McAllister Chris T, Leis Eric M, Cloutman Donald G, Camus Alvin C, Arroyo-Torres Irvin, Gretebeck Lana, Rodriguez Michael R, Robison Henry W
Division of Natural Sciences, Northeast Texas Community College, Mt. Pleasant, TX, 75455, USA.
La Crosse Fish Health Center-Midwest Fisheries Center, U. S. Fish and Wildlife Service, Onalaska, WI, 54650, USA.
Syst Parasitol. 2024 Dec 3;102(1):9. doi: 10.1007/s11230-024-10208-6.
Forty-two species of myxozoans, including 31 species of Myxobolus Bütschli, 1882, have been described from centrarchid fishes. One species, the green sunfish (Lepomis cyanellus), has been reported to host at least three species of Myxobolus. Between March 2023 and June 2024, 42 L. cyanellus were collected from watersheds in Montgomery and Polk counties, Arkansas, and their gills, gallbladders, urinary bladders, fins, integument, other major organs, and musculature were examined for myxozoans. Two (5%) L. cyanellus from Polk County were found to harbor a new species of Myxobolus infecting the gill lamellae. A qualitative and quantitative morphological description was based on formalin-fixed preserved plasmodia and myxospores. Plasmodia of Myxobolus polkensis n. sp. are 133 µm long × 123 µm wide, and myxospores are 19.8 µm long × 6.5 µm wide, with two narrowly pyriform unequal polar capsules, one usually longer (9.2 µm) than the other (8.5 µm). Molecular data consisted of a 2,025 base pair sequence of the partial small subunit rRNA gene (SSU). Variably sized, polysporic plasmodia were randomly distributed throughout the gill lamellae in intralamellar locations. Large plasmodia displaced adjacent lamellae inducing mild epithelial proliferation but minimal inflammatory changes. Phylogenetic analysis revealed that M. polkensis n. sp. is a member of a clade of myxozoan species that predominately infect centrarchids from North America. This is the fourth report of a Myxobolus from L. cyanellus but the first report of a species infecting the gill lamellae. This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as urn:lsid:zoobank.org:pub:E9BA08E0-0A7E-487B-80AE-C5C723DBB661.
已从鲈形目太阳鱼科鱼类中描述了42种粘孢子虫，其中包括1882年命名的31种粘体虫属（Myxobolus Bütschli）。据报道，一种鱼类——绿太阳鱼（Lepomis cyanellus）体内至少寄生有三种粘体虫属的物种。在2023年3月至2024年6月期间，从阿肯色州蒙哥马利县和波尔克县的流域收集了42条绿太阳鱼，并对它们的鳃、胆囊、膀胱、鳍、体表、其他主要器官和肌肉组织进行了粘孢子虫检查。发现来自波尔克县的两条绿太阳鱼（占5%）体内寄生有一种感染鳃小片的新型粘体虫属物种。基于用福尔马林固定保存的孢质团和粘孢子进行了定性和定量的形态学描述。波尔克粘体虫（Myxobolus polkensis n. sp.）的孢质团长133 µm，宽123 µm，粘孢子长19.8 µm，宽6.5 µm，有两个窄梨形且不等大的极囊，其中一个通常比另一个长（9.2 µm比8.5 µm）。分子数据由部分小亚基核糖体RNA基因（SSU）的2025个碱基对序列组成。大小不一的多孢孢质团随机分布在鳃小片的层内位置。大型孢质团使相邻的鳃小片移位，导致轻度上皮细胞增生，但炎症变化极小。系统发育分析表明，波尔克粘体虫是一个主要感染来自北美的鲈形目太阳鱼科鱼类的粘孢子虫物种分支的成员。这是关于绿太阳鱼体内粘体虫属的第四份报告，但却是关于感染鳃小片的物种的第一份报告。本文已在动物命名法规官方登记册（ZooBank）中注册，登记号为urn:lsid:zoobank.org:pub:E9BA08E0-0A7E-487B-80AE-C5C723DBB661。
