Many placoderms had one or both, and it is from this circumorbital series that the jugal seems to have derived. |
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Anteriorly, the postorbital contacts the jugal, and posteriorly the postorbital enters the upper temporal arch. |
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For example, in the Podcnemoidae, the jugal makes contact with the parietal, the postorbital being very reduced. |
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A ventral projection of the jugal extends over the lateral surface of the maxilla. |
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The depression is the scar marking the overlap of the jugal process of the zygomatic arch on to the maxilla, as in therian mammals generally. |
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The zygomatic arch looks right, but the anterior portion is mostly maxilla, rather than jugal. |
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The right zygomatic arch was fractured at the junction of the jugal and squamosal bones. |
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In order to make room for the bill, the jugal bar reaches the quadrate from a position more laterally than is usually the case. |
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The postfrontal and jugal form the posterior border of the orbit. |
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Reptilian dermal roofing bones, lying superficial to the muscles of the jaw, are represented in mammals only by the jugal bone of the zygomatic arch, which lies under the eye. |
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