New species and records of Pyrgulopsis (Gastropoda: Hydrobiidae) from the Snake River basin, southeastern Oregon: further delineation of a highly imperiled fauna
New species and records of Pyrgulopsis (Gastropoda: Hydrobiidae) from the Snake River basin, southeastern Oregon: further delineation of a highly imperiled fauna
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俄勒冈州东南部蛇河流域的 Pyrgulopsis（腹足纲：Hydrobiidae）新物种和记录：进一步描述高度濒危的动物群
作者：
R. Hershler;Hsiu
本文基于形态学和分子（mtCOI）证据描述了俄勒冈州东南部的两个新种。Pyrgulopsis fresti n. sp，通常被称为“奥怀希温泉蜗牛”，长期以来被认为是独特的和极度危险的，生活在三叉以上奥怀希河短河段的温泉中。这种蜗牛与其他地区物种的不同之处在于它矮矮的壳；由一个大的，圆盘状的腹侧腺组成的阴茎装饰；没有精囊的；和mtCOI序列。Pyrgulopsis owyheensis n. sp.分布在Owyhee和Malheur河流域的五个不相交的泉水群中，偶尔与P. fresti同属。这种蜗牛与另一种区域同类P. intermedia （Tryon, 1865）非常相似，但更小，并进一步区分为典型的分离的内壳唇，更长更窄的阴茎丝，更远的阴茎腹腺和mtCOI序列。模式居群（Owyhee Spring）与该物种的其他地理亚基存在遗传差异（1.5-1.8%的序列差异），可能应作为单独的保护单位进行管理。提供了新记录，将这一优先保护物种的分布范围扩展到奥威希河下游流域。我们还表明，在各种保护相关出版物和文件中列出的“Malheur springsnail”与P. intermedia相同。该研究为俄勒冈州东南部春螺的保护提供了重要信息，并强调了在该地区进行额外实地调查的必要性。
Here we describe two new species from southeastern Oregon based on morphologic and molecular (mtCOI) evidence. Pyrgulopsis fresti n. sp., commonly known as the “Owyhee hot springsnail” and long considered to be distinct and critically imperiled, lives in thermal springs along a short reach of the Owyhee River above Three Forks. This snail differs from other regional species in its squat shell; penial ornament consisting of a large, disc-shaped ventral gland; absence of a seminal receptacle; and mtCOI sequences. Pyrgulopsis owyheensis n. sp. ranges among five disjunct groups of springs in the Owyhee and Malheur river drainages and is occasionally sympatric with P. fresti. This snail is closely similar to another regional congener, P. intermedia (Tryon, 1865), but is smaller and further differentiated by its typically disjunct inner shell lip, longer and narrower penial filament, more distally positioned ventral gland of penis, and mtCOI sequences. The type locality (Owyhee Spring) population of P. owyheensis is genetically differentiated from the other geographical subunits of this species (1.5–1.8% sequence divergence) and should perhaps be managed as a separate conservation unit. New records are provided for P. intermedia which extends the range of this conservation priority species into the lower Owyhee River basin. We also show that the “Malheur springsnail,” which has been listed in various conservation-related publications and documents, is the same as P. intermedia. This study provides critical information for the conservation of springsnails in southeastern Oregon and underscores the need for additional field surveys in the region.