Kentucky Department of Fish and Wildlife Resources, Frankfort KY 40601. .
Eastern Kentucky University, Richmond KY 40475. .
Zootaxa. 2022 Jul 15;5165(3):365-386. doi: 10.11646/zootaxa.5165.3.3.
Variation in morphology of Faxonius jeffersoni has been documented since the 1960s. However, a taxonomic review of the species had not been conducted. In order to clarify if F. jeffersoni exhibited a variety of character traits, or was comprised of multiple taxa, genetic and morphological analyses were conducted. As a result, we revealed that F. jeffersoni sensu lato was comprised of two non-sister taxa. A new species of crayfish, Faxonius elix n. sp., is described herein. Further analysis shows evidence of glacial influence on the distribution of crayfish species of the genus Faxonius throughout Kentucky, Illinois, and Indiana along the glacial maximum.
自 20 世纪 60 年代以来，就有文献记录表明杰斐逊螯虾的形态存在变异。然而，对该物种的分类学研究尚未进行。为了明确杰斐逊螯虾是否表现出多种特征，或者是否由多个分类群组成，我们进行了遗传和形态分析。结果表明，杰斐逊螯虾广义概念包含两个非姐妹分类群。本文描述了一种新的螯虾物种，即伊莱克斯螯虾（Faxonius elix n. sp.）。进一步的分析表明，在冰川最大值时期，冰川对肯塔基州、伊利诺伊州和印第安纳州的费克逊螯虾属的分布有影响。
