The Sporolithaceae (Corallinales, Rhodophyta) in south-eastern Australia: taxonomy and 18S rRNA phylogeny
The Sporolithaceae (Corallinales, Rhodophyta) in south-eastern Australia: taxonomy and 18S rRNA phylogeny
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澳大利亚东南部的孢子科（珊瑚目、红藻门）：分类学和 18S rRNA 系统发育
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Millar
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作者：
A. Harvey;W. Woelkerling;A. Millar
摘要 孢子科（Corallinales，红藻门）在澳大利亚东南部有两个物种：Heydrichia homalopasta 和 Sporolithon durum。提供形态学和解剖学描述，包括物种索引以及分布、季节性、栖息地和命名法的信息。先前提出的用于划分孢子科内属的性状的分析显示大多数性状状态的相似性、重叠或不确定性。海德里奇亚属中四孢子囊周围有总苞的存在（而孢子石中不存在总苞）已被证明在界定这些属时是有用且稳定的特征。来自澳大利亚东南部 H. homalopasta 收藏品的数据还表明，与四孢子囊区室相关的特征可用于区分 H. homalopasta 与其他海德里希亚种。这些包括存在单独的四孢子囊区室和不存在连续的四孢子囊。来自 S. durum 和 H. homalopasta 的新 18S rRNA 序列数据与选定的已发表的珊瑚红藻序列相结合。所有系统发育重建方法都将 H. homalopasta 和 H. woelkerlingii 解析为强有力支持的进化枝中的兄弟类群。分子数据与已知的形态学数据一致，并且与 H. homalopasta 作为一个独特物种的认识一致。系统发育重建一致地将孢子石和海德里希亚属物种置于与Rhodogorgon carriebowensis（通常被认为属于一个单独的目（Rhodogorgonales））的强烈支持的进化枝中。该结果与已知的形态和生殖特征不一致。
Abstract The family Sporolithaceae (Corallinales, Rhodophyta) is represented in south-eastern Australia by two species: Heydrichia homalopasta and Sporolithon durum. Morphological and anatomical accounts are provided, including a key to species, and information on distribution, seasonality, habitat and nomenclature. Analyses of characters previously proposed for the delimitation of genera within the Sporolithaceae show similarities, overlaps or uncertainties for most character states. The presence of an involucre surrounding the tetrasporangial compartments in Heydrichia (and the absence of an involucre in Sporolithon) has proven a useful and stable character in delimiting these genera. Data from south-eastern Australian collections of H. homalopasta have also shown that features relating to tetrasporangial compartments are useful in delimiting H. homalopasta from other species of Heydrichia. These include the presence of solitary tetrasporangial compartments and the absence of successive tetrasporangia. New 18S rRNA sequence data from S. durum and H. homalopasta were combined with selected published sequences of coralline red algae. All phylogenetic reconstruction methods resolved H. homalopasta and H. woelkerlingii as sibling taxa in a strongly supported clade. Molecular data are consistent with the known morphological data and with recognition of H. homalopasta as a distinct species. Phylogenetic reconstructions consistently placed Sporolithon and species of Heydrichia in a strongly supported clade with Rhodogorgon carriebowensis, a species generally regarded as belonging to a separate order (Rhodogorgonales). This result is inconsistent with known morphological and reproductive features.