臺灣博碩士論文加值系統

魨形目(tetraodontiformes)可分類為9科101屬約365種,由於其形態的高度岐異性,在魚類中形成相當獨特的一群.以往形態學的研究對魨形目的親緣關係提供了諸多但不相容的說法,且其起源也被認為有刺尾鯛亞目及的鯛目.本研究以粒線體DNA之12S rRNA片段的序列來分析魨形目8科19種的親緣關係並以刺尾鯛亞目,的鯛目,金眼鯛目為假想的姊妹群以分析其起源,得到以下的結果與推論:(一)魨形目可分為三單系群:第一群包含擬三棘魨科,箱魨科;第二群包含鱗魨科及單棘魨科;第三群包含翻車魨科,四齒魨科,二齒魨科,三棘魨科.(二)擬三棘魨科和三棘魨科並非姊妹群,它們亦非魨形目其它類群的姊妹群.(三)擬三棘魨科和箱魨科為魨形目其他類群的姊妹群.(四)四齒魨超科中,翻車魨為其它三科的姊妹群.(五)刺尾鯛亞目最有可能為魨形目的原始姊妹群.(六)以粒線體DNA之12S rRNA片段分析魨形目內或科間的關係是一個良好的工具,但較不適於分析屬以下成員的親緣關係.

Tetraodontiformes is a particular group because of its high morphological diversity. Phylogenetic relationships of tetraodontiformes based on morphologic information are still a subject of controversy. Furthermore, bothAcanthurids and Zeiformes have been considered to be their putative ancestor.In an attempt to elucidate , their phylogenetic relationships, mtDNA 12S rRNAsequneces of 8 families 19 species of tetraodontiformes were analysed and thedata suggest that: (1)Tetraodontiformes can be subdivided into three monophyleticgroups, the first including Triacanthodidae and Ostraciidae; the second includingBalistidae and Monacanthidae; the third including Tetraodontidae, Diodontidae, Triacanthodidae and Molidae. (2)Triacanthidae and Triacanthodidae are not sistergroups, and they are not the plesiomorphic sister group of all other tetraodontiformes. (3)Ostraciidae whereas Triacanthodidae is the sister group of other tetraodontiformes.(4)Molidae is the sister group of the remaining Tetraodontidea. (5)Acanthuroideiis most likely the sister group of Tetraodontiformes. (6)The 12S rRNA is an appropriate tool for resolving the phylogenetic relationships of families and suborders of Tetraodontiformes, but not of its genera.-1 -aPhylogenetic relationships of Tetraodontiformes based on mitochondrial 12S ribosomal DNA Sequences