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『科普』关于中部锦龟

2013-08-23 13:41阅读：

http://blog.sina.cn/dpool/blog/u/3729549050

很多人认为中锦系杂交锦龟，但其实是纯锦龟 资料中写的“过渡种”并不是指杂交，而是演化过程
中锦由东锦演化而来，（中锦）之后演化成西、南锦，所以说是'过渡种'
北美大地最先开始出现东锦，之后东锦向西部以及西南部蔓延（现在的西，中，南锦的分布地）
受到当地气候地理等因素影响，东锦开始演变
演变后的东锦即为中锦，特征如下：
头部白斑退化成线型，但不像西南锦那样的完全性线型
头部前两条线条蔓延至眼睛；幼体至成体都是如此
平行纹退化，但现在的中锦仍然保留有残余平行纹
背部边缘有少量类似西锦花纹
肚子出现花纹，形状类似龟蛋一样的椭圆形
不过中部地区的中锦没有继续进化，可能受到当地气候地理等诸多因素影响
演变停止了，于是就演变成了现在的中锦（说白了就是半成品东锦或西锦 『科普』关于中部锦龟）
西锦分布地的中锦继续进化，演化成了现在的西锦
不过由于其体质强健，适应力强，成为了4种锦龟里分布最广的锦龟
南锦分布地的就不用说了，但是演化的有点不好，栖息地很狭窄，体型小


还有一点要记住，西、南、中全部隶属东锦亚种，东锦是指明种，别搞错了
以下图片为中部锦龟

『科普』关于中部锦龟
『科普』关于中部锦龟
『科普』关于中部锦龟
『科普』关于中部锦龟
『科普』关于中部锦龟
拉丁学名：Chrysemys picta marginata Agassiz
中文名：中部锦龟
分布田纳西州东北部到纽约州，密歇根州，缅恩州都有分布
可冬眠，食性如其它锦龟




笔者在一外国论坛摘抄了部分资料，如下：
The Midland painted turtle (Chrysemys picta marginata) is a small to medium sized turtle capable of reaching straight carapace lengths of 5 to 9 inches. The body form is ‘classic basking’ style, very similar to a slider’s. The carapace is smooth and lightly domed. Its shell ranges from a black to olive green with a vestigial vertebral stripe. The marginalscutes are may be decorated with red bars, blotches and stripes. The carapace scutes may also display light red lines along the borders of the carapacial scutes.
Midland Painted skin color is usually black to light green; the forearms display broad red lines. The head and throat have prominent yellow lines running from the tip of the nose and mouth downwards across the face. These lines will often turn red as they progress down towards the neck.
The upper jaw has pronounced ‘tooth-like’ cusps, and the eyes are generally yellow with a horizontal bar running through the pupil; they often have a yellow line or blotch directly behind the eye. The plastron can range from tan to red and usually displays a large colorful blotched pattern that may take up most of the plastron in some individuals, but can also be greatly reduced in others (western painteds have a more elaborate plastron ‘color burst;’ this is absent in southern & eastern painteds). Note: The plastron in some may be a darker color due to staining from organic compounds in the environment.
Male Midlands are generally smaller and less domed than their female counterparts, reaching around 5 inches adult SCL. Males don’t show signs of plastral concavity as is the case with many other turtle species. Males have elongated front claws to aid in courtship and mating rituals. The tails are much longer than females and with the tail fully extended the cloaca will be past the edge of the carapace.
Many variations (& intergrades with other painted sub-species) of this sub-species are found in areas where their rangesoverlaps one another...leading to a blending of characteristics and frustration when trying to figure out what sub-species you actually have.

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