| "The
Systematics of the Torrent Loaches (Balitoridae: Gastromyzon, Hypergastromyzon
and Neogastromyzon) of Borneo"
Tan Heok Hui
Department of Biological Sciences,
National University of Singapore.
Tuesday, 5th August 2003: 3.00pm
DBS Conference Room
Blk S3 Level 5, Department of Biological Sciences
National University of Singapore
Science Drive 4
Visitors may park at
Carpark 10
See
map
About the
Talk
The systematics of the genera Gastromyzon,
Hypergastromyzon and Neogastromyzon of the family Balitoridae (Teleostei:
Cypriniformes) are revised. All three genera are endemic to Borneo,
although there are superficially similar taxa in Indochina and southern
China. The Bornean genera possess a high count and enlarged size in
the pectoral and pelvic fins, fused pelvic fins and dorso-ventrally
flattened bodies. They occur in the headwater and hillstreams, in fast-flowing
water over a rocky substratum. All type material of the 13 known species
of Gastromyzon are re-described and split into 11 species groups based
on morphological characters, with another 23 new taxa discovered. The
identities of the two known species of Neogastromyzon are clarified
and four new species described. The genus Hypergastromyzon is
also examined. The biogeography of the dorso-ventrally flattened balitorid
fishes is discussed, and the ecology and biology of these balitorids
is also reviewed.
Phylogenetic analyses
using morphology and the 12S rRNA region of mtDNA were conducted to
investigate the phylogenetic relationships between 18 genera of balitorids
- Barbatula, Balitora, Crossostoma, Gastromyzon, Glaniopsis, Hemimyzon,
Homaloptera, Homalosoma, Liniparhomaloptera, Nemacheilus, Neogastromyzon,
Neohomaloptera, Protomyzon, Pseudogastromyzon, Schistura, Sewellia,
Sinogastromyzon and Vaillantella, using Psilorhynchus
(Cyprinidae: Psilorhynchinae) as the outgroup. The analyses
show that Gastromyzon and Neogastromyzon belong to
the same clade and most of the species groups presently recognised within
Gastromyzon are natural. A new classification for the Balitoridae
is proposed and the dorso-ventrally flattened body form is believed
to have evolved independently in Balitoridae at least twice.
ALL ARE WELCOME!
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Parking at Carpark 10
Seminar Room 3
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Seminar Room 4 (SR4)
Block S3, Level 2
Science Drive 4
Life Sciences Lab
7A-D
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Block S2, Level 3
Science Drive 4
Lecture Theatre 32
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Science Drive 4
Raffles Museum
Block S6, Level 3
Science Drive 2
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Meetings
of the Biodiversity & Ecology Journal Club,
2003
Eco@Woodlands
Tan Sen Min - "Heritage
of the Seas - Ancient mariners' tales to
sea-worthy vessels...tradewinds to rare fish of Siam". 2nd
August 2003
DBS Seminar
Paul Clark - "Natural History Museum, London - Business or Pleasure,
Sir?". 1st
August 2003
Tony Wu - "Silent Symphony Under the
Waves". 17th July 2003
Archived
meetings, Jul 2000 -Dec 2002
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