shown as gray circles, whereas Tasmanian platypuses are shown as black open circles.

  • Fig. 3 CT slices along the anteroposterior axis of Obdurodon and Ornithorhynchus skulls at the tooth or horny pad position (see Fig. 1).

    (A and B) Ob. dicksoni (from Digimorph; Queensland Museum F20568). (C) Or. anatinus (YAMA M-1). (D) Or. anatinus (from Digimorph; American Museum of Natural History M200255).

  • Table 1 Skull measurements of Obdurodon and Ornithorhynchus.

    Data are means ± SD. n, number of specimens.

    MeasurementsObdurodonOrnithorhynchusn
    GLS131.2092.80 ± 8.3132
    Angle (a)87.0669.15 ± 3.4325
    Angle (b)80.5993.33 ± 3.5525
    Infraorbital foramen3.473.13 ± 0.3832
    Braincase35.8632.18 ± 2.1932
    Zygomatic breadth50.6342.20 ± 3.9832
    Occipital breadth27.4523.76 ± 2.3632
    Orbit11.859.17 ± 0.8432
    Geometric mean25.4121.02 ± 1.8732

Supplementary Materials

  • Supplementary Materials

    This PDF file includes:

    • fig. S1. Relationship between body mass and orbit size (anteroposterior diameter) for Ornithorhynchus and Obdurodon.
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