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Issue:ISSN 1000-7083
          CN 51-1193/Q
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Your Position :Home->Past Journals Catalog->1994 Vol.13 No.4

A Study on Vomerine Teeth Pattern of the Genus Liua, with Revised Diagnoses of Liua and Ranodon (Cadata : Hynobiidae)
Author of the article:ZHAO Er-mi
Author's Workplace:(Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041)
Key Words:Liua; Ranodon; vomerine teeth series
Abstract:
The author has examined the type and two paratypes of Hynobius shihi Liu, 1950 (=Liua shihi) kept in the Field Museum of Natural History, Chicago, USA, and 28 specimens of the same species within China. A description of the pattern of vomerine teeth series of Lius shihi is given The mumber of vomerine teeth on cach side is 7 to 14 (mostly 9 to 13), its posterior end began from the level of the middle of choana. In larva, they arranged between choanae in two slightly oblique, widely separated series extending forward far beyond the choana. During metamorphosis the anterior section of vomerine teeth series turned inside forming a right angle or acute angle in various degree (Figs. 1 & 2). This characteristics of vomerine teeth of the genus Lius is much more different from those of the other known genera in Hynobiidae. The validity of the genus name Liua is also discussed in detail. During 1984 to 1989 the author has examined the syntype of Ranodon sibiricus Kessler, 1866 and the type of R. kozevenikovi Nicolsky 1918 (= R. sibiricus) both kept in the Zoological Museum of Moscow University, Moscow, Russia. And another 18 specimens of R. sibiricus kept separately in California Academy of Science, San Francisco, USA; Field Museum of Natural History at Chicago, USA; Natural History Museum of Basel, Switzerland, and Zoologiches Forschungsinstitutund Umseum Alexander Koenig at Bonn, Germany. Based on detail discussion on characters of the genera Liua and Ranodon, the author revised the diangnoses of these two genera as follows.
Genus Ranodon Kessler, 1866
Diagnosis: Hynobiidae, with a premaxillary fontanelle; vomerine teeth in two short separated series between choanae, not beyond it; without labial fold, margin of upper jaw straight or slightly curved (larva with labial fold); no horny covering to palms and soles; diploid chromosomes 2n=66; mainly terrestrial during non-breeding season.
Species included: sibiricus Kessler, 1866, tsinpaensis Liu and Hu, 1966 [including synonym Pseudohynobius flavomaculatus (Fei and Ye, 1982)].
Genus Liua Zhao and Hu, 1983
Diagnosis: Hynobiidae, with a premaxillary fontanelle; vomerine teeth in two right or acute angle separated series (larva in two short, slightly oblique series), beginning from the level of middle of choana and extending forward far beyond it; labial fold well developd; horny covering to palms and soles; diploid chromosome number 2n=64; mainly aquatic during non-breeding season.
Species included: shihi Liu, 1950 [including synonym Ranodon wushanensis Liu, Hu, and Yang, 1960].
Acknowledgements:The author would express his sincere thanks to CAS (USA), FMNH (USA), NHMB (Switzerland), ZFMK (Germany), ZMMU (Russia) for permitting to examine specimens.
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