Tags

Type your tag names separated by a space and hit enter

First discovery of a primitive coelacanth fin fills a major gap in the evolution of lobed fins and limbs.
Evol Dev 2007 Jul-Aug; 9(4):329-37ED

Abstract

The fossil record provides unique clues about the primitive pattern of lobed fins, the precursors of digit-bearing limbs. Such information is vital for understanding the evolutionary transition from fish fins to tetrapod limbs, and it guides the choice of model systems for investigating the developmental changes underpinning this event. However, the evolutionary preconditions for tetrapod limbs remain unclear. This uncertainty arises from an outstanding gap in our knowledge of early lobed fins: there are no fossil data that record primitive pectoral fin conditions in coelacanths, one of the three major groups of sarcopterygian (lobe-finned) fishes. A new fossil from the Middle-Late Devonian of Wyoming preserves the first and only example of a primitive coelacanth pectoral fin endoskeleton. The strongly asymmetrical skeleton of this fin corroborates the hypothesis that this is the primitive sarcopterygian pattern, and that this pattern persisted in the closest fish-like relatives of land vertebrates. The new material reveals the specializations of paired fins in the modern coelacanth, as well as in living lungfishes. Consequently, the context in which these might be used to investigate evolutionary and developmental relationships between vertebrate fins and limbs is changed. Our data suggest that primitive actinopterygians, rather than living sarcopterygian fishes and their derived appendages, are the most informative comparators for developmental studies seeking to understand the origin of tetrapod limbs.

Authors+Show Affiliations

Committee on Evolutionary Biology, University of Chicago, 1025 E 57th St., Chicago, IL 60637, USA. mattf@uchicago.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

17651357

Citation

Friedman, Matt, et al. "First Discovery of a Primitive Coelacanth Fin Fills a Major Gap in the Evolution of Lobed Fins and Limbs." Evolution & Development, vol. 9, no. 4, 2007, pp. 329-37.
Friedman M, Coates MI, Anderson P. First discovery of a primitive coelacanth fin fills a major gap in the evolution of lobed fins and limbs. Evol Dev. 2007;9(4):329-37.
Friedman, M., Coates, M. I., & Anderson, P. (2007). First discovery of a primitive coelacanth fin fills a major gap in the evolution of lobed fins and limbs. Evolution & Development, 9(4), pp. 329-37.
Friedman M, Coates MI, Anderson P. First Discovery of a Primitive Coelacanth Fin Fills a Major Gap in the Evolution of Lobed Fins and Limbs. Evol Dev. 2007;9(4):329-37. PubMed PMID: 17651357.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - First discovery of a primitive coelacanth fin fills a major gap in the evolution of lobed fins and limbs. AU - Friedman,Matt, AU - Coates,Michael I, AU - Anderson,Philip, PY - 2007/7/27/pubmed PY - 2007/9/28/medline PY - 2007/7/27/entrez SP - 329 EP - 37 JF - Evolution & development JO - Evol. Dev. VL - 9 IS - 4 N2 - The fossil record provides unique clues about the primitive pattern of lobed fins, the precursors of digit-bearing limbs. Such information is vital for understanding the evolutionary transition from fish fins to tetrapod limbs, and it guides the choice of model systems for investigating the developmental changes underpinning this event. However, the evolutionary preconditions for tetrapod limbs remain unclear. This uncertainty arises from an outstanding gap in our knowledge of early lobed fins: there are no fossil data that record primitive pectoral fin conditions in coelacanths, one of the three major groups of sarcopterygian (lobe-finned) fishes. A new fossil from the Middle-Late Devonian of Wyoming preserves the first and only example of a primitive coelacanth pectoral fin endoskeleton. The strongly asymmetrical skeleton of this fin corroborates the hypothesis that this is the primitive sarcopterygian pattern, and that this pattern persisted in the closest fish-like relatives of land vertebrates. The new material reveals the specializations of paired fins in the modern coelacanth, as well as in living lungfishes. Consequently, the context in which these might be used to investigate evolutionary and developmental relationships between vertebrate fins and limbs is changed. Our data suggest that primitive actinopterygians, rather than living sarcopterygian fishes and their derived appendages, are the most informative comparators for developmental studies seeking to understand the origin of tetrapod limbs. SN - 1520-541X UR - https://www.unboundmedicine.com/medline/citation/17651357/First_discovery_of_a_primitive_coelacanth_fin_fills_a_major_gap_in_the_evolution_of_lobed_fins_and_limbs_ L2 - https://doi.org/10.1111/j.1525-142X.2007.00169.x DB - PRIME DP - Unbound Medicine ER -