推荐回答(1个)
星龟是那种甲壳带有明显辐射状花纹陆龟中的一员。在非洲陆龟和部分亚洲陆龟中,甲壳带有各种各样辐射状花纹的现象是相当普遍的。虽然这种花纹看起来很显眼,但在自然环境中,却是一种很好的保护色。在这些“星型花纹”陆龟中,有辐射、蛛网、马达加斯加平背陆龟、几何陆龟和南非星业龟等等。自爬虫文化兴起的那天起,所有这些美丽的“星型花纹”陆龟都是陆龟迷们梦想的宠物和商人手中的强手货。随着这些龟种栖息地的破坏和合法与非法的贸易,它们正遭受着灭顶之灾。在这些“星型花纹”陆龟中,星龟从数量上可算最多的了,其中很多产自斯里兰卡。
简介
大小:象龟属是一种中到大型的陆龟。最大的活体标本是个母龟,重7公斤,体长38厘米,但多数星龟的体形相对偏小。母龟一般比公龟大,公龟的体长很少有过20厘米的。对于性成熟期的星龟来说,两性的差异还是很大的。除了大小,母龟看上去更丰满圆润,腹甲平坦。公龟的尾巴相对较大,腹甲凹陷。肛门到尾甲盾的距离,公龟较宽。最近,我得到一个新消息,据说一只在印度的马哈拉施特拉饲养着的公龟――原先在古节拉特邦的加马那哥捕获――已经达到了10公斤重。
外观
星龟的底色是奶黄色中嵌入黑色或褐色的色块。注意:这种色块的组成使星龟有别于其它“星型花纹”陆龟。比如:辐射陆龟的花纹由黑的底色伴随轻微的黄色辐射状花纹组成。随着岁月的流失,由于磨损,辐射花纹越来越趋向与黑色。而星龟颜色中的黑色块却越来越多地被奶黄色所代替。
本人观察:这种现象在自然界很明显,野外成体的星龟花纹要比辐射陆龟亮丽的多,就是这个原因。而由于个人饲养,辐射陆龟的花纹被保存完好,磨损较少,不容易区分开。 相对于其它陆龟,星龟和象龟亚科的其它陆龟(如:苏)都存在隆背的现象。这种现象近似于由于营养不良或饲养不当所引起的隆背,但性质不同。这个特性在同一种群的星龟中也存在着广泛的不同――有些背甲圆润光滑,有些却有一个个小山包。这种隆背的成因或形成尚不明确,可能是基因的遗传,或是由于个体饮食结构的不同。有时,有些人说斯里兰卡星隆背而印度星不隆背。但据我观察:同样存在不隆背的斯里兰卡星,在印度次大陆捕获的星龟中,同样存在隆背的现象。个人认为,这种说法是出于商业利益,把隆背的龟等同于饲养不当或营养不良的,由此把那些不隆背的星龟卖个好价钱。
星龟的前爪有脚刺,后腿却缺乏这样的防护。腿的颜色是奶油黄或黄色,其间点缀着黑褐色或黑色不规则斑点。星龟的每个脚上有五个脚趾,母龟的后脚趾要比公龟的略长,并更弯曲,这有利于在坚硬和干燥的地面上挖巢穴。星龟的脑袋上亦散布着黑斑。分布和地区间差异。
分布和地区间差异
今天不译了,本人养星、黄喉、巴西和墨龟,另准备养豹。欢迎龟友们来信或加我MSN,一起来探讨养龟艺术。
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