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Polynemidae
THREADFINS
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Polydactylus opercularis
© Copyright Ross Robertson, 2006 · 12
Polydactylus opercularis
Polydactylus approximans
© Copyright Ross Robertson, 2006 · 12
Polydactylus approximans

Polynemidae
© Copyright Ross Robertson, 2006 · 12
Polynemidae
español

Overview
Main identification features
  • snout: translucent, overhanging
  • eyes large, with fatty eyelid
  • 2 short, well separated ds
  • pectoral with long 5-9 free filaments
FAMILY POLYNEMIDAE

THREADFINS, BOBOS

Threadfins have a bluntly rounded snout that overhangs a ventral mouth; a large fatty eyelid; there are two separate dorsal fins, and the tail is deeply forked. The common name is derived from their peculiar pectoral rays. The pectoral fin is divided into a "normal" upper section with the rays attached to the fin membrane and a detached lower section with 3-7 free, thread-like rays. The number of free pectoral rays is diagnostic for separating many of the species.

Threadfins are usually encountered near the coast, often in river mouths or brackish mangrove estuaries. Their diet consists of shrimps, crabs, polychaete worms, and other benthic invertebrates. They are considered good eating and are often seen in fish markets throughout the region.

The family is worldwide and contains about 33 species divisable into seven genera, occurring in all tropical and subtropical seas. Only two endemic species from one genus are found in our area.


References
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  • Jordan , D.S. and Gilbert, C.H., 1882., List of Fishes now in the Museum of Yale College, Collected by Prof. Frank H. Bradley, at Panama, with Descriptions of Three New Species., Proc. U.S. Nat. Mus., 5:620-632.
  • Jordan , D.S. and Gilbert, C.H., 1883., Catalogue of the fishes collected by Mr. John Xantus at Cape San Lucas, which are now in the United States National Museum, with descriptions of eight new species., Proc. U.S. Nat. Mus., 5(1882):353-371.
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  • Lay , G. T. and Bennett, E. T., 1839., Fishes. Pp. 41-75, Pls. 15-23. In: The zoology of Captain Beechey's voyage... to the Pacific and Behring's Straits... in 1825-28. London., Zool. Beechey's Voyage,.
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  • Ricker, K.E., 1959., Mexican shore and pelagic fishes collected from Acapulco to Cape San Lucas during the 1957 cruise of the "Marijean"., Univ. Brit. Columbia Inst. Fish., Mus. Contrib., 3:18pp.
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Acknowledgements

I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.


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