6 research outputs found
Recommended from our members
Blurred Boundaries and Novel Normativities: The Jews of Arabia, the Quranic Milieu, and the “Islamic Judaism” of the Middle Ages
This article discusses critical issues surrounding the Jewish-Muslim encounter, framed as an evaluation of the approach and conclusions of two recent publications by Aaron W. Hughes: Shared Identities: Medieval and Modern Imaginings of Judeo-Islam (2017) and Muslim and Jew (2019). Hughes’s works present a critique of the established historiography on Jewish-Muslim relations and exchanges, examining such subjects as the Jews of late antique Arabia, the Jewish matrix of the Quran and formative Islam, and the Judeo-Islamic synthesis of subsequent centuries. I interrogate Hughes’s use of sources, treatment of previous scholarship, and privileging of the specific lens of the “religionist” in approaching the historical evidence. Both of the works under consideration here exhibit numerous problems of conception and argumentation that undermine their value for broadening current horizons of research or refining prevailing pedagogies. Ultimately, although they provoke numerous important questions and deftly expose the conceptual and ideological underpinnings of older scholarship, the books fail to offer a constructive path forward for specialists or stimulate a meaningful paradigm shift in the field
The phylogeny of varanoid lizards and the affinities of snakes
Evidence that platynotan squamates (living varanoid lizards, snakes and their fossil relatives) are monophyletic is presented. Evolutionary relationships within this group are then ascertained through a cladistic analysis of 144 osteological characters. Mosasauroids (aigialosaurs and mosasaurs), a group of large marine lizards, are identified as the nearest relatives of snakes, thus resolving the long-standing problem of snake affinities. The mosasauroid–snake clade (Pythonomorpha) is corroborated by 40 derived characters, including recumbent replacement teeth, thecodonty, four or fewer premaxillary teeth, supratemporal–prootic contact, free mandibular tips, crista circumfenestralis, straight vertical splenio-angular joint, loss of posterior ramus of the coronoid, reduced basipterygoid processes, reduced interpterygoid vacuity, zygosphene–zygantral articulations, and absence of epiphyses on the axial skeleton and skull. After mosasauroids, the next closest relatives of snakes are varanids (Varanus, Saniwa and Saniwides) and lanthanotids (Lanthanotus and Cherminotus). Derived features uniting varanids and lanthanotids include nine cervical vertebrae and three or fewer pairs of sternal ribs. The varanid–lanthanotid–pythonomorph clade, here termed Thecoglossa, is supported by features such as the anteriorly positioned basal tubera, and the loss of the second epibranchial. Successive outgroups to thecoglossans are Telmasaurus, an unresolved polytomy (Estesia, Gobidermatidae and Helodermatidae), Paravaranus and Proplatynota. The 'necrosaurs' are demonstrated to be an artificial (polyphyletic) assemblage of primitive platynotans that are not particularly closely related to each other. Snakes are presumed to have evolved from small, limbless, burrowing lizards and the inability of previous analyses to resolve the affinities of snakes has been attributed to extensive convergence among the numerous lineages of such lizards. The present study contradicts this claim, demonstrating that the problem is due instead to omission of critical fossil taxa. No modern phylogenetic analysis of squamate relationships has simultaneously included both mosasauroids and snakes: previous studies have therefore failed to identify the mosasauroid–snake association and the suite of derived characters supporting it. Mosasauroids are large aquatic animals with well-developed appendages, and none of the derived characters uniting mosasauroids and snakes is obviously correlated with miniaturization, limb reduction or fossoriality. Recognition that mosasauroids, followed by varanids and lanthanotids, are the nearest relatives of snakes will also facilitate studies of relationships within snakes, which until now have been hampered by uncertainty over the most appropriate (closely-related) lizard outgroups