Discussions on the Fossil “Tadpole” from the Daohugou Biota
详细信息
- 责任者：Huang Diying (State Key Laboratory of Palaeobiology and Stratigraphy ; Nanjing Institute of Geology and Palaeontology ; Chinese Academy of Sciences ; Nanjing 210008 ; China)
- 刊名：Acta Palaeontologica Sinica
- 出版年：2013
- 卷期：52(2)
- 关键词：两栖纲 ; Amphibia ; 蝉类 ; cicada ; 内蒙古 ; Inner Mongolia
- 页码：p.141-145
- 图表：illus., 22 refs.
- 分类号：1102
- issnNo：ISSN0001-6616
- isbnNo：CN32-1188/Q
摘要
The Middle Jurassic Daohugou Biota has yielded abundant fossil insects, plants and various vertebrate fossils. The vertebrates from Daohugou are dominated by two amphibians namely Jeholotriton paradoxus and Chunerpeton tianyiensis. A tadpole fossil has been described on the basis of a single specimen as the unique sample of Salientia has not been reported from Daohugou Biota to date. However, despite its soft tissues have been well preserved, this specimen preserved no skeletal features, contrary to the condition in even juvenile salamanders from Daohugou and to other fossil tadpoles such as those from the Miocene Shanwang Formation. On the analysis of general characters, this "tadpole" is in fact a fragment of an insect (Hemiptera: Cicadomorpha). It preserved the head, proand midthorax, and fore legs of the insect. The particular thin and straight tail of the "tadpole" is actually the rostrum of the insect compressed forward due to the disorganization process during transportation. The hind legs of the "tadpole" displayed a series of characters on femur, tibia, and tarsus of insects. Especially, the tarsal elements in this specimen is by no means similar to that of a frog (with two parallel bones, i.e., the tibiale and fibulare), but identical to that of an insect (with three successive tarsomeres). Representatives of Cicadomorpha from Daohugou mainly include three groups, Palaeontinidae, Tettigarcti-dae, and Procercopidae. This sample of "tadpole" more resembles a large palaeontinid fossil. Most described palaeontinid specimens from Daohugou are preserved as isolated fore wings or hind wings, which can be an additional evidence to reveal that these insects have been decomposed in preservation. With the re-identification of the "tadpole" specimen as a cicadomorph insect, there should be, to date, no anuran record at the Middle Jurassic Daohugou locality, as well as in the pre-Cretaceous strata in China.
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