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A new ichnotaxon of fossil bird track from the Early Cretaceous Tianjialou Formation (Barremian-Albian), Shandong Province, China

机译:中国山东省白垩纪早期田家楼组(巴里米亚-阿尔比)的化石鸟踪迹的一个新的鱼龙分类

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A single set of 5 bird tracks was discovered in the Tianjialou Formation (Barremian-Albian) of Junan County, Shandong Province, China. After careful study we infer that it is a new type of bird tracks, and a new ichnoge-nus was erected and the name Shandongornipes was given. The characteristics of the new bird track are as follows: Moderately large tetradactyl footprints with well-developed hallux impression. Track width (about 5.8 cm) almost equal to track length (excluding hallux); total length of track (including hallux) 8.7 cm. The digit impressions are slender, with distal ends showing long sharp claw marks. Hallux posteriorly-directed, and hallux impressions well-developed. Digits Ⅱ, Ⅲ and Ⅳ point anteriorly, exhibiting mesaxonic asymmetry: divarication angle between Ⅱ and Ⅲ much larger than that of Ⅲ and Ⅳ, the former ranging from 91° to 118°, and the latter less than 30°. Divarication between digits Ⅱ and Ⅳ ranging from 128° to 142°. Without web structures. Digital pads recognizable, usually at least three in digits Ⅲ and Ⅳ, but sometimes only two due to preservation. The trackway shows slight positive (inward) rotation of feet. The bird tracks occur in association with abundant dinosaur tracks, and are believed to have formed in flood plain environments.
机译:在中国山东省Jun南县的田家楼组(巴里米亚-阿尔比)中发现了一组5条鸟类。经过仔细研究,我们推断这是一种新型的鸟径,并竖立了一种新的鱼ich,并命名为山东角orn。新的鸟类跟踪的特征如下:中等大小的四趾足迹,具有发达的拇趾印象。轨道宽度(约5.8厘米)几乎等于轨道长度(不包括拇指);轨道总长度(包括拇指)为8.7厘米。手指印模细长,远端显示长而尖的爪痕。拇趾向后定向,拇趾印象发达。 Ⅱ,Ⅲ,Ⅳ号指向前方,表现出中轴不对称性:Ⅱ,Ⅲ之间的分叉角远大于Ⅲ,Ⅳ,前者的夹角在91°至118°之间,而后者小于30°。数位Ⅱ和Ⅳ之间的分度范围为128°至142°。没有网络结构。可以识别的数字键盘,通常在数字Ⅲ和Ⅳ中至少三个,但有时由于保存而只有两个。轨道显示脚有轻微的正向(向内)旋转。鸟类的踪迹与丰富的恐龙踪迹有关,据信在洪泛平原环境中形成。

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