摘要
自贡大山铺恐龙化石坑中出土的李氏蜀龙(Shunosaurus lii)和天府峨眉龙(Omeisaurustianfuensis)均发现由尾端脊椎愈合膨大而成之纺锤形骨质尾锤。这一特征在蜥脚类中尚属首次记述。骨质尾锤是一种适应陆地生活之特殊构造。它作为一种防御武器,主要起防卫身体的作用。它的存在说明R.T.Bakker提出的蜥脚类是一类营陆地生活的恐龙的观点是正确的。
There have been 15 pieces of the bony tail club of sauropods found in the Lower Shaxi-
miao Formation of Middle Jurassic in the Dinosaurian Quarry of Dashanpu,Zigong,Sichuan
Province,China.Both of the two groups of sauropods in the Shunosaurus fauna of Dashan-
pu——Shunosaurus lii and Omeisaurus tianfuensis have a bony club at the end of the tail.It
has never been reported that sauropods have a bony tail club.This discovery shows that
sauropods are a group of terrestrial dinosaurs,and it proves that R.T.Bakker's theory is
probably correct.
The characteristics of the morphology and structure of these bony tail clubs are described
in this paper.The main features of the bony clubs are as follows:
The shape of the bony clubs is ellipspheroidal or spindle-shaped.The anterior and pos-
terior parts are narrow and middle part is inflated.These clubs are fused with 3—5 distal
caudal vertebrae.The fused lines between the vertebrae can be seen on the ventral part.The
neural spines of the anterior vertebrae of the bony clubs are present and low,and that of the
posterior vertebrae have disappeared.The neural foramen is small,runs through the whole
bony club,and forms a U-shaped trough at the end.The haemal arches and diapophysis have
disappeared.
The main function of the bony tail clubs of sauropods,like that of ankylosaurs,is for
defence.However,the tail clubs of sauropods and ankylosaurs are analogous organs.Their
origin and structure are different.
出处
《古脊椎动物学报》
CSCD
北大核心
1989年第3期219-224,241-242,共6页
Vertebrata Palasiatica
关键词
蜥脚类
尾锤
自贡大山铺
Zigong Sichuan Province
Sauropoda
Bony tail club
