【整理】鱼龙食谱讨论

蓝藻脊

回复 16# 鸿穹神皇上帝


    恩，第二张图上可以清楚的看到颅顶肌肉附着的位置，感觉Contectopalatus在肌肉量上胜过其他鱼龙
后三叠纪鱼龙似乎普遍偏少，以大眼鱼龙为最

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补充几种鱼龙的precaudal length/longest rib，计算体重的话用得上
Suevoleviathan disinteger（SMNS 15390）      2.273
Temnodontosaurus trigonodon（SMNS 15950） 2.564
Eurhinosaurus longirostris（GPIT 1025/18/1）   2.5
Stenopterygius quadriscissus（FSF R4154）     1.613
Ophthalmosaurus icenicus（PMAG R340）       1.266

鸿穹神皇上帝

如果16米的泰曼鱼龙的话，那么头骨大小实在是恐怖了。

蓝藻脊

根据狭翼鱼龙2.4米165kg推一下，9米的泰曼大约3.5吨，很瘦了，直接用下面图片的长高比来推也不会超过等长大眼鱼龙的一半。16米大约20吨，不会超过30吨

sobek

在我印象里面，一直以为鱼龙都是以鱼类跟头足类为食的，原来有那么多种类可以捕食大型的猎物甚至其他种类的海爬

蓝藻脊

根据最新的东西的一点补充：
分类调整：
萨斯特鱼龙属Shastasaurus的几个种同物异名
Shastasaurus liangae:
=Guanlingsaurus liangae

Shastasaurus pacificus:
=Shastasaurus alexandrae
=Shastasaurus osmonti

Shastasaurus sikkanniensis:
=Shonisaurus sikkanniensis

萨斯特鱼龙属这三个种的进食现在被认为都是类似于西卡尼的抽吸式
=============================================

卡洛维龙属Callawayia的几个种的同物异名
Callawayia neoscapularis
=Shastasaurus neoscapularis

Callawayia altispinus
=Shastasaurus altispinus

=============================================

贵州鱼龙仍然作为一个单独的属，而不是让邓氏贵州鱼龙Guizhouichthyosaurus tangae并入萨斯特鱼龙
贵州鱼龙和卡洛维龙都算是高等的Parvipelvia

蓝藻脊

再添加一个重要的表格

可以自己计算得出一些东西


短鳍鱼龙
上表中的Grendelius就是短鳍鱼龙Brachypterygius
短鳍鱼龙吻部很粗，牙齿大，被认为咬合力也比较大
其他的测量数据上表中有

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对上一楼表格的解释以及一些鱼龙测量方面的东西
Tooth length index可以计算牙齿长度

A. Continuous
1. Orbital ratio: ratio of orbital diameter to jaw length (HIL).
2. Snout ratio: ratio of snout length to jaw length (J/L).
3. Premaxillary ratio: ratio of premaxillary segment to jaw length (I/L).
4. Prenarial ratio: ratio of prenarial segment to to jaw length (B/L).
5. Maxillary tooth count: mean number of maxillary teeth.
6. Postorbital ratio: ratio of postorbital segment to jaw length (D/L).
7. Orbital position index: ratio of distance between centre of orbit and hindmost point of skull to distance between centre of orbit and most anterior point of skull (CIA).
8. Jaw depth ratio: ratio of jaw depth, measured at midpoint of jaw, to jaw length (G/L).
9. Snout depth ratio: ratio of snout depth, measured at midpoint of snout, to jaw length (E/L).
10. Tooth density index: number of upper and lower teeth counted in 10% of jaw length,centred at midpoint of snout (F).
11. Tooth length index: 10 x crown length of longest tooth divided by jaw length.

B. Multistate
12. External naris shape: petaloid (Fig. 5A), markedly elongate (Fig. 5B), or curviform (Fig. 5C).
13. Extracondylar extent: Extracondylar area (6) is much less extensive than condylar area (4) (Fig. 2A); areas are approximately equal (Fig. 2D), or extracondylar area is much more extensive than condylar area.

C. Dichotomous
14. Skull profile: rostrum grades gently into cranium (Fig. 5D) or is demarcated from cranium (Fig. 5E).
15. Condylar differentiation : basioccipital condyle is clearly defined and set off from extracondylar area (Fig. 2D) or is not (Fig. 2A).
16. Position of stapedial facet: stapedial facet (3) of basioccipital extends ventrally (Fig. 2D), or does not (Fig. 2A).
17. Basioccipital profile: anterior surface (5) of basioccipital is flat (fig. 2B), or convex (Fig. 2E).
18. Basioccipital peg: anterior surface of basioccipital is often extended into a peg (McGowan 1973a, p. 12, fig. 2). Peg (7) is well developed (Fig. 2E), weakly developed, or absent (Fig. 2B).

那个烧鸡

有些看不太懂，鱼龙的基础还是得先恶补一下。

chenfei571826

太感谢化石网了  对鱼龙化石有了解了许多新知识

chenfei571826

我的家乡就有10多米的哦  哎哟  好神奇  原来这么大一只啊  几十吨啊

无名化石

好贴，果然精华，学习了

悟石馆

好贴、好贴！非常感谢楼主的分享！！

无名化石

沮河

好贴好图好文章