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Stem sarcopterygians have primitive polybasal fin articulation.
Biol Lett 2009; 5(3):372-5BL

Abstract

Among osteichthyans, basal actinopterygian fishes (e.g. paddlefish and bowfins) have paired fins with three endoskeletal components (pro-, meso- and metapterygia) articulating with polybasal shoulder girdles, while sarcopterygian fishes (lungfish, coelacanths and relatives) have paired fins with one endoskeletal component (metapterygium) articulating with monobasal shoulder girdles. In the fin-limb transition, the origin of the sarcopterygian paired fins triggered new possibilities of fin articulation and movement, and established the proximal segments (stylopod and zeugopod) of the presumptive tetrapod limb. Several authors have stated that the monobasal paired fins in sarcopterygians evolved from a primitive polybasal condition. However, the fossil record has been silent on whether and when the inferred transition took place. Here we describe three-dimensionally preserved shoulder girdles of two stem sarcopterygians (Psarolepis and Achoania) from the Lower Devonian of Yunnan, which demonstrate that stem sarcopterygians have polybasal pectoral fin articulation as in basal actinopterygians. This finding provides a phylogenetic and temporal constraint for studying the origin of the stylopod, which must have originated within the stem sarcopterygian lineage through the loss of the propterygium and mesopterygium.

Authors+Show Affiliations

Key Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, PO Box 643, Beijing 100044, People's Republic of China. zhumin@ivpp.ac.cnNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

19324642

Citation

Zhu, Min, and Xiaobo Yu. "Stem Sarcopterygians Have Primitive Polybasal Fin Articulation." Biology Letters, vol. 5, no. 3, 2009, pp. 372-5.
Zhu M, Yu X. Stem sarcopterygians have primitive polybasal fin articulation. Biol Lett. 2009;5(3):372-5.
Zhu, M., & Yu, X. (2009). Stem sarcopterygians have primitive polybasal fin articulation. Biology Letters, 5(3), pp. 372-5. doi:10.1098/rsbl.2008.0784.
Zhu M, Yu X. Stem Sarcopterygians Have Primitive Polybasal Fin Articulation. Biol Lett. 2009 Jun 23;5(3):372-5. PubMed PMID: 19324642.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stem sarcopterygians have primitive polybasal fin articulation. AU - Zhu,Min, AU - Yu,Xiaobo, Y1 - 2009/03/04/ PY - 2009/3/28/entrez PY - 2009/3/28/pubmed PY - 2009/7/11/medline SP - 372 EP - 5 JF - Biology letters JO - Biol. Lett. VL - 5 IS - 3 N2 - Among osteichthyans, basal actinopterygian fishes (e.g. paddlefish and bowfins) have paired fins with three endoskeletal components (pro-, meso- and metapterygia) articulating with polybasal shoulder girdles, while sarcopterygian fishes (lungfish, coelacanths and relatives) have paired fins with one endoskeletal component (metapterygium) articulating with monobasal shoulder girdles. In the fin-limb transition, the origin of the sarcopterygian paired fins triggered new possibilities of fin articulation and movement, and established the proximal segments (stylopod and zeugopod) of the presumptive tetrapod limb. Several authors have stated that the monobasal paired fins in sarcopterygians evolved from a primitive polybasal condition. However, the fossil record has been silent on whether and when the inferred transition took place. Here we describe three-dimensionally preserved shoulder girdles of two stem sarcopterygians (Psarolepis and Achoania) from the Lower Devonian of Yunnan, which demonstrate that stem sarcopterygians have polybasal pectoral fin articulation as in basal actinopterygians. This finding provides a phylogenetic and temporal constraint for studying the origin of the stylopod, which must have originated within the stem sarcopterygian lineage through the loss of the propterygium and mesopterygium. SN - 1744-9561 UR - https://www.unboundmedicine.com/medline/citation/19324642/Stem_sarcopterygians_have_primitive_polybasal_fin_articulation_ L2 - https://royalsocietypublishing.org/doi/full/10.1098/rsbl.2008.0784?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -