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Lampreys, together with hagfishes, are the only extant representatives of jawless vertebrates and thus of prime interest for the study of vertebrate evolution . Most lamprey genera occur in two forms with divergent life histories: a parasitic, anadromous and a non-parasitic, freshwater resident form [2-8]. The taxonomic status of such 'paired species' is… (More)
The study of postnatal ontogeny can provide insights into evolution by offering an understanding of how growth trajectories have evolved resulting in adult morphological disparity. The Ursus lineage is a good subject for studying cranial and mandibular shape and size variation in relation to postnatal ontogeny and phylogeny because it is at the same time… (More)
Recent applications of combined EXAFS/powder neutron and X-diffraction analysis are reviewed and provisional results for three additional compounds are presented. Criteria for successful refinements are suggested. The new results relate to the materials: CoAl2O4, La(6.4)Ca(1.6)Cu6Ni2O20 and Pr(0.5)Sr(0.5)FeO(2.75).
Transitions between the marine and freshwater macrohabitat have occurred repeatedly in the evolution of teleost fishes. For example, ariid catfishes have moved from freshwater to marine environments, and vice versa. Opercles, a skeletal feature that has been shown to change during such transitions, were subjected to 2D geometric morphometric analyses in… (More)