Redescription of Dracovermis occidentalis (Digenea: Liolopidae) infecting American alligator, Alligator mississippiensis from the Bon-Secour River (Mobile–Tensaw River Delta, Alabama, USA) and a revised phylogeny for Liolopidae

IF 1.8 3区 医学 Q2 PARASITOLOGY Parasitology Research Pub Date : 2024-09-19 DOI:10.1007/s00436-024-08339-2
Haley R. Dutton, Stephen A. Bullard, John H. Brule, Anita M. Kelly
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Abstract

We examined several American alligators, Alligator mississippiensis (Daudin, 1802) (Crocodilia: Alligatoridae) from Louisiana, Alabama, and South Carolina in August 2022. The intestine of one alligator from Alabama was infected by Dracovermis occidentalis Brooks and Overstreet, 1978 (Platyhelminthes: Digenea: Liolopidae Odhner, 1912), a seldom collected and incompletely described trematode that lacks a representative nucleotide sequence. Liolopidae comprises 5 genera and 15 species: Liolope spp. infect giant salamanders; Helicotrema spp. infect turtles and lizards; Harmotrema spp. infect snakes; Paraharmotrema spp. infect turtles; and Dracovermis spp. infect crocodilians. Based on our study of the newly collected specimens and the holotype of D. occidentalis, we redescribe D. occidentalis, correct errors in its original description, and provide an updated phylogeny for Liolopidae that, for the first time, includes Dracovermis Brooks and Overstreet, 1978. Our specimens were identified as D. occidentalis by having testes in the posterior 1/3 of the body, a pretesticular cirrus sac, a spined and eversible cirrus, a bipartite seminal vesicle, and a post-acetabular vitellarium. A phylogenetic analysis of the D1–D3 domains of the nuclear large subunit ribosomal DNA (28S) recovered Liolopidae as monophyletic; however, low taxon sampling in the group precludes hypothesis-testing about liolopid-vertebrate cophyly. This is the first collection for morphological study of the type species for Dracovermis since the genus was proposed 46 years ago, the first record of a liolopid from Alabama, and the first phylogenetic analysis that includes Dracovermis.

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重新描述感染Bon-Secour河(美国阿拉巴马州莫比尔-坦索河三角洲)密西西比短吻鳄的Dracovermis occidentalis(Digenea: Liolopidae),并修订Liolopidae的系统发育关系
2022年8月,我们对路易斯安那州、阿拉巴马州和南卡罗来纳州的几条美洲短吻鳄(Alligator mississippiensis (Daudin, 1802))(鳄鱼目:鳄鱼科)进行了检查。来自阿拉巴马州的一条短吻鳄的肠道受到了Dracovermis occidentalis Brooks and Overstreet, 1978(扁形动物:Digenea: Liolopidae Odhner, 1912)的感染,这是一种很少被采集、描述不完整、缺乏代表性核苷酸序列的吸虫。Liolopidae 包括 5 属 15 种:Liolope 属感染大鲵;Helicotrema 属感染龟和蜥蜴;Harmotrema 属感染蛇;Paraharmotrema 属感染龟;Dracovermis 属感染鳄鱼。根据我们对新采集的标本和 D. occidentalis 主模式的研究,我们重新描述了 D. occidentalis,纠正了其原始描述中的错误,并提供了最新的 Liolopidae 系统发育,其中首次包括了 Dracovermis Brooks and Overstreet, 1978。我们的标本通过睾丸位于身体的后 1/3、睾丸前的卷须囊、有棘且可倒转的卷须、双分隔的精囊和髋臼后的玻璃体被鉴定为西氏栉水母(D. occidentalis)。对核大亚基核糖体 DNA(28S)D1-D3 域的系统发生分析表明,犁头鱼科为单系;然而,由于该类群的分类群取样较少,因此无法对犁头鱼科与无脊椎动物的共生关系进行假设检验。这是自 46 年前提出 Dracovermis 属以来首次采集该属的模式种进行形态学研究,也是首次记录来自阿拉巴马州的桡足类,同时也是首次包括 Dracovermis 在内的系统发生学分析。
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来源期刊
Parasitology Research
Parasitology Research 医学-寄生虫学
CiteScore
4.10
自引率
5.00%
发文量
346
审稿时长
6 months
期刊介绍: The journal Parasitology Research covers the latest developments in parasitology across a variety of disciplines, including biology, medicine and veterinary medicine. Among many topics discussed are chemotherapy and control of parasitic disease, and the relationship of host and parasite. Other coverage includes: Protozoology, Helminthology, Entomology; Morphology (incl. Pathomorphology, Ultrastructure); Biochemistry, Physiology including Pathophysiology; Parasite-Host-Relationships including Immunology and Host Specificity; life history, ecology and epidemiology; and Diagnosis, Chemotherapy and Control of Parasitic Diseases.
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