ZFIN Image: Daane et al., 2021, Fig. 1

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Figure Caption

Fig. 1

Evolution of fin allometry and gliding behavior in Beloniformes

(A) Lateral and dorsal views of a flying fish, Cypselurus callopterus, highlighting elongated pectoral (black arrowhead) and pelvic fins (white arrowhead) that act as an airfoil to enable aerial gliding behavior. The asymmetry of the caudal fin (hypocercal) aids in above-water propulsion (gray arrowhead).

(B) Static allometry of pectoral fins in flying fishes (Exocoetidae; C. furcatus, E. volitans, and H. rondeleti) compared to sauries and needlefish (B. belone and S. marina) and halfbeaks (H. unifasciatus and H. brasiliensis). The “flying halfbeaks” (E. velox and O. micropterus) also exhibit aerial gliding behavior and have an intermediate pectoral fin length relative to the fishes of Exocoetidae.

(C) Phylogeny of the beloniforms sequenced in this study. ‡ indicates lineages of flying halfbeak. All nodes were supported with a quadpartition posterior probability of 1.00.

Acknowledgments

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