Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

A New Species of Hemisilurus (Siluriformes, Siluridae) from the Mekong River, with Comments on Its Relationships and Historical Biogeography

Alan H. Bornbusch and John G. Lundberg
Copeia
Vol. 1989, No. 2 (May 23, 1989), pp. 434-444
DOI: 10.2307/1445440
Stable URL: http://www.jstor.org/stable/1445440
Page Count: 11
  • Read Online (Free)
  • Download ($12.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A New Species of Hemisilurus (Siluriformes, Siluridae) from the Mekong River, with Comments on Its Relationships and Historical Biogeography
Preview not available

Abstract

Hemisilurus mekongensis n. sp. is described from the middle Mekong River basin. It differs from all other species of Hemisilurus in having fewer anal- and more pectoral-fin rays and a single vomerine tooth patch. Phylogenetic analysis shows that H. mekongensis and H. moolenburghi (from Borneo and Sumatra) are sister species that are distinguished from H. heterorhynchus (of which H. chaperi is a junior synonym) by a smaller eye, absence of pectoral-spine enlargement in males, and a longer maxillary barbel that in large females is distally expanded as a broad membrane that may separate into several fine filaments. Allopatric distributions of H. mekongensis and H. moolenburghi indicate a post-Pleistocene vicariance between drainages of mainland southeast Asia and the Indonesian islands. Sympatry among Hemisilurus species and Ceratoglanis, the sister group to Hemisilurus, indicates post-speciation dispersal between Sunda drainages during lowered Pleistocene sea levels.

Page Thumbnails

  • Thumbnail: Page 
434
    434
  • Thumbnail: Page 
435
    435
  • Thumbnail: Page 
436
    436
  • Thumbnail: Page 
437
    437
  • Thumbnail: Page 
438
    438
  • Thumbnail: Page 
439
    439
  • Thumbnail: Page 
440
    440
  • Thumbnail: Page 
441
    441
  • Thumbnail: Page 
442
    442
  • Thumbnail: Page 
443
    443
  • Thumbnail: Page 
444
    444