Tooth replacement in early sarcopterygians

  title={Tooth replacement in early sarcopterygians},
  author={Mark Doeland and Aidan M. C. Couzens and P. Donoghue and Martin R{\"u}cklin},
  journal={Royal Society Open Science},
Teeth were an important innovation in vertebrate evolution but basic aspects of early dental evolution remain poorly understood. Teeth differ from other odontode organs, like scales, in their organized, sequential pattern of replacement. However, tooth replacement patterns also vary between the major groups of jawed vertebrates. Although tooth replacement in stem-osteichthyans and extant species has been intensively studied it has been difficult to resolve scenarios for the evolution of… Expand
4 Citations
Diverse stem-chondrichthyan oral structures and evidence for an independently acquired acanthodid dentition
The teeth of sharks famously form a series of parallel, continuously replacing files borne directly on the jaw cartilages, in contrast to the site-specific, dermal plate-borne dentition of bonyExpand
More Bone with Less Minerals? The Effects of Dietary Phosphorus on the Post-Cranial Skeleton in Zebrafish
This new zebrafish model is a useful tool to understand the mechanisms underlying osteomalacia and abnormal mineralisation, due to underlying variations in dietary P levels, and indicates that bone formation and mineralisation are uncoupled. Expand
Dental diversity in early chondrichthyans and the multiple origins of shedding teeth
Abstract The teeth of sharks famously form a series of parallel, continuously replacing files borne directly on the mandibular cartilages. In contrast, bony fishes possess site-specific sheddingExpand


Position of Developing Replacement Teeth in Teleosts
A systematic documentation of the position of developing replacement teeth in teleost fishes is presented, based upon a literature review and examination of modern skeletal material, which indicates that extraosseous development of replacement teeth is plesiomorphic. Expand
The stem osteichthyan Andreolepis and the origin of tooth replacement
A three-dimensional virtual dissection of the dentition of a 424-million-year-old stem osteichthyan, Andreolepis hedei, is reported, using propagation phase-contrast synchrotron microtomography, with a reconstruction of its growth history. Expand
Scales and Tooth Whorls of Ancient Fishes Challenge Distinction between External and Oral ‘Teeth’
The new findings reveal, for the first time, how polyodontode scales grow in 3D in an extinct bony fish and show that dentition-like odontode patterning occurs on scales and that the primary patterning unit of a tooth whorl may be the bony base rather than the odontodes it carries. Expand
Development of teeth and jaws in the earliest jawed vertebrates
Evidence is used to indicate that Compagopiscis and other arthrodires possessed teeth, but that tooth and jaw development was not developmentally or structurally integrated in placoderms, reflecting the distinct evolutionary origins of teeth and of component elements of the jaws. Expand
Testing models of dental development in the earliest bony vertebrates, Andreolepis and Lophosteus
These fossil remains have no bearing on the nature of the dentition in osteichthyans and, indeed, the results raise questions concerning the homologies of these bones and the phylogenetic classification of Andreolepis and Lophosteus. Expand
Teeth before jaws? Comparative analysis of the structure and development of the external and internal scales in the extinct jawless vertebrate Loganellia scotica
A test of the phylogenetic distribution of oral and pharyngeal scales and teeth in vertebrates indicates that odontodes are first expressed in an external position, suggesting that internal odontode evolved through the expansion of odontogenic competence from external to internal epithelia. Expand
Evolution of patterns and processes in teeth and tooth-related tissues in non-mammalian vertebrates.
The evolutionary links that exist between odontodes and organs that are phylogenetically related to them (teeth and scales) suggest the use of comparative approaches to study these structures, and the current state of knowledge on developmental mechanisms involved in non-mammalian odontogenesis is reviewed. Expand
Developmental Constraints Conserve Evolutionary Pattern in an Osteichthyan Dentition
This work analyzes development from fossil hatchling forms of the Late Devonian dipnoan Andreyevichthys and compare with those of Neoceratodus, the Australian lungfish, reflecting a strongly conserved developmental pattern. Expand
The presence of a specific tooth-producing tissue, or dental lamina, is a synapomorphy of “higher” gnathostomes (chondrichthyans, acanthodians, and osteichthyans). Because the dental lamina is a softExpand
Jaws and teeth of the earliest bony fishes
Andreolepis and Lophosteus are not only the oldest but also the most phylogenetically basal securely identified osteichthyans known so far, indicating that they can be assigned to the stem group. Expand