Epidermal glands in cordylid lizards, with special reference to generation glands

Epidermal glands in cordylid lizards, with special reference to generation glands
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蜥蜴的表皮腺，特别是世代腺

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发表时间：
2010
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通讯作者：
J. H. Wyk
J. H. Wyk
中科院分区：
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文献类型：
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作者：
P. L. F. Mouton;D. V. Rensburg;J. H. Wyk

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我们研究了蜥蜴表皮腺特征的种间和种内变异。我们特别感兴趣的是生殖腺的存在与生活方式之间是否存在因果关系，即在岩石或地面生活的蜥蜴中。我们确定，在成年雄性中，股腺和代腺都存在，但在成年雌性中，根据这些腺体的存在，物种可以分为三类：股腺和代腺都不存在；股腺存在，但无代腺；股腺和代腺都有。雌性的表皮腺的缺失似乎是虫草科的基础条件。就生殖腺数量而言，所有的虫草物种都是两性二态的，雌性的腺体始终少于雄性。女性的腺体数量受气候的强烈影响，在较冷的环境中比在较温暖的环境中要少。在雄性方面，没有明确的地理格局，尽管在一些分支中，高海拔物种的雄性比低海拔物种的雄性有更多的生殖腺。与岩石物种相比，该科5种地栖物种中至少有4种表现出独特的代腺特征，反映了代腺在陆地环境中的持续重要性。
We investigated inter- and intraspecific variation in epidermal gland characteristics in cordylid lizards. Our particular interest was whether a causal relationship exists between the presence of generation glands and lifestyle, i.e. in rock-dwelling or ground-dwelling lizards. We established that both femoral and generation glands are always present in adult males, but that species can be divided into three categories on the basis of the presence of these glands in adult females: both femoral and generation glands absent; femoral glands present, but generation glands absent; and both femoral and generation glands present. The absence of epidermal glands in females appears to be the basal condition in the Cordylidae. All cordylid species are sexually dimorphic as far as generation gland number is concerned, with females having consistently less glands than males. Gland number in females is strongly affected by climate, being lower in cooler compared with warmer environments. In males, there is no clear geographical pattern, although in some clades males of high-altitude species have more generation glands than males of species occurring at lower altitudes. At least four of the five ground-dwelling species in the family display unique generation gland characteristics, compared with rock-dwelling species, reflecting the continued importance of generation glands in terrestrial environments. © 2009 The Linnean Society of London, Zoological Journal of the Linnean Society, 2010, 158, 312–324.