During May 2022 and again in March 2023, 5 quillbacks, Carpiodes cyprinus, were collected from the Verdigris River, Wagoner County, Oklahoma (n = 1), and the Black River, Lawrence County, Arkansas (n = 4), and their gill, gallbladder, fins, integument, musculature, and other major organs were macroscopically examined for myxozoans. Gill lamellae from the single quillback from the Verdigris River was infected with a new myxozoan, Thelohanellus oklahomaensis n. sp. Qualitative and quantitative morphological data were obtained from fresh and formalin-fixed preserved myxospores, and molecular data consisted of a 1,767 base pair sequence of the partial small subunit (SSU) ribosomal RNA gene. Phylogenetic analysis grouped T. oklahomaensis n. sp. with myxozoans known to infect North American catostomids and Eurasian cyprinids. Histological examination localized plasmodia to an intralamellar developmental site and revealed a possible vestige of a second polar capsule. Although plasmodia markedly expanded lamellae, there were no associated epithelial or inflammatory changes. Thelohanellus oklahomaensis n. sp. is the only member of the genus known to infect the gills of C. cyprinus.

2022 年 5 月和 2023 年 3 月，从俄克拉荷马州瓦格纳县 Verdigris 河 (n = 1) 和阿肯色州劳伦斯县黑河 (n = 4) 采集了5 只鹅背鸭 ( Carpiodes cyprinus )，并采集了它们的鳃对胆囊、鳍、体皮、肌肉组织和其他主要器官进行宏观检查，以确定是否有粘虫。来自 Verdigris 河的单个鹅背龙的鳃片被一种新的粘虫动物Thelohanellus oklahomaensis n . 感染。 sp。从新鲜和福尔马林固定的保存粘孢子中获得定性和定量形态学数据，分子数据由部分小亚基 ( SSU ) 核糖体 RNA 基因的 1,767 个碱基对序列组成。系统发育分析将T. oklahomaensis n. 分组。 sp。已知感染北美卡口鱼和欧亚鲤科的粘虫。组织学检查将疟原虫定位于板层内发育部位，并揭示了第二极囊的可能痕迹。尽管疟原虫片层明显扩张，但没有相关的上皮或炎症变化。俄克拉荷马州Thelohanellus n. sp。是已知感染鲤鱼鳃的唯一成员。