排序方式: 共有55条查询结果,搜索用时 148 毫秒
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务川臭蛙仅分布于贵州省务川县溶洞内,属极危物种.以牛蛙为对照,通过形态解剖学和组织学方法对务川臭蛙的皮肤和吸盘结构进行研究,结果显示,务川臭蛙头部背侧、后肢背侧以及躯干腹侧皮肤总厚度分别为372.50 μm±29.7 μm、453.25 μm ± 13.9 μm及237.92 μm±31.8 μm,各部分皮肤真皮层所占比例分别为(88.86±1.41)%、(90.65 ±0.81)%和(86.59±1.77)%,其中分布着大量的颗粒腺和粘液腺;前后肢每个指(趾)末端的吸盘,腹面有明显的柱状凸起表皮结构,其间有小孔和粘液腺,是务川臭蛙在溶洞壁上攀爬捕食的结构基础.务川臭蛙具有的特殊生理结构,是珍贵的遗传资源,应当加强科学保护. 相似文献
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通过人工受精的方法获得的凹耳臭蛙(Odorrana tormota)的早期胚胎及胚后幼体的发育过程,根据胚胎发育过程中的形态及生理特征变化规律进行分期。把凹耳臭蛙的发育过程分成两个阶段:1)早期胚胎发育阶段,即从蛙卵受精到鳃盖完成期,在18~23℃水温下,凹耳臭蛙早期胚胎发育阶段历时324h;2)蝌蚪发育阶段,即从鳃盖完成期结束到尾部被完全吸收,本阶段在20~24℃水温条件下历时1207h。凹耳臭蛙蝌蚪未发现腹吸盘特征,从形态特征上支持了分子系统分类学将之从湍蛙属划出的观点。实验中发现,多数胚胎在8细胞期为纬裂,16细胞期为经裂,同时有小部分胚胎(1.5%)在8细胞期为经裂,16细胞期为纬裂。该文进一步讨论了影响卵裂率、孵化率、发育速度,以及生态适应的因素。 相似文献
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Body surface area(BSA)was regarded as a more readily quantifiable parameter relative to body mass in the normalization of comparative biochemistry and physiology.The BSA prediction has attracted unceasing research back more than a century on animals,especially on humans and rats.Few studies in this area for anurans were reported,and the equation for body surface area(S)and body mass(W):S=9.9 W 0.56,which was concluded from toads of four species in 1969,was generally adopted to estimate the body surface areas for anurans until recent years.However,this equation was not applicable to Odorrana grahami.The relationship between body surface area and body mass for this species was established as:S=15.4 W 0.579.Our current results suggest estimation equations should be used cautiously across different species and body surface area predictions on more species need to be conducted. 相似文献
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