New fossil materials of hybodus (Chondrichthyes) in the Middle Jurassic found in Chuanjie Basin of central Yunnan Province
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摘要:
云南禄丰县川街盆地中侏罗统产出弓鲛鱼类化石后甸弓鲛（Hybodus houtienensis Young）、新庄弓鲛（新种）（Hybodus xinzhuangensis Sun）、川街弓鲛（新种）（Hybodus chuanjieensis Sun）。后甸弓鲛（Hybodus houtienensis Young）是中国发现最早的弓鲛鱼类之一，正型标本为破碎的鳍棘，副型标本为一枚牙齿齿冠。依据在川街盆地相同层位发现的新化石材料，对后甸弓鲛副型标本进行了增补，补充了描述，建立了2个弓鲛新种：新庄弓鲛与川街弓鲛，丰富了"后甸弓鲛带"弓鲛类群，并讨论了弓鲛属的生物地层、生活的古环境和地理分布特征。
Abstract:Chuanjie basin in Lufeng County of Yunnan Province produced hybodontoidea's fossils in Middle Jurassic strata, which include Hybodus houtienensis, Hybodus xinzhuangensis (New species), and Hybodus chuanjieensis (New species). Hybodus houtienensis is one of the earliest hybodontoidea found in China, the holotype consists of broken spines, and subtype specimen is a tooth crown. On the basis of the new fossil material found in the same strata of Chuanjie Basin, we have added Subtype specimens of the Hybodus houtienensis, also added the description about it; the authors set up two new hybodus species:Hybodus xinzhuangensis and Hybodus chuanjieensis, thus enriching the group of "houtienensis hybodus belt". The biostratigraphy of Hybodont, ancient environment of biostratigraphy and geographical distribution were also discussed.
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表 1 弓鲛牙齿测量数据
Table 1. The measurement data of Hybodus'teeth
种属 编号 齿宽/mm 主尖高度/mm 右齿尖3高度/mm 右齿尖2高度/mm 右齿尖1高度/mm 左齿尖1高度/mm 左齿尖2高度/mm 齿冠部保存高度/mm 齿根保存高度/mm 后甸弓鲛 DDYJZ003 8.63 3.75 1.13 1.38 1.88 0.94 DDYJZ008 10.47 4.69 2.66 1.64 1.72 0.94 DDYJZ005 7.00 2.43 1.25 1.06 0.38 DDYJZ002 10.25 3.88 2.25 2.50 1.25 DDYJZ011 16.25 5.63 2.75 1.13 2.88 1.63 DDYJZ004 13.5 5.88 2.75 0.88 0.75 新庄弓鲛 DDYJZ001 4.13 1.88 0.50 0.88 0.25 川街弓鲛 DDYJZ010 4.19 1.63 0.63 0.5 0.44 0.48 0.75 0.38 
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