Vea Isabelle M, Siddall Mark E
Richard Gilder Graduate School and the Division of Invertebrate Zoology, American Museum of Natural History, New York, New York 10024, USA.
J Parasitol. 2011 Dec;97(6):1062-6. doi: 10.1645/GE-2850.1. Epub 2011 Jul 25.
Based on scanning electron microscopy and the small subunit ribosomal RNA (SSU rRNA), Haplosporidium tuxtlensis n. sp. (Haplosporidia), a parasite found in the visceral tissues of the false limpet Siphonaria pectinata (Linnaeus, 1758), is described. The spores are ellipsoidal (3.61 ± 0.15 µm × 2.69 ± 0.19 µm), with a circular lid (2.94 ± 0.5 µm) representing the operculum. The spore wall bears filaments occurring singly, or in clusters, of 2 to 8, fusing distally. Phylogenetic relationships of H. tuxtlensis n. sp. were assessed with other described species using the SSU rRNA sequence. Haplosporidium tuxtlensis n. sp. is sister taxon to Haplosporidium pickfordi Barrow, 1961. The morphological characteristics (spore wall structure, shape, size, and filament structure) and the unique host identity corroborate it as a new species. Additionally, this is the first record of Haplosporidia infecting striped false limpets in the Gulf of Mexico.
基于扫描电子显微镜和小亚基核糖体RNA（SSU rRNA），描述了一种在拟帽贝（Siphonaria pectinata，林奈，1758）内脏组织中发现的寄生虫——图斯特勒单孢子虫（Haplosporidium tuxtlensis）新种（单孢子虫目）。孢子呈椭圆形（3.61±0.15微米×2.69±0.19微米），有一个圆形盖子（2.94±0.5微米），即卵盖。孢子壁有单独出现或成簇出现的细丝，每簇2至8根，在远端融合。利用SSU rRNA序列评估了图斯特勒单孢子虫新种与其他已描述物种的系统发育关系。图斯特勒单孢子虫新种是1961年巴罗描述的皮克福德单孢子虫（Haplosporidium pickfordi）的姐妹分类单元。其形态特征（孢子壁结构、形状、大小和细丝结构）以及独特的宿主身份证实它是一个新物种。此外，这是单孢子虫目感染墨西哥湾条纹拟帽贝的首次记录。
