Only Skin Deep -- for those with a Biological leaning


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hwchoy

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Jul 16, 2003
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Tampines, Singapore.
www.hexazona.com
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hope this is not inappropriate for ClubSnap. -- the those who has been keeping aquarium fishes but feels you want something deeper, more scientific interest into your hobby…


Meetings of the NUS DBS Biodiversity & Ecology Journal Club http://bejc.rafflesmuseum.net/

Only Skin Deep: Phylogeny and Evolution of Epidermal Characters in the Sisoridae

Ng Heok Hee
Fish Division, Museum of Zoology,
University of Michigan at Ann Arbor
USA

Wednesday, 16th August 2006; 10:00AM
Seminar Room 4

Blk S2, Level 2, Department of Biological Sciences
The National University of Singapore
Science Drive 4
Visitors may park at Carpark 10
See map http://rmbr.nus.edu.sg/RMBR.JPG

Host: Dr. Tan Swee Hee

About the Talk

The phylogenetic relationships of the Asian hillstream catfish family Sisoridae are examined in this study, using a combination of morphological, mitochondrial and nuclear gene sequence data. The composition of the family is also examined and the current hypothesis that the Asian Erethistidae (previously considered part of the Sisoridae) is the sister group of the Neotropical catfish family Aspredinidae is tested with morphological and molecular data. Aspects of the historical biogeography of the Sisoridae are also examined using divergence time estimate analyses. Some epidermal characters in the Sisoridae, viz. the tubercles on the sides of the body and the epidermal structures of the thoracic region, were examined using both light and scanning electron microscopy; their evolution and phylogenetic significance in the light of the phylogenetic hypothesis obtained are discussed.

About the Speaker

Ng Heok Hee is interested in the systematics of Asian freshwater fishes, with particular emphasis on the Siluriformes (catfishes). His primary research interest is understanding the phylogenetic relationships of Asian catfishes using both morphological and molecular approaches, as well as addressing problems of the historical biogeography of the group. In recent years, his research has focused on the relationships within a group of hillstream catfishes, the Sisoroidea, as well as examining the evolution of epidermal characters in the group. Heok Hee graduated from the National University of Singapore in 2000 with a Master of Science and recently obtained his doctorate from the University of Michigan.
 

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