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Pectoral fin and girdle development in the basal actinopterygians Polyodon spathula and Acipenser transmontanus.
J Morphol 2004; 262(2):608-28JM

Abstract

The pectoral fins of Acipenseriformes possess endoskeletons with elements homologous to both the fin radials of teleosts and the limb bones of tetrapods. Here we present a study of pectoral fin development in the North American paddlefish, Polyodon spathula, and the white sturgeon, Acipenser transmontanus, which reveals that aspects of both teleost and tetrapod endoskeletal patterning mechanisms are present in Acipenseriformes. Those elements considered homologous to teleost radials, the propterygium and the mesopterygial radials, form via subdivision of an initially chondrogenic plate of mesenchymal cells called the endoskeletal disc. In Acipenseriformes, elements homologous to the sarcopterygian metapterygium develop separately from the endoskeletal disc as an outgrowth of the endoskeletal shoulder girdle that extends into the posterior margin of the finbud. As in tetrapods, the elongating metapterygium and the metapterygial radials form in a proximal to distal order as discrete condensations from initially nonchondrogenic mesenchyme. Patterns of variation seen in the Acipenseriform fin also correlate with putative homology: all variants from the "normal" fin bauplan involved the metapterygium and the metapterygial radials alone. The primary factor distinguishing Polyodon and Acipenser fin development from each other is the composition of the endoskeletal extracellular matrix. Proteoglycans (visualized with Alcian Blue) and Type II collagen (visualized by immunohistochemistry) are secreted in different places within the mesenchymal anlage of the fin elements and girdle and at different developmental times. Acipenseriform pectoral fins differ from the fins of teleosts in the relative contribution of the endoskeleton and dermal rays. The fins of Polyodon and Acipenser possess elaborate endoskeletons overlapped along their distal margins by dermal lepidotrichia. In contrast, teleost fins generally possess relatively small endoskeletal radials that articulate with the dermal fin skeleton terminally, with little or no proximodistal overlap.

Authors+Show Affiliations

Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois 60637, USA. mdavis@itsa.ucsf.eduNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

15376275

Citation

Davis, Marcus C., et al. "Pectoral Fin and Girdle Development in the Basal Actinopterygians Polyodon Spathula and Acipenser Transmontanus." Journal of Morphology, vol. 262, no. 2, 2004, pp. 608-28.
Davis MC, Shubin NH, Force A. Pectoral fin and girdle development in the basal actinopterygians Polyodon spathula and Acipenser transmontanus. J Morphol. 2004;262(2):608-28.
Davis, M. C., Shubin, N. H., & Force, A. (2004). Pectoral fin and girdle development in the basal actinopterygians Polyodon spathula and Acipenser transmontanus. Journal of Morphology, 262(2), pp. 608-28.
Davis MC, Shubin NH, Force A. Pectoral Fin and Girdle Development in the Basal Actinopterygians Polyodon Spathula and Acipenser Transmontanus. J Morphol. 2004;262(2):608-28. PubMed PMID: 15376275.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pectoral fin and girdle development in the basal actinopterygians Polyodon spathula and Acipenser transmontanus. AU - Davis,Marcus C, AU - Shubin,Neil H, AU - Force,Allan, PY - 2004/9/18/pubmed PY - 2005/2/11/medline PY - 2004/9/18/entrez SP - 608 EP - 28 JF - Journal of morphology JO - J. Morphol. VL - 262 IS - 2 N2 - The pectoral fins of Acipenseriformes possess endoskeletons with elements homologous to both the fin radials of teleosts and the limb bones of tetrapods. Here we present a study of pectoral fin development in the North American paddlefish, Polyodon spathula, and the white sturgeon, Acipenser transmontanus, which reveals that aspects of both teleost and tetrapod endoskeletal patterning mechanisms are present in Acipenseriformes. Those elements considered homologous to teleost radials, the propterygium and the mesopterygial radials, form via subdivision of an initially chondrogenic plate of mesenchymal cells called the endoskeletal disc. In Acipenseriformes, elements homologous to the sarcopterygian metapterygium develop separately from the endoskeletal disc as an outgrowth of the endoskeletal shoulder girdle that extends into the posterior margin of the finbud. As in tetrapods, the elongating metapterygium and the metapterygial radials form in a proximal to distal order as discrete condensations from initially nonchondrogenic mesenchyme. Patterns of variation seen in the Acipenseriform fin also correlate with putative homology: all variants from the "normal" fin bauplan involved the metapterygium and the metapterygial radials alone. The primary factor distinguishing Polyodon and Acipenser fin development from each other is the composition of the endoskeletal extracellular matrix. Proteoglycans (visualized with Alcian Blue) and Type II collagen (visualized by immunohistochemistry) are secreted in different places within the mesenchymal anlage of the fin elements and girdle and at different developmental times. Acipenseriform pectoral fins differ from the fins of teleosts in the relative contribution of the endoskeleton and dermal rays. The fins of Polyodon and Acipenser possess elaborate endoskeletons overlapped along their distal margins by dermal lepidotrichia. In contrast, teleost fins generally possess relatively small endoskeletal radials that articulate with the dermal fin skeleton terminally, with little or no proximodistal overlap. SN - 0362-2525 UR - https://www.unboundmedicine.com/medline/citation/15376275/Pectoral_fin_and_girdle_development_in_the_basal_actinopterygians_Polyodon_spathula_and_Acipenser_transmontanus_ L2 - https://doi.org/10.1002/jmor.10264 DB - PRIME DP - Unbound Medicine ER -