Fish with fingers?

  title={Fish with fingers?},
  author={Edward B. Daeschler and Neil H. Shubin},
Fingers and toes were long thought to be novelties associated with the invasion of land by tetrapods. The recent identification of a variety of aquatic specializations in some early tetrapods has provoked a debate on whether digits arose in primarily terrestrial or aquatic animals,. We recently discovered a pectoral fin of a lobe-finned fish (Fig. 1a, b) that is remarkably similar to tetrapod limbs. This discovery reveals that major tetrapod novelties are also seen in the paddles of some… 

From Fins to Fingers

The implications of a new fossil find of a humerus from a Devonian tetrapod that sheds light on the anatomical and functional changes taking place in the tetrapOD lineage during this period are discussed.

Pectoral fins of rhizodontids and the evolution of pectoral appendages in the tetrapod stem-group

The pectoral fin skeleton of Rhizodus hibberti, a derived member of the Rhizodontida, is described in detail for the first time, showing that muscular processes of the humerus may have appeared later in tetrapod evolution than previously thought.

The tetrapod limb: a hypothesis on its origin.

The paleontological evidence for the fin-limb transition is reviewed and it is concluded that the innovation associated with evolution of the tetrapod limb is the zeugopodial-mesopodials transition.

Early tetrapod evolution.

  • CoatesRutaMilner
  • Environmental Science, Biology
    Trends in ecology & evolution
  • 2000

Unique pelvic fin in a tetrapod-like fossil fish, and the evolution of limb patterning

The fossil fish Rhizodus hibberti, a member of the tetrapod stem group, shows a unique skeletal pattern in the pelvic fin that implies that the developmental patterning mechanisms seen in living tetrapods, now highly constrained, evolved from mechanisms flexible enough to accommodate variation in the zeugopod (even between pectoral and pelvic fins), while also allowing each element to have a unique morphology.

A complete primitive rhizodont from Australia

The new evidence shows that rhizodonts are more remote from tetrapods than are osteolepiform and elpistostegid lobe-fin fishes and the pectoral fin of Sauripteris should not be used as a model limb precursor.

Fins to limbs: what the fossils say 1

SUMMARY A broad phylogenetic review of fins, limbs, and girdles throughout the stem and base of the crown group is needed to get a comprehensive idea of transformations unique to the assembly of the

Perspectives on the evolutionary origin of tetrapod limbs.

This synthesis of developmental and evolutionary biology has the potential to unveil the sequence of molecular changes that culminated in the adoption of the basic tetrapod limb plan.

The pectoral fin of Tiktaalik roseae and the origin of the tetrapod limb

The pectoral appendage of a member of the sister group of tetrapods, Tiktaalik roseae, is described, which is morphologically and functionally transitional between a fin and a limb.



The origin and early diversification of tetrapods

Devonian tetrapods were more fish-like than believed previously, whereas Lower Carboniferous tetrapod faunas contain early representatives of the amphibian and amniote lineages.

A new rhizodontiform fish from the Early Carboniferous of Victoria, Australia, with remarks on the phylogenetic position of the group

The skull roof of Barameda, gen. nov., differs from that of Osteolepiformes in having a larger extratemporal bone that contacts the intertemporal, by the overlap areas on the interTemporal, and in having fewer snout bones.