An abnormal pygidium of the trilobite Brachymetopus ornatus Woodward from the Lower Carboniferous of Derbyshire
✍ Scribed by A. W. Owen; J. W. Tilsley
- Book ID
- 101281676
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 292 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0072-1050
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✦ Synopsis
A pygidium of Brackyrneropus orncirus Woodward shows an abnormally developed left side affecting the whole of the pleural area and its rib development. Such an extensive abnormality, which does not extend beyond the axial furrow and shows none of the signs of resulting from injury, is currently uniquc. It is interpreted as a teratological condition in which a genetic or developmental malfunction resulted in the partial mimicking of thoracic pleurae rather than the construction of the normal pygidial pleural ribs. The effects of this are progressively greater from the posterior to the anterior parts of the affected plcural region. C' 1996 by John Wiley & Sons, Ltd.