Use this URL to cite or link to this record in EThOS:
Title: The ecology, evolution and extinction of Spiriferina in the Lower Jurassic
Author: Thomas, A. R.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1979
Availability of Full Text:
Access from EThOS:
The Lower Jurassic species of Spiriferina d'Orbigny are revised in this thesis. Twenty-six species and one subspecies are described from Europe, North and South America, Africa, Asia and Indonesia, based on morphological, stratigraphical and ecological observations. Detailed examination permits the introduction of new taxa comprising two subgenera, Plicatispiriferina and a nominate subgenus, one species S. thorncombensis and a subspecies S. tumida chilensis, A key is included for easy identification. All species have been traced as far as possible to their original publication and aided by museum, reference and collections made by the writer. The composition and status of the genus, subgenera and species including the origin and history of the type-species are discussed in detail. Serial transverse grinding has been used to study the internal structure of all but the rarest species and depicted as detailed drawings made from acetate peels. The geographical distribution of certain and distinctive species is plotted and discussed. It is suggested that a distinctive province is recognisable in the south-eastern Mediterranean part of Tethys. Their evolutionary relationship to those spiriferinids of the Triassic is discussed and a scheme proposed for the classification of the superfamily Spiriferinacea Davidson. The ecological and stratigraphical distribution is considered at length and in conclusion a number of possible explanations are suggested for their mass extinction in the Upper Liss.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available